# This file is part of Hypothesis, which may be found at
# Most of this work is copyright (C) 2013-2017 David R. MacIver
# (email@example.com), but it contains contributions by others. See
# CONTRIBUTING.rst for a full list of people who may hold copyright, and
# consult the git log if you need to determine who owns an individual
# 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
# obtain one at http://mozilla.org/MPL/2.0/.
# END HEADER
"""This module provides ``pytz`` timezones.
You can use this strategy to make
:py:func:`hypothesis.strategies.times` produce timezone-aware values.
from __future__ import division, print_function, absolute_import
import datetime as dt
import hypothesis.strategies as st
__all__ = ['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
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)