/usr/lib/python2.7/dist-packages/logilab/common/compat.py is in python-logilab-common 0.62.0-1.
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of logilab-common.
#
# logilab-common is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option) any
# later version.
#
# logilab-common is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with logilab-common. If not, see <http://www.gnu.org/licenses/>.
"""Wrappers around some builtins introduced in python 2.3, 2.4 and
2.5, making them available in for earlier versions of python.
See another compatibility snippets from other projects:
:mod:`lib2to3.fixes`
:mod:`coverage.backward`
:mod:`unittest2.compatibility`
"""
from __future__ import generators
__docformat__ = "restructuredtext en"
import os
import sys
import types
from warnings import warn
import __builtin__ as builtins # 2to3 will tranform '__builtin__' to 'builtins'
if sys.version_info < (3, 0):
str_to_bytes = str
def str_encode(string, encoding):
if isinstance(string, unicode):
return string.encode(encoding)
return str(string)
else:
def str_to_bytes(string):
return str.encode(string)
# we have to ignore the encoding in py3k to be able to write a string into a
# TextIOWrapper or like object (which expect an unicode string)
def str_encode(string, encoding):
return str(string)
# XXX callable built-in seems back in all python versions
try:
callable = builtins.callable
except AttributeError:
from collections import Callable
def callable(something):
return isinstance(something, Callable)
del Callable
# See also http://bugs.python.org/issue11776
if sys.version_info[0] == 3:
def method_type(callable, instance, klass):
# api change. klass is no more considered
return types.MethodType(callable, instance)
else:
# alias types otherwise
method_type = types.MethodType
if sys.version_info < (3, 0):
raw_input = raw_input
else:
raw_input = input
# Pythons 2 and 3 differ on where to get StringIO
if sys.version_info < (3, 0):
from cStringIO import StringIO
FileIO = file
BytesIO = StringIO
reload = reload
else:
from io import FileIO, BytesIO, StringIO
from imp import reload
# Where do pickles come from?
try:
import cPickle as pickle
except ImportError:
import pickle
from logilab.common.deprecation import deprecated
from itertools import izip, chain, imap
if sys.version_info < (3, 0):# 2to3 will remove the imports
izip = deprecated('izip exists in itertools since py2.3')(izip)
imap = deprecated('imap exists in itertools since py2.3')(imap)
chain = deprecated('chain exists in itertools since py2.3')(chain)
sum = deprecated('sum exists in builtins since py2.3')(sum)
enumerate = deprecated('enumerate exists in builtins since py2.3')(enumerate)
frozenset = deprecated('frozenset exists in builtins since py2.4')(frozenset)
reversed = deprecated('reversed exists in builtins since py2.4')(reversed)
sorted = deprecated('sorted exists in builtins since py2.4')(sorted)
max = deprecated('max exists in builtins since py2.4')(max)
# Python2.5 builtins
try:
any = any
all = all
except NameError:
def any(iterable):
"""any(iterable) -> bool
Return True if bool(x) is True for any x in the iterable.
"""
for elt in iterable:
if elt:
return True
return False
def all(iterable):
"""all(iterable) -> bool
Return True if bool(x) is True for all values x in the iterable.
"""
for elt in iterable:
if not elt:
return False
return True
# Python2.5 subprocess added functions and exceptions
try:
from subprocess import Popen
except ImportError:
# gae or python < 2.3
class CalledProcessError(Exception):
"""This exception is raised when a process run by check_call() returns
a non-zero exit status. The exit status will be stored in the
returncode attribute."""
def __init__(self, returncode, cmd):
self.returncode = returncode
self.cmd = cmd
def __str__(self):
return "Command '%s' returned non-zero exit status %d" % (self.cmd,
self.returncode)
def call(*popenargs, **kwargs):
"""Run command with arguments. Wait for command to complete, then
return the returncode attribute.
The arguments are the same as for the Popen constructor. Example:
retcode = call(["ls", "-l"])
"""
# workaround: subprocess.Popen(cmd, stdout=sys.stdout) fails
# see http://bugs.python.org/issue1531862
if "stdout" in kwargs:
fileno = kwargs.get("stdout").fileno()
del kwargs['stdout']
return Popen(stdout=os.dup(fileno), *popenargs, **kwargs).wait()
return Popen(*popenargs, **kwargs).wait()
def check_call(*popenargs, **kwargs):
"""Run command with arguments. Wait for command to complete. If
the exit code was zero then return, otherwise raise
CalledProcessError. The CalledProcessError object will have the
return code in the returncode attribute.
The arguments are the same as for the Popen constructor. Example:
check_call(["ls", "-l"])
"""
retcode = call(*popenargs, **kwargs)
cmd = kwargs.get("args")
if cmd is None:
cmd = popenargs[0]
if retcode:
raise CalledProcessError(retcode, cmd)
return retcode
try:
from os.path import relpath
except ImportError: # python < 2.6
from os.path import curdir, abspath, sep, commonprefix, pardir, join
def relpath(path, start=curdir):
"""Return a relative version of a path"""
if not path:
raise ValueError("no path specified")
start_list = abspath(start).split(sep)
path_list = abspath(path).split(sep)
# Work out how much of the filepath is shared by start and path.
i = len(commonprefix([start_list, path_list]))
rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
if not rel_list:
return curdir
return join(*rel_list)
# XXX don't know why tests don't pass if I don't do that :
_real_set, set = set, deprecated('set exists in builtins since py2.4')(set)
if (2, 5) <= sys.version_info[:2]:
InheritableSet = _real_set
else:
class InheritableSet(_real_set):
"""hacked resolving inheritancy issue from old style class in 2.4"""
def __new__(cls, *args, **kwargs):
if args:
new_args = (args[0], )
else:
new_args = ()
obj = _real_set.__new__(cls, *new_args)
obj.__init__(*args, **kwargs)
return obj
# XXX shouldn't we remove this and just let 2to3 do his job ?
# range or xrange?
try:
range = xrange
except NameError:
range = range
# ConfigParser was renamed to the more-standard configparser
try:
import configparser
except ImportError:
import ConfigParser as configparser
try:
import json
except ImportError:
try:
import simplejson as json
except ImportError:
json = None
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