Contents:
MyClass1
MyClass1.my_string
MyClass1.A_NICE_CONSTANT
MyClass1.A_VERY_NICE_CONSTANT
MyClass1.a_square
MyClass1.addition()
MyClass1.divide_a_by_c_and_add_d()
MyClass1.update_b_from_class_2()
MyClass2
MyClass2.addition()
MyClass3
MyClass3.addition()