Instance variables vs. class (static) variables

instance_class_variable.py

class MyClass:
    my_static_variable = "Static"    # not self.
    def __init__(self):
        self.my_instance_variable = "Instance"
    def change_static(self):
        MyClass.my_static_variable = "Changed"   # not self.
    def change_instance(self):
        self.my_instance_variable = "Also changed"


my_first_instance = MyClass()
my_second_instance = MyClass()
my_first_instance.change_static()      # Will also change the second 
my_first_instance.change_instance()    # instance variable

my_second_instance.my_static_variable
my_second_instance.my_instance_variable