inheriting from datetime

[Rob Conner]

So this is simple, why can't I run the following code? I've tried many
variances of this, but simply cannot inherit from datetime or
datetime.dateti me. I get this on line 3.
TypeError: function takes at most 2 arguments (3 given)

*************** *************** **
import datetime
_datetime = datetime.dateti me

class MyDateTime(_dat etime):
"""
Identical to builtin datetime.dateti me, except it accepts
invalid dates and times as input.
"""
_valid = True

def __init__(self, year, month, day, *args, **kw):
try:
_datetime.__ini t__(self, year, month, day, *args, **kw)
except _datetime.Value Error:
_valid = False
self.year = year
self.month = month
self.day = day
self.args = args
self.kw = kw
*************** *************** **

[Grant Edwards]

Re: inheriting from datetime

On 2005-08-01, Rob Conner <rtconner@gmail .com> wrote:
[color=blue]
> So this is simple, why can't I run the following code? I've tried many
> variances of this, but simply cannot inherit from datetime or
> datetime.dateti me. I get this on line 3.
> TypeError: function takes at most 2 arguments (3 given)[/color]

I think I posted this question a while back and the problem was
that a datetime instance is not mutable, so the normal method
of deriving a class didn't work....

A quick google...

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/5f2517ecf6fb2ce/

You need to override __new__ rather than __init__

--
Grant Edwards grante Yow! I'm ANN LANDERS!! I
at can SHOPLIFT!!
visi.com

[Lee Harr]

Re: inheriting from datetime

On 2005-08-01, Rob Conner <rtconner@gmail .com> wrote:[color=blue]
> So this is simple, why can't I run the following code? I've tried many
> variances of this, but simply cannot inherit from datetime or
> datetime.dateti me. I get this on line 3.
> TypeError: function takes at most 2 arguments (3 given)
>
> *************** *************** **
> import datetime
> _datetime = datetime.dateti me
>
> class MyDateTime(_dat etime):
> """
> Identical to builtin datetime.dateti me, except it accepts
> invalid dates and times as input.
> """
> _valid = True
>
> def __init__(self, year, month, day, *args, **kw):
> try:
> _datetime.__ini t__(self, year, month, day, *args, **kw)
> except _datetime.Value Error:
> _valid = False
> self.year = year
> self.month = month
> self.day = day
> self.args = args
> self.kw = kw
> *************** *************** **
>[/color]



It helps to post the actual code and error message you
are seeing...


[color=blue][color=green][color=darkred]
>>> import datetime
>>> class foo(datetime):[/color][/color][/color]
.... pass
....
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: function takes at most 2 arguments (3 given)[color=blue][color=green][color=darkred]
>>> class foo(datetime.da tetime):[/color][/color][/color]
.... pass
....[color=blue][color=green][color=darkred]
>>> d = foo()[/color][/color][/color]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: function takes at least 3 arguments (0 given)[color=blue][color=green][color=darkred]
>>> d = foo(1, 2, 3)
>>> d[/color][/color][/color]
foo(1, 2, 3, 0, 0)[color=blue][color=green][color=darkred]
>>> datetime.dateti me(1, 2, 3)[/color][/color][/color]
datetime.dateti me(1, 2, 3, 0, 0)



My guess is that the code you posted is not really the
code you were runnning.

[rafi]

Re: inheriting from datetime

Rob Conner wrote:[color=blue]
> So this is simple, why can't I run the following code? I've tried many
> variances of this, but simply cannot inherit from datetime or
> datetime.dateti me. I get this on line 3.
> TypeError: function takes at most 2 arguments (3 given)[/color]

line 3 of the following code or line 3 of the use of the code?

on my box it runs, except that ValueError is not caught by the except.

side question: what is the point of accepting invalid dates?

--
rafi

"Imaginatio n is more important than knowledge."
(Albert Einstein)

[Rob Conner]

Re: inheriting from datetime

gah, yeah that was strange. but i got it now. thanks.
[color=blue]
> side question: what is the point of accepting invalid dates?[/color]
thats a long story. but it would be nice to have invalid dates at least
just stored. so i want to try to put a class together that does it.