Confused by Method(function) of a module and method ofaclass/instance
Fredrik Lundh
fredrik at pythonware.com
Tue Mar 7 02:51:31 EST 2006
"Sullivan WxPyQtKinter" wrote:
> More confusing things came out to me:
> >>>str().lower()
> '' #well, this is
> understandable.
> >>>str.lower(str(),'A')
> 'a'
>
> How do you explain this result?
I get:
>>> str.lower(str(), 'A')
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: lower() takes no arguments (1 given)
if you meant to write
>>> str.lower('A')
'a'
it's because "str" is the class that implements methods for the "str" type,
and, for an instance I of the class C:
I.method()
and
C.method(I)
are, in general, the same thing in Python
</F>
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