python里的str.format怎么用啊
如题，能不能说的详细点

[解决办法]

Python code

>>> '{0}, {1}, {2}'.format('a', 'b', 'c')'a, b, c'>>> '{}, {}, {}'.format('a', 'b', 'c')  # 2.7+ only'a, b, c'>>> '{2}, {1}, {0}'.format('a', 'b', 'c')'c, b, a'>>> '{2}, {1}, {0}'.format(*'abc')      # unpacking argument sequence'c, b, a'>>> '{0}{1}{0}'.format('abra', 'cad')   # arguments' indices can be repeated'abracadabra'