How can I define a class in multi file(or module) in python

Question

So I want to define a Class A
looks like:

in a.py:

class A:
   def __init__(self):
       pass

   def some_method_in_a(self):
       pass

and now I want define some additional methods in b.py. looks like:

continue define class A:
def some_method_in_b_but_bellows_classA(self):
    pass

So are there any simple methods to do this?

What does 'continue define' means here? Adding some new methods to the old class? Overriding some attributes? — Leonardo.Z
– Leonardo.Z, Commented Oct 16, 2013 at 15:46

7yl4r · Accepted Answer · 2013-10-16 16:01:56Z

2

I believe you would typically accomplish this using inheritance.

You define general classes which your 'A' class inherits attributes or methods from. Something like:

/b.py:

class generalObjectLikeA:
    def some_method_in_b_but_bellows_classA(self):
        pass

/a.py:

class A(b.generalObjectLikeA):
    def __init__(self):
        pass

    def some_method_in_a(self):
        pass

edited Oct 16, 2013 at 16:01

answered Oct 16, 2013 at 15:56

7yl4r

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4 Comments

7yl4r Over a year ago

as a side note: camelCase is considered 'unpythonic', but I like it.

chepner Over a year ago

camelCase is only unpythonic for variable and function/method names. It's the recommended convention for class names.

Leonardo.Z Over a year ago

@chepner CamelCase is not camelCase

chepner Over a year ago

Good point. I glossed over the (lack of a) initial capitalization.

Leonardo.Z · Accepted Answer · 2013-10-16 16:19:41Z

1

If you don't want to use inheritance for some reasons(like monkey patch), functions and classes are normal objects in python, you can change them dynamiclly.

class A(object):
    pass

a = A()

def bar(self):
    print id(self)

A.foo = bar
a.foo()
b = A()
b.foo()

References:

Monkey patch

Monkeypatching For Humans

edited Oct 16, 2013 at 16:19

answered Oct 16, 2013 at 16:08

Leonardo.Z

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