関連ワード:  explain the use of self in python classes    explain the use of self in python    what is the use of self in python functions    what is the use of self in python with example    what is the use of self keyword in python    what is the use of self parameter in python    what is the use of self function in python    what is the use of self argument in python    8 what is the use of self in python    what is the use of self variable in python