On Class namespaces, calling methods
Duncan Booth
duncan.booth at invalid.invalid
Sat Apr 10 12:35:29 EDT 2010
vsoler <vicente.soler at gmail.com> wrote:
> On Apr 10, 4:46 pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>> vsoler <vicente.so... at gmail.com> wrote:
>> > I get the following error message:
>>
>> > TypeError: m() takes no arguments (1 given)
>>
<snip>
>> Which version of Python are you using? Python 2.6 gives:
>>
>> TypeError: unbound method m() must be called with Uno instance as first
>> argument (got nothing instead)
>>
<snip>
> Hello Duncan,
>
> Your error message is correct if you use class Uno(object):
> However, the error message is different under class Uno:
>
Odd. That's not what I get:
Python 2.6.1 (r26:67517, Dec 4 2008, 16:59:09) [MSC v.1500 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
****************************************************************
Personal firewall software may warn about the connection IDLE
makes to its subprocess using this computer's internal loopback
interface. This connection is not visible on any external
interface and no data is sent to or received from the Internet.
****************************************************************
IDLE 2.6.1
>>> class Uno:
a=1
def m():
print "mouse"
>>> Uno.m()
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
Uno.m()
TypeError: unbound method m() must be called with Uno instance as first argument (got nothing instead)
>>>
Anyway, the moral is never, ever to use old-style classes in Python 2.x.
You will get weird and unexpected results.
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