New submission from Thomas Dimson <[EMAIL PROTECTED]>:
Having a peculiar issue (exception raised despite being valid) when
defining a decorator that takes a class method as a callback. Here is a
cooked example:
def decorator( callback ):
def inner(func):
def application( *args, **kwargs ):
callback(*args,**kwargs)
func(*args,**kwargs)
return application
return inner
class DecorateMe:
@decorator( callback=DecorateMe.callback )
def youBet( self ):
pass
def callback( self ):
print "Hello!"
>>> DecorateMe().youBet()
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
DecorateMe().youBet()
File "C:\Python25\badpython.py", line 4, in application
callback(*args,**kwargs)
TypeError: unbound method callback() must be called with DecorateMe
instance as first argument (got DecorateMe instance instead)
If you change the line "callback=DecorateMe.callback" to
"callback=lambda x: DecorateMe.callback(x)" python gives you:
>>> DecorateMe().youBet()
Hello!
Mysteriously, I did encounter this during my coding with a non-cooked
decorator.
----------
components: None
messages: 64830
nosy: tdimson
severity: normal
status: open
title: Invalid TypeError with class method decorator and class method parameter
type: behavior
versions: Python 2.4, Python 2.5
__________________________________
Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue2533>
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