Methods in Classes, 2

• Instead of defining a function outside of a class definition and binding it to a class attribute, we define a method directly inside (indented) of a class definition.
• A method is “just” a function which is defined inside of a class.
• The first parameter is used a reference to the calling instance.
• This parameter is usually called self.
• Self corresponds to the Robot object x.

class Robot:

def say_hi(self):

print("Hi, I am " + self.name)

x = Robot()

x.name = "Marvin"

x.say_hi()

# we can also call it like this:

Robot.say_hi(x)

Problem of the previous class definition:

After having initialised a Robot robot, we shouldn't forget to assign a name to the robot in an additional statement.