W. eWatson wrote:
> Peter Otten wrote:
>> 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
> So as long as I don't print it, it's datetime.datetime and I can make
> calculations or perform operations on it as though it is not a string,
> but a datetime object?
Not "as though", it *is* a datetime object. And it knows how to show as
something meaningful to the user when printed
These are very basic concepts that apply to all Python objects. I suggest
that you take a moment to go through the tutorial before you continue with
your efforts.
Peter
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