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Direktori : /proc/thread-self/root/proc/thread-self/root/lib/python3.6/site-packages/pyrfc3339/ |
Current File : //proc/thread-self/root/proc/thread-self/root/lib/python3.6/site-packages/pyrfc3339/parser.py |
import re from datetime import datetime import pytz from pyrfc3339.utils import FixedOffset def parse(timestamp, utc=False, produce_naive=False): ''' Parse an :RFC:`3339`-formatted timestamp and return a `datetime.datetime`. If the timestamp is presented in UTC, then the `tzinfo` parameter of the returned `datetime` will be set to `pytz.utc`. >>> parse('2009-01-01T10:01:02Z') datetime.datetime(2009, 1, 1, 10, 1, 2, tzinfo=<UTC>) Otherwise, a `tzinfo` instance is created with the appropriate offset, and the `tzinfo` parameter of the returned `datetime` is set to that value. >>> parse('2009-01-01T14:01:02-04:00') datetime.datetime(2009, 1, 1, 14, 1, 2, tzinfo=<UTC-04:00>) However, if `parse()` is called with `utc=True`, then the returned `datetime` will be normalized to UTC (and its tzinfo parameter set to `pytz.utc`), regardless of the input timezone. >>> parse('2009-01-01T06:01:02-04:00', utc=True) datetime.datetime(2009, 1, 1, 10, 1, 2, tzinfo=<UTC>) The input is strictly required to conform to :RFC:`3339`, and appropriate exceptions are thrown for invalid input. >>> parse('2009-01-01T06:01:02') Traceback (most recent call last): ... ValueError: timestamp does not conform to RFC 3339 >>> parse('2009-01-01T25:01:02Z') Traceback (most recent call last): ... ValueError: hour must be in 0..23 ''' parse_re = re.compile(r'''^(?:(?:(?P<date_fullyear>[0-9]{4})\-(?P<date_month>[0-9]{2})\-(?P<date_mday>[0-9]{2}))T(?:(?:(?P<time_hour>[0-9]{2})\:(?P<time_minute>[0-9]{2})\:(?P<time_second>[0-9]{2})(?P<time_secfrac>(?:\.[0-9]{1,}))?)(?P<time_offset>(?:Z|(?P<time_numoffset>(?P<time_houroffset>(?:\+|\-)[0-9]{2})\:(?P<time_minuteoffset>[0-9]{2}))))))$''', re.I | re.X) match = parse_re.match(timestamp) if match is not None: if match.group('time_offset') in ["Z", "z", "+00:00", "-00:00"]: if produce_naive is True: tzinfo = None else: tzinfo = pytz.utc else: if produce_naive is True: raise ValueError("cannot produce a naive datetime from " + "a local timestamp") else: tzinfo = FixedOffset(int(match.group('time_houroffset')), int(match.group('time_minuteoffset'))) secfrac = match.group('time_secfrac') if secfrac is None: microsecond = 0 else: microsecond = int(round(float(secfrac) * 1000000)) dt_out = datetime(year=int(match.group('date_fullyear')), month=int(match.group('date_month')), day=int(match.group('date_mday')), hour=int(match.group('time_hour')), minute=int(match.group('time_minute')), second=int(match.group('time_second')), microsecond=microsecond, tzinfo=tzinfo) if utc: dt_out = dt_out.astimezone(pytz.utc) return dt_out else: raise ValueError("timestamp does not conform to RFC 3339")