/usr/lib/python3/dist-packages/iso8601/iso8601.py is in python3-iso8601 0.1.11-1.
This file is owned by root:root, with mode 0o644.
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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 | """ISO 8601 date time string parsing
Basic usage:
>>> import iso8601
>>> iso8601.parse_date("2007-01-25T12:00:00Z")
datetime.datetime(2007, 1, 25, 12, 0, tzinfo=<iso8601.iso8601.Utc ...>)
>>>
"""
from datetime import (
datetime,
timedelta,
tzinfo
)
from decimal import Decimal
import sys
import re
__all__ = ["parse_date", "ParseError", "UTC"]
if sys.version_info >= (3, 0, 0):
_basestring = str
else:
_basestring = basestring
# Adapted from http://delete.me.uk/2005/03/iso8601.html
ISO8601_REGEX = re.compile(
r"""
(?P<year>[0-9]{4})
(
(
(-(?P<monthdash>[0-9]{1,2}))
|
(?P<month>[0-9]{2})
(?!$) # Don't allow YYYYMM
)
(
(
(-(?P<daydash>[0-9]{1,2}))
|
(?P<day>[0-9]{2})
)
(
(
(?P<separator>[ T])
(?P<hour>[0-9]{2})
(:{0,1}(?P<minute>[0-9]{2})){0,1}
(
:{0,1}(?P<second>[0-9]{1,2})
([.,](?P<second_fraction>[0-9]+)){0,1}
){0,1}
(?P<timezone>
Z
|
(
(?P<tz_sign>[-+])
(?P<tz_hour>[0-9]{2})
:{0,1}
(?P<tz_minute>[0-9]{2}){0,1}
)
){0,1}
){0,1}
)
){0,1} # YYYY-MM
){0,1} # YYYY only
$
""",
re.VERBOSE
)
class ParseError(Exception):
"""Raised when there is a problem parsing a date string"""
# Yoinked from python docs
ZERO = timedelta(0)
class Utc(tzinfo):
"""UTC Timezone
"""
def utcoffset(self, dt):
return ZERO
def tzname(self, dt):
return "UTC"
def dst(self, dt):
return ZERO
def __repr__(self):
return "<iso8601.Utc>"
UTC = Utc()
class FixedOffset(tzinfo):
"""Fixed offset in hours and minutes from UTC
"""
def __init__(self, offset_hours, offset_minutes, name):
self.__offset_hours = offset_hours # Keep for later __getinitargs__
self.__offset_minutes = offset_minutes # Keep for later __getinitargs__
self.__offset = timedelta(hours=offset_hours, minutes=offset_minutes)
self.__name = name
def __eq__(self, other):
if isinstance(other, FixedOffset):
return (
(other.__offset == self.__offset)
and
(other.__name == self.__name)
)
if isinstance(other, tzinfo):
return other == self
return False
def __getinitargs__(self):
return (self.__offset_hours, self.__offset_minutes, self.__name)
def utcoffset(self, dt):
return self.__offset
def tzname(self, dt):
return self.__name
def dst(self, dt):
return ZERO
def __repr__(self):
return "<FixedOffset %r %r>" % (self.__name, self.__offset)
def to_int(d, key, default_to_zero=False, default=None, required=True):
"""Pull a value from the dict and convert to int
:param default_to_zero: If the value is None or empty, treat it as zero
:param default: If the value is missing in the dict use this default
"""
value = d.get(key) or default
if (value in ["", None]) and default_to_zero:
return 0
if value is None:
if required:
raise ParseError("Unable to read %s from %s" % (key, d))
else:
return int(value)
def parse_timezone(matches, default_timezone=UTC):
"""Parses ISO 8601 time zone specs into tzinfo offsets
"""
if matches["timezone"] == "Z":
return UTC
# This isn't strictly correct, but it's common to encounter dates without
# timezones so I'll assume the default (which defaults to UTC).
# Addresses issue 4.
if matches["timezone"] is None:
return default_timezone
sign = matches["tz_sign"]
hours = to_int(matches, "tz_hour")
minutes = to_int(matches, "tz_minute", default_to_zero=True)
description = "%s%02d:%02d" % (sign, hours, minutes)
if sign == "-":
hours = -hours
minutes = -minutes
return FixedOffset(hours, minutes, description)
def parse_date(datestring, default_timezone=UTC):
"""Parses ISO 8601 dates into datetime objects
The timezone is parsed from the date string. However it is quite common to
have dates without a timezone (not strictly correct). In this case the
default timezone specified in default_timezone is used. This is UTC by
default.
:param datestring: The date to parse as a string
:param default_timezone: A datetime tzinfo instance to use when no timezone
is specified in the datestring. If this is set to
None then a naive datetime object is returned.
:returns: A datetime.datetime instance
:raises: ParseError when there is a problem parsing the date or
constructing the datetime instance.
"""
if not isinstance(datestring, _basestring):
raise ParseError("Expecting a string %r" % datestring)
m = ISO8601_REGEX.match(datestring)
if not m:
raise ParseError("Unable to parse date string %r" % datestring)
groups = m.groupdict()
tz = parse_timezone(groups, default_timezone=default_timezone)
groups["second_fraction"] = int(Decimal("0.%s" % (groups["second_fraction"] or 0)) * Decimal("1000000.0"))
try:
return datetime(
year=to_int(groups, "year"),
month=to_int(groups, "month", default=to_int(groups, "monthdash", required=False, default=1)),
day=to_int(groups, "day", default=to_int(groups, "daydash", required=False, default=1)),
hour=to_int(groups, "hour", default_to_zero=True),
minute=to_int(groups, "minute", default_to_zero=True),
second=to_int(groups, "second", default_to_zero=True),
microsecond=groups["second_fraction"],
tzinfo=tz,
)
except Exception as e:
raise ParseError(e)
|