関連ワード:  what is self in python class    what is self in python class method    what is self in python class of oop    what is the purpose of self in python class methods    what is the purpose of self in python classes    what is the use of self in python class    what is the self parameter in python class methods    what is the self variable in python class represent    what is the self keyword in python classes    what is the self keyword in python class methods