class example (python)

class MyClassObject:
    def __init__(self):
        # this function must be in any class and will run when instantiated
        self.var = 100

    def print_value(self):
        # all class methods (functions) must have their first argument be 'self'
        print self.var

    def add_10(self):
        self.var = self.var + 10


a = MyClassObject()
a.print_value() # expect 100.  this will call the print_value method of the class
a.add_10()
a.print_value() # expect 110