Sometimes you’ll want one class that inherits from another to not only take on the methods and attributes of its parent, but to override one or more of them.

class Employee(object):
  def __init__(self, name):
    self.name = name
  def greet(self, other):
    print "Hello, %s" % other.name

class CEO(Employee):
  def greet(self, other):
    print "Get back to work, %s!" % other.name

ceo = CEO("Emily")
emp = Employee("Steve")
emp.greet(ceo)
# Hello, Emily
ceo.greet(emp)
# Get back to work, Steve!

Rather than have a separate greet_underling method for our CEO, we override (or re-create) the greet method on top of the base Employee.greet method. This way, we don’t need to know what type of Employee we have before we greet another Employee.