zip函数

zip函数接受任意多个（包括0个和1个）序列作为参数，返回一个包含元组的列表。

x = [1, 2, 3]

y = [4, 5, 6]

z = [7, 8, 9]

xyz = zip(x, y, z)

print xyz

#结果：
[(1, 4, 7), (2, 5, 8), (3, 6, 9)]

x = [1, 2, 3]
y = [4, 5, 6, 7]
xy = zip(x, y)
print xy

#结果：
[(1, 4), (2, 5), (3, 6)]

x = [1, 2, 3]
x = zip(x)
print x

#结果：
[(1,), (2,), (3,)]

x = zip()
print x

#结果：
[]

x = [1, 2, 3]

y = [4, 5, 6]

z = [7, 8, 9]

xyz = zip(x, y, z)

#一般认为这是一个unzip的过程
u = zip(*xyz)

print u

#结果：
[(1, 2, 3), (4, 5, 6), (7, 8, 9)]

x = [1, 2, 3]
r = zip(* [x] * 3)
print r

#结果：
[(1, 1, 1), (2, 2, 2), (3, 3, 3)]

将[(1,), (2,), (3,)]转换为[1,2,3]：

ret = [('192.168.0.30',), ('192.168.0.57',)]
ret1 = zip(*ret)
ret2 = list(list(ret1)[0])
print(ret2)

#结果：
['192.168.0.30', '192.168.0.57']