Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:

I have two questions about the proposed implementation:

1. Why not follow pytz lead and expose an instance of UTC rather than the UTC 
class itself?

2. Is there a real need to add a boolean argument to utcnow()?  I think 
timedelta.now(UTC()) or with utc = UTC() timedelta.now(utc) seems to be a more 
obvious way to produce TZ aware datetime.

If a singleton instance utc is exposed instead of UTC class, I would suggest to 
change its repr to 'datetime.utc'.

On the patch itself, datetime_utcnow() is missing an error check for 
PyObject_IsTrue() return value:

>>> class X:
...    def __nonzero__(self): raise RuntimeError
... 
>>> datetime.utcnow(tz_aware=X())
datetime.datetime(2010, 5, 25, 2, 12, 14, 739720, tzinfo=<datetime.UTC object 
at 0x1015aab80>)
XXX undetected error
..

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5094>
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