Polymorphism
Conditions of the polymorphic implementation: inheritance, override inherited methods
Objective polymorphism: an interface reuse. An interface passed in different objects, the method for performing the same, different results .
For example, the definition of a parent class: printer. Two sub-categories: color printers, monochrome printers.
Definition of a human, the method used with the printer, using a different printer, to print different results.
class Printer(object):
def print_something(self):
pass
class ColorPrinter(Printer):
def print_something(self):
print ( "print out color content")
class BlackPrinter(Printer):
def print_something(self):
print ( "Print out the contents of the black and white")
class Person(object):
def make_print(self, obj):
obj.print_something()
bp = BlackPrinter()
cp = ColorPrinter()
xiaoming = Person()
When xiaoming.make_print (cp) # incoming cp, the result is: print out the color content. When incoming bp, the result is: black and white print out the contents