Source code for hypothesis.extra.pytz

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# Most of this work is copyright (C) 2013-2017 David R. MacIver
# (david@drmaciver.com), but it contains contributions by others. See
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# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
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"""This module provides ``pytz`` timezones.

You can use this strategy to make
:py:func:`hypothesis.strategies.datetimes` and
:py:func:`hypothesis.strategies.times` produce timezone-aware values.

"""

from __future__ import division, print_function, absolute_import

import datetime as dt

import pytz

import hypothesis.strategies as st

__all__ = ['timezones']


@st.cacheable
@st.defines_strategy
[docs]def timezones(): """Any timezone in the Olsen database, as a pytz tzinfo object. This strategy minimises to UTC, or the smallest possible fixed offset, and is designed for use with :py:func:`hypothesis.strategies.datetimes`. """ all_timezones = [pytz.timezone(tz) for tz in pytz.all_timezones] # Some timezones have always had a constant offset from UTC. This makes # them simpler than timezones with daylight savings, and the smaller the # absolute offset the simpler they are. Of course, UTC is even simpler! static = [pytz.UTC] + sorted( (t for t in all_timezones if isinstance(t, pytz.tzfile.StaticTzInfo)), key=lambda tz: abs(tz.utcoffset(dt.datetime(2000, 1, 1))) ) # Timezones which have changed UTC offset; best ordered by name. dynamic = [tz for tz in all_timezones if tz not in static] return st.sampled_from(static + dynamic)