How to use functions between classes in python

Question

If I have more than one class in a python script, how do I call a function from the first class in the second class?

Here is an Example:

Class class1():

  def function1():
        blah blah blah

Class class2():

 *How do I call function1 to here from class1*

Answer 1

Functions in classes are also known as methods, and they are invoked on objects. The way to call a method in class1 from class2 is to have an instance of class1:

class Class2(object):
    def __init__(self):
        self.c1 = Class1()
        self.c1.function1()

Answer 2

The cleanest way is probably through inheritance:

class Base(object):
    def function1(self):
        # blah blah blah

class Class1(Base):
    def a_method(self):
        self.function1()  # works

class Class2(Base):
    def some_method(self):
        self.function1()  # works

c1 = Class1()
c1.function1()  # works
c2 = Class2()
c2.function1()  # works