On 11/04/2014 08:52 AM, Roberto Martínez wrote:
I am trying to replace dinamically the __call__ method of an object
using setattr.
Example:
$ cat testcall.py
class A:
def __init__(self):
setattr(self, '__call__', self.newcall)
def __call__(self):
print("OLD")
def newcall(self):
print("NEW")
a=A()
a()
I expect to get "NEW" instead of "OLD", but in Python 3.4 I get "OLD".
Given that special methods can only be replaced on the class and not the
instance, you could create a new version of the class within __init__
and assign it to the instance:
class A:
def __init__(self, call_method=None):
if call_method:
methods = {'__call__': call_method}
self.__class__ = type('Custom_A', (A,), )
def __call__(self):
return 'original'
>> a = A()
>> a()
"old"
>> b = A(lambda self: 'new')
>> b()
"new"
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