Can't subclass datetime.datetime?

[Grant Edwards]

On 2005-02-14, Steven Bethard <steven.bethard at gmail.com> wrote:
> Grant Edwards wrote:
>> Is it true that a datetime object can convert itself into a
>> string, but not the other way around?  IOW, there's no simple
>> way to take the output from str(d) and turn it back into d?
>
> I assume this is true because there is not one standard format
> for a date-time string.

There seems to be a de-facto standard format: that which is
returned by the str(d).

>> class MyDatetime(datetime.datetime):
>>     def __init__(self,s):
[...]

> datetime.datetime objects are immutable, so you need to define
> __new__ instead of __init__:

Thanks. I should have known that. I guess I've never subclassed
an immutible type before.

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