test_tz.py 文件源码

def _get_no_support_tzinfo_class(self, dt_start, dt_end, dst_only=False):
        # Generates a class of tzinfo with no support for is_ambiguous
        # where dates between dt_start and dt_end are ambiguous.

        class FoldingTzInfo(tzinfo):
            def utcoffset(self, dt):
                if not dst_only:
                    dt_n = dt.replace(tzinfo=None)

                    if dt_start <= dt_n < dt_end and getattr(dt_n, 'fold', 0):
                        return timedelta(hours=-1)

                return timedelta(hours=0)

            def dst(self, dt):
                dt_n = dt.replace(tzinfo=None)

                if dt_start <= dt_n < dt_end and getattr(dt_n, 'fold', 0):
                    return timedelta(hours=1)
                else:
                    return timedelta(0)

        return FoldingTzInfo