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backend/venv/Lib/site-packages/hypothesis/extra/dateutil.py

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+# This file is part of Hypothesis, which may be found at
+# https://github.com/HypothesisWorks/hypothesis/
+#
+# Copyright the Hypothesis Authors.
+# Individual contributors are listed in AUTHORS.rst and the git log.
+#
+# 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 https://mozilla.org/MPL/2.0/.
+
+"""
+--------------------
+hypothesis[dateutil]
+--------------------
+
+This module provides :pypi:`dateutil <python-dateutil>` timezones.
+
+You can use this strategy to make :func:`~hypothesis.strategies.datetimes`
+and :func:`~hypothesis.strategies.times` produce timezone-aware values.
+"""
+
+import datetime as dt
+
+from dateutil import tz, zoneinfo  # type: ignore
+
+from hypothesis import strategies as st
+from hypothesis.strategies._internal.utils import cacheable, defines_strategy
+
+__all__ = ["timezones"]
+
+
+def __zone_sort_key(zone):
+    """Sort by absolute UTC offset at reference date,
+    positive first, with ties broken by name.
+    """
+    assert zone is not None
+    offset = zone.utcoffset(dt.datetime(2000, 1, 1))
+    offset = 999 if offset is None else offset
+    return (abs(offset), -offset, str(zone))
+
+
+@cacheable
+@defines_strategy()
+def timezones() -> st.SearchStrategy[dt.tzinfo]:
+    """Any timezone from :pypi:`dateutil <python-dateutil>`.
+
+    This strategy minimises to UTC, or the timezone with the smallest offset
+    from UTC as of 2000-01-01, and is designed for use with
+    :py:func:`~hypothesis.strategies.datetimes`.
+
+    Note that the timezones generated by the strategy may vary depending on the
+    configuration of your machine. See the dateutil documentation for more
+    information.
+    """
+    all_timezones = sorted(
+        (tz.gettz(t) for t in zoneinfo.get_zonefile_instance().zones),
+        key=__zone_sort_key,
+    )
+    all_timezones.insert(0, tz.UTC)
+    # We discard Nones in the list comprehension because Mypy knows that
+    # tz.gettz may return None.  However this should never happen for known
+    # zone names, so we assert that it's impossible first.
+    assert None not in all_timezones
+    return st.sampled_from([z for z in all_timezones if z is not None])