def method1():  # Function: outside of class
    print("Calling function called method1")

class Person:
    def method1(self): # Method: inside of class
        print("Calling method1")

    # Exclude 'self' calls the function not a method
    def method2(self):
        print("Calling method2")
        method1()  # No self: actually calls a function

def start():
    aPerson = Person()
    aPerson.method1()
    aPerson.method2()

start()