sub-classing datetime

[Colin J. Williams]

I'm just making the transition from 2 to 3 for one module.

With Python 2.7, I had the benefit of mx datetime, but this is not yet
available for Python 3.2.

I find that the 3.2 datetime is not subclassable, for reasons that were
known some years back.

It would help if there was a note in the docs listing the builtin
classes which are not subclassable.

I am retreating to the use of a function.

Any other suggestions?

Colin W.

 

[marduk]

I'm just making the transition from 2 to 3 for one module.

With Python 2.7, I had the benefit of mx datetime, but this is not yet
available for Python 3.2.

I find that the 3.2 datetime is not subclassable, for reasons that were
known some years back.

It would help if there was a note in the docs listing the builtin
classes which are not subclassable.

I am retreating to the use of a function.

What makes you think it's not subclassable?:

import datetime

class MyDateTime(datetime.datetime):
def what_date(self):
print(self)


md = MyDateTime.now()
md.what_date()

Seems to work even in 2.7 (excluding the print function).