Difference Between Two datetimes

Peter Otten __peter__ at web.de
Mon Dec 28 23:22:09 CET 2009


W. eWatson wrote:

> This is quirky.
> 
>  >>> t1=datetime.datetime.strptime("20091205_221100","%Y%m%d_%H%M%S")
>  >>> t1
> datetime.datetime(2009, 12, 5, 22, 11)
>  >>> type(t1)
> <type 'datetime.datetime'>
>  >>>
> t1:  2009-12-05 22:11:00 <type 'datetime.datetime'>
> 
> but in the program:
>     import datetime
> 
>     t1=datetime.datetime.strptime("20091205_221100","%Y%m%d_%H%M%S")
>     print "t1: ",t1, type(t1)
> 
> produces
> t1:  2009-12-05 22:11:00 <type 'datetime.datetime'>
> 
> Where did the hyphens and colons come from?

print some_object

first converts some_object to a string invoking str(some_object) which in 
turn calls the some_object.__str__() method. The resulting string is then 
written to stdout. Quoting the documentation:

datetime.__str__()
    For a datetime instance d, str(d) is equivalent to d.isoformat(' ').

datetime.isoformat([sep])
    Return a string representing the date and time in ISO 8601 format, 
    YYYY-MM-DDTHH:MM:SS.mmmmmm or, if microsecond is 0, YYYY-MM-DDTHH:MM:SS

Peter



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