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Delete timezones.py
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Matteo ℱan
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timezones.py
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timezones.py
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#!/usr/bin/python
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#
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# Copyright 2009 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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#
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# Disable the invalid name warning as we are inheriting from a standard library
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# object.
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# pylint: disable-msg=C6409,W0212
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"""
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Stripped down version of `python-datetime-tz` that only contains the "find local
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timezone" bits.
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"""
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import datetime
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import os.path
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import time
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import warnings
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import pytz
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# Need to patch pytz.utc to have a _utcoffset so you can normalize/localize
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# using it.
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pytz.utc._utcoffset = datetime.timedelta()
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timedelta = datetime.timedelta
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def _tzinfome(tzinfo):
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"""Gets a tzinfo object from a string.
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Args:
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tzinfo: A string (or string like) object, or a datetime.tzinfo object.
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Returns:
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An datetime.tzinfo object.
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Raises:
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UnknownTimeZoneError: If the timezone given can't be decoded.
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"""
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if not isinstance(tzinfo, datetime.tzinfo):
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try:
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tzinfo = pytz.timezone(tzinfo)
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except AttributeError:
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raise pytz.UnknownTimeZoneError("Unknown timezone!")
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return tzinfo
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# Our "local" timezone
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_localtz = None
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def localtz():
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"""Get the local timezone.
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Returns:
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The localtime timezone as a tzinfo object.
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"""
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# pylint: disable-msg=W0603
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global _localtz
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if _localtz is None:
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_localtz = detect_timezone()
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return _localtz
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def detect_timezone():
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"""Try and detect the timezone that Python is currently running in.
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We have a bunch of different methods for trying to figure this out (listed in
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order they are attempted).
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* Try and find /etc/timezone file (with timezone name).
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* Try and find /etc/localtime file (with timezone data).
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* Try and match a TZ to the current dst/offset/shortname.
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Returns:
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The detected local timezone as a tzinfo object
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Raises:
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pytz.UnknownTimeZoneError: If it was unable to detect a timezone.
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"""
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tz = _detect_timezone_etc_timezone()
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if tz is not None:
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return tz
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tz = _detect_timezone_etc_localtime()
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if tz is not None:
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return tz
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# Next we try and use a similiar method to what PHP does.
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# We first try to search on time.tzname, time.timezone, time.daylight to
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# match a pytz zone.
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warnings.warn("Had to fall back to worst detection method (the 'PHP' "
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"method).")
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tz = _detect_timezone_php()
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if tz is not None:
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return tz
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raise pytz.UnknownTimeZoneError("Unable to detect your timezone!")
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def _detect_timezone_etc_timezone():
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if os.path.exists("/etc/timezone"):
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try:
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tz = file("/etc/timezone").read().strip()
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try:
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return pytz.timezone(tz)
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except (IOError, pytz.UnknownTimeZoneError), ei:
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warnings.warn("Your /etc/timezone file references a timezone (%r) that"
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" is not valid (%r)." % (tz, ei))
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# Problem reading the /etc/timezone file
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except IOError, eo:
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warnings.warn("Could not access your /etc/timezone file: %s" % eo)
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def _detect_timezone_etc_localtime():
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matches = []
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if os.path.exists("/etc/localtime"):
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localtime = pytz.tzfile.build_tzinfo("/etc/localtime",
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file("/etc/localtime"))
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# See if we can find a "Human Name" for this..
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for tzname in pytz.all_timezones:
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tz = _tzinfome(tzname)
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if dir(tz) != dir(localtime):
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continue
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for attrib in dir(tz):
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# Ignore functions and specials
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if callable(getattr(tz, attrib)) or attrib.startswith("__"):
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continue
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# This will always be different
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if attrib == "zone" or attrib == "_tzinfos":
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continue
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if getattr(tz, attrib) != getattr(localtime, attrib):
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break
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# We get here iff break didn't happen, i.e. no meaningful attributes
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# differ between tz and localtime
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else:
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matches.append(tzname)
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#if len(matches) == 1:
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# return _tzinfome(matches[0])
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#else:
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# # Warn the person about this!
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# warning = "Could not get a human name for your timezone: "
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# if len(matches) > 1:
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# warning += ("We detected multiple matches for your /etc/localtime. "
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# "(Matches where %s)" % matches)
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# else:
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# warning += "We detected no matches for your /etc/localtime."
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# warnings.warn(warning)
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#
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# return localtime
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if len(matches) > 0:
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return _tzinfome(matches[0])
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def _detect_timezone_php():
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tomatch = (time.tzname[0], time.timezone, time.daylight)
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now = datetime.datetime.now()
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matches = []
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for tzname in pytz.all_timezones:
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try:
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tz = pytz.timezone(tzname)
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except IOError:
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continue
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try:
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indst = tz.localize(now).timetuple()[-1]
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if tomatch == (tz._tzname, -tz._utcoffset.seconds, indst):
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matches.append(tzname)
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# pylint: disable-msg=W0704
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except AttributeError:
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pass
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if len(matches) > 1:
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warnings.warn("We detected multiple matches for the timezone, choosing "
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"the first %s. (Matches where %s)" % (matches[0], matches))
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return pytz.timezone(matches[0])
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