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- from collections import namedtuple
- import datetime
- import sys
- import time
- Error = namedtuple('Error', ('metadata',))
- class UTC(datetime.tzinfo):
- """
- UTC implementation taken from Python's docs.
- Used only when pytz isn't available.
- """
- def __repr__(self):
- return "<UTC>"
- def utcoffset(self, dt):
- return datetime.timedelta(0)
- def tzname(self, dt):
- return "UTC"
- def dst(self, dt):
- return datetime.timedelta(0)
- def is_naive(dt):
- """
- Determines if a given datetime.datetime is naive.
- The concept is defined in Python's docs:
- http://docs.python.org/library/datetime.html#datetime.tzinfo
- Assuming value.tzinfo is either None or a proper datetime.tzinfo,
- value.utcoffset() implements the appropriate logic.
- """
- return dt.utcoffset() is None
- def is_aware(dt):
- return not is_naive(dt)
- def load_class(s):
- path, klass = s.rsplit('.', 1)
- __import__(path)
- mod = sys.modules[path]
- return getattr(mod, klass)
- def wrap_exception(new_exc_class):
- exc_class, exc, tb = sys.exc_info()
- raise new_exc_class('%s: %s' % (exc_class.__name__, exc))
- def make_naive(dt):
- """
- Makes an aware datetime.datetime naive in its time zone.
- """
- return dt.replace(tzinfo=None)
- def aware_to_utc(dt):
- """
- Converts an aware datetime.datetime in UTC time zone.
- """
- dt = dt.astimezone(UTC())
- assert not is_naive(dt), 'Must be a time zone aware datetime'
- return make_naive(dt)
- def local_to_utc(dt):
- """
- Converts a naive local datetime.datetime in UTC time zone.
- """
- return datetime.datetime(*time.gmtime(time.mktime(dt.timetuple()))[:6])
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