This file is indexed.

/usr/lib/python3.5/pathlib.py is in libpython3.5-stdlib 3.5.1-10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
import fnmatch
import functools
import io
import ntpath
import os
import posixpath
import re
import sys
from collections import Sequence
from contextlib import contextmanager
from errno import EINVAL, ENOENT, ENOTDIR
from operator import attrgetter
from stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
from urllib.parse import quote_from_bytes as urlquote_from_bytes


supports_symlinks = True
if os.name == 'nt':
    import nt
    if sys.getwindowsversion()[:2] >= (6, 0):
        from nt import _getfinalpathname
    else:
        supports_symlinks = False
        _getfinalpathname = None
else:
    nt = None


__all__ = [
    "PurePath", "PurePosixPath", "PureWindowsPath",
    "Path", "PosixPath", "WindowsPath",
    ]

#
# Internals
#

def _is_wildcard_pattern(pat):
    # Whether this pattern needs actual matching using fnmatch, or can
    # be looked up directly as a file.
    return "*" in pat or "?" in pat or "[" in pat


class _Flavour(object):
    """A flavour implements a particular (platform-specific) set of path
    semantics."""

    def __init__(self):
        self.join = self.sep.join

    def parse_parts(self, parts):
        parsed = []
        sep = self.sep
        altsep = self.altsep
        drv = root = ''
        it = reversed(parts)
        for part in it:
            if not part:
                continue
            if altsep:
                part = part.replace(altsep, sep)
            drv, root, rel = self.splitroot(part)
            if sep in rel:
                for x in reversed(rel.split(sep)):
                    if x and x != '.':
                        parsed.append(sys.intern(x))
            else:
                if rel and rel != '.':
                    parsed.append(sys.intern(rel))
            if drv or root:
                if not drv:
                    # If no drive is present, try to find one in the previous
                    # parts. This makes the result of parsing e.g.
                    # ("C:", "/", "a") reasonably intuitive.
                    for part in it:
                        if not part:
                            continue
                        if altsep:
                            part = part.replace(altsep, sep)
                        drv = self.splitroot(part)[0]
                        if drv:
                            break
                break
        if drv or root:
            parsed.append(drv + root)
        parsed.reverse()
        return drv, root, parsed

    def join_parsed_parts(self, drv, root, parts, drv2, root2, parts2):
        """
        Join the two paths represented by the respective
        (drive, root, parts) tuples.  Return a new (drive, root, parts) tuple.
        """
        if root2:
            if not drv2 and drv:
                return drv, root2, [drv + root2] + parts2[1:]
        elif drv2:
            if drv2 == drv or self.casefold(drv2) == self.casefold(drv):
                # Same drive => second path is relative to the first
                return drv, root, parts + parts2[1:]
        else:
            # Second path is non-anchored (common case)
            return drv, root, parts + parts2
        return drv2, root2, parts2


class _WindowsFlavour(_Flavour):
    # Reference for Windows paths can be found at
    # http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx

    sep = '\\'
    altsep = '/'
    has_drv = True
    pathmod = ntpath

    is_supported = (os.name == 'nt')

    drive_letters = (
        set(chr(x) for x in range(ord('a'), ord('z') + 1)) |
        set(chr(x) for x in range(ord('A'), ord('Z') + 1))
    )
    ext_namespace_prefix = '\\\\?\\'

    reserved_names = (
        {'CON', 'PRN', 'AUX', 'NUL'} |
        {'COM%d' % i for i in range(1, 10)} |
        {'LPT%d' % i for i in range(1, 10)}
        )

    # Interesting findings about extended paths:
    # - '\\?\c:\a', '//?/c:\a' and '//?/c:/a' are all supported
    #   but '\\?\c:/a' is not
    # - extended paths are always absolute; "relative" extended paths will
    #   fail.

    def splitroot(self, part, sep=sep):
        first = part[0:1]
        second = part[1:2]
        if (second == sep and first == sep):
            # XXX extended paths should also disable the collapsing of "."
            # components (according to MSDN docs).
            prefix, part = self._split_extended_path(part)
            first = part[0:1]
            second = part[1:2]
        else:
            prefix = ''
        third = part[2:3]
        if (second == sep and first == sep and third != sep):
            # is a UNC path:
            # vvvvvvvvvvvvvvvvvvvvv root
            # \\machine\mountpoint\directory\etc\...
            #            directory ^^^^^^^^^^^^^^
            index = part.find(sep, 2)
            if index != -1:
                index2 = part.find(sep, index + 1)
                # a UNC path can't have two slashes in a row
                # (after the initial two)
                if index2 != index + 1:
                    if index2 == -1:
                        index2 = len(part)
                    if prefix:
                        return prefix + part[1:index2], sep, part[index2+1:]
                    else:
                        return part[:index2], sep, part[index2+1:]
        drv = root = ''
        if second == ':' and first in self.drive_letters:
            drv = part[:2]
            part = part[2:]
            first = third
        if first == sep:
            root = first
            part = part.lstrip(sep)
        return prefix + drv, root, part

    def casefold(self, s):
        return s.lower()

    def casefold_parts(self, parts):
        return [p.lower() for p in parts]

    def resolve(self, path):
        s = str(path)
        if not s:
            return os.getcwd()
        if _getfinalpathname is not None:
            return self._ext_to_normal(_getfinalpathname(s))
        # Means fallback on absolute
        return None

    def _split_extended_path(self, s, ext_prefix=ext_namespace_prefix):
        prefix = ''
        if s.startswith(ext_prefix):
            prefix = s[:4]
            s = s[4:]
            if s.startswith('UNC\\'):
                prefix += s[:3]
                s = '\\' + s[3:]
        return prefix, s

    def _ext_to_normal(self, s):
        # Turn back an extended path into a normal DOS-like path
        return self._split_extended_path(s)[1]

    def is_reserved(self, parts):
        # NOTE: the rules for reserved names seem somewhat complicated
        # (e.g. r"..\NUL" is reserved but not r"foo\NUL").
        # We err on the side of caution and return True for paths which are
        # not considered reserved by Windows.
        if not parts:
            return False
        if parts[0].startswith('\\\\'):
            # UNC paths are never reserved
            return False
        return parts[-1].partition('.')[0].upper() in self.reserved_names

    def make_uri(self, path):
        # Under Windows, file URIs use the UTF-8 encoding.
        drive = path.drive
        if len(drive) == 2 and drive[1] == ':':
            # It's a path on a local drive => 'file:///c:/a/b'
            rest = path.as_posix()[2:].lstrip('/')
            return 'file:///%s/%s' % (
                drive, urlquote_from_bytes(rest.encode('utf-8')))
        else:
            # It's a path on a network drive => 'file://host/share/a/b'
            return 'file:' + urlquote_from_bytes(path.as_posix().encode('utf-8'))

    def gethomedir(self, username):
        if 'HOME' in os.environ:
            userhome = os.environ['HOME']
        elif 'USERPROFILE' in os.environ:
            userhome = os.environ['USERPROFILE']
        elif 'HOMEPATH' in os.environ:
            try:
                drv = os.environ['HOMEDRIVE']
            except KeyError:
                drv = ''
            userhome = drv + os.environ['HOMEPATH']
        else:
            raise RuntimeError("Can't determine home directory")

        if username:
            # Try to guess user home directory.  By default all users
            # directories are located in the same place and are named by
            # corresponding usernames.  If current user home directory points
            # to nonstandard place, this guess is likely wrong.
            if os.environ['USERNAME'] != username:
                drv, root, parts = self.parse_parts((userhome,))
                if parts[-1] != os.environ['USERNAME']:
                    raise RuntimeError("Can't determine home directory "
                                       "for %r" % username)
                parts[-1] = username
                if drv or root:
                    userhome = drv + root + self.join(parts[1:])
                else:
                    userhome = self.join(parts)
        return userhome

class _PosixFlavour(_Flavour):
    sep = '/'
    altsep = ''
    has_drv = False
    pathmod = posixpath

    is_supported = (os.name != 'nt')

    def splitroot(self, part, sep=sep):
        if part and part[0] == sep:
            stripped_part = part.lstrip(sep)
            # According to POSIX path resolution:
            # http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_11
            # "A pathname that begins with two successive slashes may be
            # interpreted in an implementation-defined manner, although more
            # than two leading slashes shall be treated as a single slash".
            if len(part) - len(stripped_part) == 2:
                return '', sep * 2, stripped_part
            else:
                return '', sep, stripped_part
        else:
            return '', '', part

    def casefold(self, s):
        return s

    def casefold_parts(self, parts):
        return parts

    def resolve(self, path):
        sep = self.sep
        accessor = path._accessor
        seen = {}
        def _resolve(path, rest):
            if rest.startswith(sep):
                path = ''

            for name in rest.split(sep):
                if not name or name == '.':
                    # current dir
                    continue
                if name == '..':
                    # parent dir
                    path, _, _ = path.rpartition(sep)
                    continue
                newpath = path + sep + name
                if newpath in seen:
                    # Already seen this path
                    path = seen[newpath]
                    if path is not None:
                        # use cached value
                        continue
                    # The symlink is not resolved, so we must have a symlink loop.
                    raise RuntimeError("Symlink loop from %r" % newpath)
                # Resolve the symbolic link
                try:
                    target = accessor.readlink(newpath)
                except OSError as e:
                    if e.errno != EINVAL:
                        raise
                    # Not a symlink
                    path = newpath
                else:
                    seen[newpath] = None # not resolved symlink
                    path = _resolve(path, target)
                    seen[newpath] = path # resolved symlink

            return path
        # NOTE: according to POSIX, getcwd() cannot contain path components
        # which are symlinks.
        base = '' if path.is_absolute() else os.getcwd()
        return _resolve(base, str(path)) or sep

    def is_reserved(self, parts):
        return False

    def make_uri(self, path):
        # We represent the path using the local filesystem encoding,
        # for portability to other applications.
        bpath = bytes(path)
        return 'file://' + urlquote_from_bytes(bpath)

    def gethomedir(self, username):
        if not username:
            try:
                return os.environ['HOME']
            except KeyError:
                import pwd
                return pwd.getpwuid(os.getuid()).pw_dir
        else:
            import pwd
            try:
                return pwd.getpwnam(username).pw_dir
            except KeyError:
                raise RuntimeError("Can't determine home directory "
                                   "for %r" % username)


_windows_flavour = _WindowsFlavour()
_posix_flavour = _PosixFlavour()


class _Accessor:
    """An accessor implements a particular (system-specific or not) way of
    accessing paths on the filesystem."""


class _NormalAccessor(_Accessor):

    def _wrap_strfunc(strfunc):
        @functools.wraps(strfunc)
        def wrapped(pathobj, *args):
            return strfunc(str(pathobj), *args)
        return staticmethod(wrapped)

    def _wrap_binary_strfunc(strfunc):
        @functools.wraps(strfunc)
        def wrapped(pathobjA, pathobjB, *args):
            return strfunc(str(pathobjA), str(pathobjB), *args)
        return staticmethod(wrapped)

    stat = _wrap_strfunc(os.stat)

    lstat = _wrap_strfunc(os.lstat)

    open = _wrap_strfunc(os.open)

    listdir = _wrap_strfunc(os.listdir)

    chmod = _wrap_strfunc(os.chmod)

    if hasattr(os, "lchmod"):
        lchmod = _wrap_strfunc(os.lchmod)
    else:
        def lchmod(self, pathobj, mode):
            raise NotImplementedError("lchmod() not available on this system")

    mkdir = _wrap_strfunc(os.mkdir)

    unlink = _wrap_strfunc(os.unlink)

    rmdir = _wrap_strfunc(os.rmdir)

    rename = _wrap_binary_strfunc(os.rename)

    replace = _wrap_binary_strfunc(os.replace)

    if nt:
        if supports_symlinks:
            symlink = _wrap_binary_strfunc(os.symlink)
        else:
            def symlink(a, b, target_is_directory):
                raise NotImplementedError("symlink() not available on this system")
    else:
        # Under POSIX, os.symlink() takes two args
        @staticmethod
        def symlink(a, b, target_is_directory):
            return os.symlink(str(a), str(b))

    utime = _wrap_strfunc(os.utime)

    # Helper for resolve()
    def readlink(self, path):
        return os.readlink(path)


_normal_accessor = _NormalAccessor()


#
# Globbing helpers
#

@contextmanager
def _cached(func):
    try:
        func.__cached__
        yield func
    except AttributeError:
        cache = {}
        def wrapper(*args):
            try:
                return cache[args]
            except KeyError:
                value = cache[args] = func(*args)
                return value
        wrapper.__cached__ = True
        try:
            yield wrapper
        finally:
            cache.clear()

def _make_selector(pattern_parts):
    pat = pattern_parts[0]
    child_parts = pattern_parts[1:]
    if pat == '**':
        cls = _RecursiveWildcardSelector
    elif '**' in pat:
        raise ValueError("Invalid pattern: '**' can only be an entire path component")
    elif _is_wildcard_pattern(pat):
        cls = _WildcardSelector
    else:
        cls = _PreciseSelector
    return cls(pat, child_parts)

if hasattr(functools, "lru_cache"):
    _make_selector = functools.lru_cache()(_make_selector)


class _Selector:
    """A selector matches a specific glob pattern part against the children
    of a given path."""

    def __init__(self, child_parts):
        self.child_parts = child_parts
        if child_parts:
            self.successor = _make_selector(child_parts)
        else:
            self.successor = _TerminatingSelector()

    def select_from(self, parent_path):
        """Iterate over all child paths of `parent_path` matched by this
        selector.  This can contain parent_path itself."""
        path_cls = type(parent_path)
        is_dir = path_cls.is_dir
        exists = path_cls.exists
        listdir = parent_path._accessor.listdir
        return self._select_from(parent_path, is_dir, exists, listdir)


class _TerminatingSelector:

    def _select_from(self, parent_path, is_dir, exists, listdir):
        yield parent_path


class _PreciseSelector(_Selector):

    def __init__(self, name, child_parts):
        self.name = name
        _Selector.__init__(self, child_parts)

    def _select_from(self, parent_path, is_dir, exists, listdir):
        try:
            if not is_dir(parent_path):
                return
            path = parent_path._make_child_relpath(self.name)
            if exists(path):
                for p in self.successor._select_from(path, is_dir, exists, listdir):
                    yield p
        except PermissionError:
            return


class _WildcardSelector(_Selector):

    def __init__(self, pat, child_parts):
        self.pat = re.compile(fnmatch.translate(pat))
        _Selector.__init__(self, child_parts)

    def _select_from(self, parent_path, is_dir, exists, listdir):
        try:
            if not is_dir(parent_path):
                return
            cf = parent_path._flavour.casefold
            for name in listdir(parent_path):
                casefolded = cf(name)
                if self.pat.match(casefolded):
                    path = parent_path._make_child_relpath(name)
                    for p in self.successor._select_from(path, is_dir, exists, listdir):
                        yield p
        except PermissionError:
            return



class _RecursiveWildcardSelector(_Selector):

    def __init__(self, pat, child_parts):
        _Selector.__init__(self, child_parts)

    def _iterate_directories(self, parent_path, is_dir, listdir):
        yield parent_path
        try:
            for name in listdir(parent_path):
                path = parent_path._make_child_relpath(name)
                if is_dir(path) and not path.is_symlink():
                    for p in self._iterate_directories(path, is_dir, listdir):
                        yield p
        except PermissionError:
            return

    def _select_from(self, parent_path, is_dir, exists, listdir):
        try:
            if not is_dir(parent_path):
                return
            with _cached(listdir) as listdir:
                yielded = set()
                try:
                    successor_select = self.successor._select_from
                    for starting_point in self._iterate_directories(parent_path, is_dir, listdir):
                        for p in successor_select(starting_point, is_dir, exists, listdir):
                            if p not in yielded:
                                yield p
                                yielded.add(p)
                finally:
                    yielded.clear()
        except PermissionError:
            return


#
# Public API
#

class _PathParents(Sequence):
    """This object provides sequence-like access to the logical ancestors
    of a path.  Don't try to construct it yourself."""
    __slots__ = ('_pathcls', '_drv', '_root', '_parts')

    def __init__(self, path):
        # We don't store the instance to avoid reference cycles
        self._pathcls = type(path)
        self._drv = path._drv
        self._root = path._root
        self._parts = path._parts

    def __len__(self):
        if self._drv or self._root:
            return len(self._parts) - 1
        else:
            return len(self._parts)

    def __getitem__(self, idx):
        if idx < 0 or idx >= len(self):
            raise IndexError(idx)
        return self._pathcls._from_parsed_parts(self._drv, self._root,
                                                self._parts[:-idx - 1])

    def __repr__(self):
        return "<{}.parents>".format(self._pathcls.__name__)


class PurePath(object):
    """PurePath represents a filesystem path and offers operations which
    don't imply any actual filesystem I/O.  Depending on your system,
    instantiating a PurePath will return either a PurePosixPath or a
    PureWindowsPath object.  You can also instantiate either of these classes
    directly, regardless of your system.
    """
    __slots__ = (
        '_drv', '_root', '_parts',
        '_str', '_hash', '_pparts', '_cached_cparts',
    )

    def __new__(cls, *args):
        """Construct a PurePath from one or several strings and or existing
        PurePath objects.  The strings and path objects are combined so as
        to yield a canonicalized path, which is incorporated into the
        new PurePath object.
        """
        if cls is PurePath:
            cls = PureWindowsPath if os.name == 'nt' else PurePosixPath
        return cls._from_parts(args)

    def __reduce__(self):
        # Using the parts tuple helps share interned path parts
        # when pickling related paths.
        return (self.__class__, tuple(self._parts))

    @classmethod
    def _parse_args(cls, args):
        # This is useful when you don't want to create an instance, just
        # canonicalize some constructor arguments.
        parts = []
        for a in args:
            if isinstance(a, PurePath):
                parts += a._parts
            elif isinstance(a, str):
                # Force-cast str subclasses to str (issue #21127)
                parts.append(str(a))
            else:
                raise TypeError(
                    "argument should be a path or str object, not %r"
                    % type(a))
        return cls._flavour.parse_parts(parts)

    @classmethod
    def _from_parts(cls, args, init=True):
        # We need to call _parse_args on the instance, so as to get the
        # right flavour.
        self = object.__new__(cls)
        drv, root, parts = self._parse_args(args)
        self._drv = drv
        self._root = root
        self._parts = parts
        if init:
            self._init()
        return self

    @classmethod
    def _from_parsed_parts(cls, drv, root, parts, init=True):
        self = object.__new__(cls)
        self._drv = drv
        self._root = root
        self._parts = parts
        if init:
            self._init()
        return self

    @classmethod
    def _format_parsed_parts(cls, drv, root, parts):
        if drv or root:
            return drv + root + cls._flavour.join(parts[1:])
        else:
            return cls._flavour.join(parts)

    def _init(self):
        # Overriden in concrete Path
        pass

    def _make_child(self, args):
        drv, root, parts = self._parse_args(args)
        drv, root, parts = self._flavour.join_parsed_parts(
            self._drv, self._root, self._parts, drv, root, parts)
        return self._from_parsed_parts(drv, root, parts)

    def __str__(self):
        """Return the string representation of the path, suitable for
        passing to system calls."""
        try:
            return self._str
        except AttributeError:
            self._str = self._format_parsed_parts(self._drv, self._root,
                                                  self._parts) or '.'
            return self._str

    @property
    def path(self):
        try:
            return self._str
        except AttributeError:
            return str(self)

    def as_posix(self):
        """Return the string representation of the path with forward (/)
        slashes."""
        f = self._flavour
        return str(self).replace(f.sep, '/')

    def __bytes__(self):
        """Return the bytes representation of the path.  This is only
        recommended to use under Unix."""
        return os.fsencode(str(self))

    def __repr__(self):
        return "{}({!r})".format(self.__class__.__name__, self.as_posix())

    def as_uri(self):
        """Return the path as a 'file' URI."""
        if not self.is_absolute():
            raise ValueError("relative path can't be expressed as a file URI")
        return self._flavour.make_uri(self)

    @property
    def _cparts(self):
        # Cached casefolded parts, for hashing and comparison
        try:
            return self._cached_cparts
        except AttributeError:
            self._cached_cparts = self._flavour.casefold_parts(self._parts)
            return self._cached_cparts

    def __eq__(self, other):
        if not isinstance(other, PurePath):
            return NotImplemented
        return self._cparts == other._cparts and self._flavour is other._flavour

    def __hash__(self):
        try:
            return self._hash
        except AttributeError:
            self._hash = hash(tuple(self._cparts))
            return self._hash

    def __lt__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        return self._cparts < other._cparts

    def __le__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        return self._cparts <= other._cparts

    def __gt__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        return self._cparts > other._cparts

    def __ge__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        return self._cparts >= other._cparts

    drive = property(attrgetter('_drv'),
                     doc="""The drive prefix (letter or UNC path), if any.""")

    root = property(attrgetter('_root'),
                    doc="""The root of the path, if any.""")

    @property
    def anchor(self):
        """The concatenation of the drive and root, or ''."""
        anchor = self._drv + self._root
        return anchor

    @property
    def name(self):
        """The final path component, if any."""
        parts = self._parts
        if len(parts) == (1 if (self._drv or self._root) else 0):
            return ''
        return parts[-1]

    @property
    def suffix(self):
        """The final component's last suffix, if any."""
        name = self.name
        i = name.rfind('.')
        if 0 < i < len(name) - 1:
            return name[i:]
        else:
            return ''

    @property
    def suffixes(self):
        """A list of the final component's suffixes, if any."""
        name = self.name
        if name.endswith('.'):
            return []
        name = name.lstrip('.')
        return ['.' + suffix for suffix in name.split('.')[1:]]

    @property
    def stem(self):
        """The final path component, minus its last suffix."""
        name = self.name
        i = name.rfind('.')
        if 0 < i < len(name) - 1:
            return name[:i]
        else:
            return name

    def with_name(self, name):
        """Return a new path with the file name changed."""
        if not self.name:
            raise ValueError("%r has an empty name" % (self,))
        drv, root, parts = self._flavour.parse_parts((name,))
        if (not name or name[-1] in [self._flavour.sep, self._flavour.altsep]
            or drv or root or len(parts) != 1):
            raise ValueError("Invalid name %r" % (name))
        return self._from_parsed_parts(self._drv, self._root,
                                       self._parts[:-1] + [name])

    def with_suffix(self, suffix):
        """Return a new path with the file suffix changed (or added, if none)."""
        # XXX if suffix is None, should the current suffix be removed?
        f = self._flavour
        if f.sep in suffix or f.altsep and f.altsep in suffix:
            raise ValueError("Invalid suffix %r" % (suffix))
        if suffix and not suffix.startswith('.') or suffix == '.':
            raise ValueError("Invalid suffix %r" % (suffix))
        name = self.name
        if not name:
            raise ValueError("%r has an empty name" % (self,))
        old_suffix = self.suffix
        if not old_suffix:
            name = name + suffix
        else:
            name = name[:-len(old_suffix)] + suffix
        return self._from_parsed_parts(self._drv, self._root,
                                       self._parts[:-1] + [name])

    def relative_to(self, *other):
        """Return the relative path to another path identified by the passed
        arguments.  If the operation is not possible (because this is not
        a subpath of the other path), raise ValueError.
        """
        # For the purpose of this method, drive and root are considered
        # separate parts, i.e.:
        #   Path('c:/').relative_to('c:')  gives Path('/')
        #   Path('c:/').relative_to('/')   raise ValueError
        if not other:
            raise TypeError("need at least one argument")
        parts = self._parts
        drv = self._drv
        root = self._root
        if root:
            abs_parts = [drv, root] + parts[1:]
        else:
            abs_parts = parts
        to_drv, to_root, to_parts = self._parse_args(other)
        if to_root:
            to_abs_parts = [to_drv, to_root] + to_parts[1:]
        else:
            to_abs_parts = to_parts
        n = len(to_abs_parts)
        cf = self._flavour.casefold_parts
        if (root or drv) if n == 0 else cf(abs_parts[:n]) != cf(to_abs_parts):
            formatted = self._format_parsed_parts(to_drv, to_root, to_parts)
            raise ValueError("{!r} does not start with {!r}"
                             .format(str(self), str(formatted)))
        return self._from_parsed_parts('', root if n == 1 else '',
                                       abs_parts[n:])

    @property
    def parts(self):
        """An object providing sequence-like access to the
        components in the filesystem path."""
        # We cache the tuple to avoid building a new one each time .parts
        # is accessed.  XXX is this necessary?
        try:
            return self._pparts
        except AttributeError:
            self._pparts = tuple(self._parts)
            return self._pparts

    def joinpath(self, *args):
        """Combine this path with one or several arguments, and return a
        new path representing either a subpath (if all arguments are relative
        paths) or a totally different path (if one of the arguments is
        anchored).
        """
        return self._make_child(args)

    def __truediv__(self, key):
        return self._make_child((key,))

    def __rtruediv__(self, key):
        return self._from_parts([key] + self._parts)

    @property
    def parent(self):
        """The logical parent of the path."""
        drv = self._drv
        root = self._root
        parts = self._parts
        if len(parts) == 1 and (drv or root):
            return self
        return self._from_parsed_parts(drv, root, parts[:-1])

    @property
    def parents(self):
        """A sequence of this path's logical parents."""
        return _PathParents(self)

    def is_absolute(self):
        """True if the path is absolute (has both a root and, if applicable,
        a drive)."""
        if not self._root:
            return False
        return not self._flavour.has_drv or bool(self._drv)

    def is_reserved(self):
        """Return True if the path contains one of the special names reserved
        by the system, if any."""
        return self._flavour.is_reserved(self._parts)

    def match(self, path_pattern):
        """
        Return True if this path matches the given pattern.
        """
        cf = self._flavour.casefold
        path_pattern = cf(path_pattern)
        drv, root, pat_parts = self._flavour.parse_parts((path_pattern,))
        if not pat_parts:
            raise ValueError("empty pattern")
        if drv and drv != cf(self._drv):
            return False
        if root and root != cf(self._root):
            return False
        parts = self._cparts
        if drv or root:
            if len(pat_parts) != len(parts):
                return False
            pat_parts = pat_parts[1:]
        elif len(pat_parts) > len(parts):
            return False
        for part, pat in zip(reversed(parts), reversed(pat_parts)):
            if not fnmatch.fnmatchcase(part, pat):
                return False
        return True


class PurePosixPath(PurePath):
    _flavour = _posix_flavour
    __slots__ = ()


class PureWindowsPath(PurePath):
    _flavour = _windows_flavour
    __slots__ = ()


# Filesystem-accessing classes


class Path(PurePath):
    __slots__ = (
        '_accessor',
        '_closed',
    )

    def __new__(cls, *args, **kwargs):
        if cls is Path:
            cls = WindowsPath if os.name == 'nt' else PosixPath
        self = cls._from_parts(args, init=False)
        if not self._flavour.is_supported:
            raise NotImplementedError("cannot instantiate %r on your system"
                                      % (cls.__name__,))
        self._init()
        return self

    def _init(self,
              # Private non-constructor arguments
              template=None,
              ):
        self._closed = False
        if template is not None:
            self._accessor = template._accessor
        else:
            self._accessor = _normal_accessor

    def _make_child_relpath(self, part):
        # This is an optimization used for dir walking.  `part` must be
        # a single part relative to this path.
        parts = self._parts + [part]
        return self._from_parsed_parts(self._drv, self._root, parts)

    def __enter__(self):
        if self._closed:
            self._raise_closed()
        return self

    def __exit__(self, t, v, tb):
        self._closed = True

    def _raise_closed(self):
        raise ValueError("I/O operation on closed path")

    def _opener(self, name, flags, mode=0o666):
        # A stub for the opener argument to built-in open()
        return self._accessor.open(self, flags, mode)

    def _raw_open(self, flags, mode=0o777):
        """
        Open the file pointed by this path and return a file descriptor,
        as os.open() does.
        """
        if self._closed:
            self._raise_closed()
        return self._accessor.open(self, flags, mode)

    # Public API

    @classmethod
    def cwd(cls):
        """Return a new path pointing to the current working directory
        (as returned by os.getcwd()).
        """
        return cls(os.getcwd())

    @classmethod
    def home(cls):
        """Return a new path pointing to the user's home directory (as
        returned by os.path.expanduser('~')).
        """
        return cls(cls()._flavour.gethomedir(None))

    def samefile(self, other_path):
        """Return whether other_path is the same or not as this file
        (as returned by os.path.samefile()).
        """
        st = self.stat()
        try:
            other_st = other_path.stat()
        except AttributeError:
            other_st = os.stat(other_path)
        return os.path.samestat(st, other_st)

    def iterdir(self):
        """Iterate over the files in this directory.  Does not yield any
        result for the special paths '.' and '..'.
        """
        if self._closed:
            self._raise_closed()
        for name in self._accessor.listdir(self):
            if name in {'.', '..'}:
                # Yielding a path object for these makes little sense
                continue
            yield self._make_child_relpath(name)
            if self._closed:
                self._raise_closed()

    def glob(self, pattern):
        """Iterate over this subtree and yield all existing files (of any
        kind, including directories) matching the given pattern.
        """
        if not pattern:
            raise ValueError("Unacceptable pattern: {!r}".format(pattern))
        pattern = self._flavour.casefold(pattern)
        drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
        if drv or root:
            raise NotImplementedError("Non-relative patterns are unsupported")
        selector = _make_selector(tuple(pattern_parts))
        for p in selector.select_from(self):
            yield p

    def rglob(self, pattern):
        """Recursively yield all existing files (of any kind, including
        directories) matching the given pattern, anywhere in this subtree.
        """
        pattern = self._flavour.casefold(pattern)
        drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
        if drv or root:
            raise NotImplementedError("Non-relative patterns are unsupported")
        selector = _make_selector(("**",) + tuple(pattern_parts))
        for p in selector.select_from(self):
            yield p

    def absolute(self):
        """Return an absolute version of this path.  This function works
        even if the path doesn't point to anything.

        No normalization is done, i.e. all '.' and '..' will be kept along.
        Use resolve() to get the canonical path to a file.
        """
        # XXX untested yet!
        if self._closed:
            self._raise_closed()
        if self.is_absolute():
            return self
        # FIXME this must defer to the specific flavour (and, under Windows,
        # use nt._getfullpathname())
        obj = self._from_parts([os.getcwd()] + self._parts, init=False)
        obj._init(template=self)
        return obj

    def resolve(self):
        """
        Make the path absolute, resolving all symlinks on the way and also
        normalizing it (for example turning slashes into backslashes under
        Windows).
        """
        if self._closed:
            self._raise_closed()
        s = self._flavour.resolve(self)
        if s is None:
            # No symlink resolution => for consistency, raise an error if
            # the path doesn't exist or is forbidden
            self.stat()
            s = str(self.absolute())
        # Now we have no symlinks in the path, it's safe to normalize it.
        normed = self._flavour.pathmod.normpath(s)
        obj = self._from_parts((normed,), init=False)
        obj._init(template=self)
        return obj

    def stat(self):
        """
        Return the result of the stat() system call on this path, like
        os.stat() does.
        """
        return self._accessor.stat(self)

    def owner(self):
        """
        Return the login name of the file owner.
        """
        import pwd
        return pwd.getpwuid(self.stat().st_uid).pw_name

    def group(self):
        """
        Return the group name of the file gid.
        """
        import grp
        return grp.getgrgid(self.stat().st_gid).gr_name

    def open(self, mode='r', buffering=-1, encoding=None,
             errors=None, newline=None):
        """
        Open the file pointed by this path and return a file object, as
        the built-in open() function does.
        """
        if self._closed:
            self._raise_closed()
        return io.open(str(self), mode, buffering, encoding, errors, newline,
                       opener=self._opener)

    def read_bytes(self):
        """
        Open the file in bytes mode, read it, and close the file.
        """
        with self.open(mode='rb') as f:
            return f.read()

    def read_text(self, encoding=None, errors=None):
        """
        Open the file in text mode, read it, and close the file.
        """
        with self.open(mode='r', encoding=encoding, errors=errors) as f:
            return f.read()

    def write_bytes(self, data):
        """
        Open the file in bytes mode, write to it, and close the file.
        """
        # type-check for the buffer interface before truncating the file
        view = memoryview(data)
        with self.open(mode='wb') as f:
            return f.write(view)

    def write_text(self, data, encoding=None, errors=None):
        """
        Open the file in text mode, write to it, and close the file.
        """
        if not isinstance(data, str):
            raise TypeError('data must be str, not %s' %
                            data.__class__.__name__)
        with self.open(mode='w', encoding=encoding, errors=errors) as f:
            return f.write(data)

    def touch(self, mode=0o666, exist_ok=True):
        """
        Create this file with the given access mode, if it doesn't exist.
        """
        if self._closed:
            self._raise_closed()
        if exist_ok:
            # First try to bump modification time
            # Implementation note: GNU touch uses the UTIME_NOW option of
            # the utimensat() / futimens() functions.
            try:
                self._accessor.utime(self, None)
            except OSError:
                # Avoid exception chaining
                pass
            else:
                return
        flags = os.O_CREAT | os.O_WRONLY
        if not exist_ok:
            flags |= os.O_EXCL
        fd = self._raw_open(flags, mode)
        os.close(fd)

    def mkdir(self, mode=0o777, parents=False, exist_ok=False):
        if self._closed:
            self._raise_closed()
        if not parents:
            try:
                self._accessor.mkdir(self, mode)
            except FileExistsError:
                if not exist_ok or not self.is_dir():
                    raise
        else:
            try:
                self._accessor.mkdir(self, mode)
            except FileExistsError:
                if not exist_ok or not self.is_dir():
                    raise
            except OSError as e:
                if e.errno != ENOENT:
                    raise
                self.parent.mkdir(parents=True)
                self._accessor.mkdir(self, mode)

    def chmod(self, mode):
        """
        Change the permissions of the path, like os.chmod().
        """
        if self._closed:
            self._raise_closed()
        self._accessor.chmod(self, mode)

    def lchmod(self, mode):
        """
        Like chmod(), except if the path points to a symlink, the symlink's
        permissions are changed, rather than its target's.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.lchmod(self, mode)

    def unlink(self):
        """
        Remove this file or link.
        If the path is a directory, use rmdir() instead.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.unlink(self)

    def rmdir(self):
        """
        Remove this directory.  The directory must be empty.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.rmdir(self)

    def lstat(self):
        """
        Like stat(), except if the path points to a symlink, the symlink's
        status information is returned, rather than its target's.
        """
        if self._closed:
            self._raise_closed()
        return self._accessor.lstat(self)

    def rename(self, target):
        """
        Rename this path to the given path.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.rename(self, target)

    def replace(self, target):
        """
        Rename this path to the given path, clobbering the existing
        destination if it exists.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.replace(self, target)

    def symlink_to(self, target, target_is_directory=False):
        """
        Make this path a symlink pointing to the given path.
        Note the order of arguments (self, target) is the reverse of os.symlink's.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.symlink(target, self, target_is_directory)

    # Convenience functions for querying the stat results

    def exists(self):
        """
        Whether this path exists.
        """
        try:
            self.stat()
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False
        return True

    def is_dir(self):
        """
        Whether this path is a directory.
        """
        try:
            return S_ISDIR(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            # Path doesn't exist or is a broken symlink
            # (see https://bitbucket.org/pitrou/pathlib/issue/12/)
            return False

    def is_file(self):
        """
        Whether this path is a regular file (also True for symlinks pointing
        to regular files).
        """
        try:
            return S_ISREG(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            # Path doesn't exist or is a broken symlink
            # (see https://bitbucket.org/pitrou/pathlib/issue/12/)
            return False

    def is_symlink(self):
        """
        Whether this path is a symbolic link.
        """
        try:
            return S_ISLNK(self.lstat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            # Path doesn't exist
            return False

    def is_block_device(self):
        """
        Whether this path is a block device.
        """
        try:
            return S_ISBLK(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            # Path doesn't exist or is a broken symlink
            # (see https://bitbucket.org/pitrou/pathlib/issue/12/)
            return False

    def is_char_device(self):
        """
        Whether this path is a character device.
        """
        try:
            return S_ISCHR(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            # Path doesn't exist or is a broken symlink
            # (see https://bitbucket.org/pitrou/pathlib/issue/12/)
            return False

    def is_fifo(self):
        """
        Whether this path is a FIFO.
        """
        try:
            return S_ISFIFO(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            # Path doesn't exist or is a broken symlink
            # (see https://bitbucket.org/pitrou/pathlib/issue/12/)
            return False

    def is_socket(self):
        """
        Whether this path is a socket.
        """
        try:
            return S_ISSOCK(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            # Path doesn't exist or is a broken symlink
            # (see https://bitbucket.org/pitrou/pathlib/issue/12/)
            return False

    def expanduser(self):
        """ Return a new path with expanded ~ and ~user constructs
        (as returned by os.path.expanduser)
        """
        if (not (self._drv or self._root) and
            self._parts and self._parts[0][:1] == '~'):
            homedir = self._flavour.gethomedir(self._parts[0][1:])
            return self._from_parts([homedir] + self._parts[1:])

        return self


class PosixPath(Path, PurePosixPath):
    __slots__ = ()

class WindowsPath(Path, PureWindowsPath):
    __slots__ = ()

    def owner(self):
        raise NotImplementedError("Path.owner() is unsupported on this system")

    def group(self):
        raise NotImplementedError("Path.group() is unsupported on this system")