Hello
How can I do something similar to pure virtual functions in C++ ?
Let us consider this:
class C1:
# Pure virtual
def cb(self, param1, param2):
"""
This is a callback
@param param1: ...
@param param2: ...
"""
raise NotImplementedError, "Implement me"
# Implementation w/o a 'cb', thus 'cb' should not be used
class C2(C1):
def __init__(self):
pass
# Implementation w/ 'cb', thus 'cb' can be used
class C3(C1):
def __init__(self):
pass
def cb(self, param1, param2):
print "i am c3 cb"
# Dispatcher function that calls 'cb' only if 'cb' is implemented in
child classes
def dispatcher(c):
if hasattr(c, 'cb'):
c.cb("Hello", "World")
dispatcher(C2())
dispatcher(C3())
What I want is the ability to have the dispatcher() not to call 'cb'
if it was not implemented in one of the child classes.
Please advise.
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