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# Source code for icalendar.timezone

    """This package contains all functionality for timezones."""

    from .tzid import tzid_from_dt, tzid_from_tzinfo, tzids_from_tzinfo
    from .tzp import TZP

    tzp = TZP()

    def use_pytz():
        """Use pytz as the implementation that looks up and creates timezones."""
        tzp.use_pytz()

    def use_zoneinfo():
        """Use zoneinfo as the implementation that looks up and creates timezones."""
        tzp.use_zoneinfo()

    __all__ = [
        "TZP",
        "tzp",
        "use_pytz",
        "use_zoneinfo",
        "tzid_from_tzinfo",
        "tzid_from_dt",
        "tzids_from_tzinfo",
    ]