from types import MethodType
class A(object):
def m(self):
print 'aaa'
a = A()
def new_m(self):
print 'bbb'
a.m = MethodType(new_m, a)
Here is what the above code is Doing:
1. Create a class A.
2. Create an instance of A.
3. Define a function new_m.
4. Bind new_m to the instance a.
5. Call the new method.
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