Python using methods from other classes

Question

If I have two classes, and one of them has a function that I want to use in my other class, what do I use so that I don't have to rewrite my function?

Answer 1

There are two options:

• instanciate an object in your class, then call the desired method on it
• use @classmethod to turn a function into a class method

Example:

class A(object):     def a1(self):         """ This is an instance method. """         print "Hello from an instance of A"      @classmethod     def a2(cls):         """ This a classmethod. """         print "Hello from class A"  class B(object):     def b1(self):         print A().a1() # => prints 'Hello from an instance of A'         print A.a2() # => 'Hello from class A' 

Or use inheritance, if appropriate:

class A(object):     def a1(self):         print "Hello from Superclass"  class B(A):     pass  B().a1() # => prints 'Hello from Superclass'