多变量赋值
>>> a = b = c = 1
>>> pr
a, b, c
1 1 1
>>> (a, b, c) = range(3)
>>> pr a, b, c
0 1 2
>>> (a, b, c) = ("a", "b", "c")
>>> pr a, b, c
a b c连接
串>>> (a, b, c) = ("a", "b", "c")
>>> pr a, b, c
a b c
>>> s = ("a", "b", "c")
>>> ",".join(s)
'a,b,c'
>>> s = {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 0 < i < 10 要比 使用 i > 0 and i < 10 性能更好
些>>> def test(i):
(0 < i < 10):
pr "ok"
:
pr "..."
>>> test(4)
ok
>>> test(12)
...
>>> test(0)
...不要使用
i 来递增Python 虽然支持
i
但实际表示
意思是 +(+i)我们可以使用 i 
1 来实现递增
>>> i = -10
>>> i
-10
>>> i 1
>>> i
-9
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