赋值：

a, b, c = ‘xixi‘, ‘haha‘, ‘hehe‘  

连接字典：

>>> s = {1:‘a‘, 2:‘b‘, 3:‘c‘}

>>> s.keys()
[1, 2, 3]
>>> s.values()
[‘a‘, ‘b‘, ‘c‘]

>>> s.items()
[(1, ‘a‘), (2, ‘b‘), (3, ‘c‘)]

>>> [(k, v) for (k, v) in s.items()]
[(1, ‘a‘), (2, ‘b‘), (3, ‘c‘)]

>>> [(k:v) for (k, v) in s.items()]
  File "<stdin>", line 1
    [(k:v) for (k, v) in s.items()]
       ^
SyntaxError: invalid syntax

>>> [‘%d:%s‘%(k, v) for (k, v) in s.items()]
[‘1:a‘, ‘2:b‘, ‘3:c‘]

>>> ‘,‘.join([(‘%d:%s‘)%(k, v) for (k, v) in s.items()])
‘1:a,2:b,3:c‘

使用 if 0<i<10：, 比if i>0 and i<10: 性能要好