Checklist

[mahmoudimus]

• raise XXXX => fail()
• self => callablestruct (?)
• is => ==
• is not => !=

[mahmoudimus]

'string %s int.%d int %d' % ('a', '1', '2') => 'string {} int {} int {}'.format('a', 1, 2)

[mahmoudimus]

type(xx) is => types.is_xx