Source

Python 3 Patterns & Idioms / code / PythonForProgrammers / Simple2.py

# QuickPython/Simple2.py
from SimpleClass import Simple

class Simple2(Simple):
    def __init__(self, str):
        print("Inside Simple2 constructor")
        # You must explicitly call
        # the base-class constructor:
        Simple.__init__(self, str)
    def display(self):
        self.showMsg("Called from display()")
    # Overriding a base-class method
    def show(self):
        print("Overridden show() method")
        # Calling a base-class method from inside
        # the overridden method:
        Simple.show(self)

class Different:
    def show(self):
        print("Not derived from Simple")

if __name__ == "__main__":
    x = Simple2("Simple2 constructor argument")
    x.display()
    x.show()
    x.showMsg("Inside main")
    def f(obj): obj.show() # One-line definition
    f(x)
    f(Different())
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