関連ワード:  len 1 2 3 in python    len ( 1 2 3 4 ) in python    what is the output of len ( 1 2 3 ) in python    what is the output of len ( 1 2 3 4 ) in python    what is the output of print len 1 2 3 4 )) in python    1//2*3 in python    1//2 in python    1//2 in python answer