How do I learn operator overriding?
Erik Max Francis
max at alcyone.com
Fri Sep 19 21:41:55 CEST 2003
python at sarcastic-horse.com wrote:
> The only problem is that I have no idea how to override operators in
> python. Can anyone give me a few trivial examples of how it is done?
Just override the __sub__ method:
>>> class Date:
... def __init__(self, year, quarter):
... self.year = year
... self.quarter = quarter
... def quarters(self):
... return self.year*4 + self.quarter
... def __sub__(self, other):
... return self.quarters() - other.quarters()
<class __main__.Date at 0x402e053c>
>>> q1 = Date(2001, 1)
>>> q4 = Date(2001, 4)
>>> q4 - q1
> And, on a completely unrelated note, I am getting a truly amazing
> of spam today. Anyone else?
Yep. I've gotten 262 MB since 2 am this morning. Another worm is out
and about, I'd presume.
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