实用:python中的lambda,zip,map和filter函数的使用

案例一:(构造列表)

[x for x in (lambda *args :map(lambda x:x+1,args))(*range(5))]

运行结果:

[1, 2, 3, 4, 5]

案例二:

[x for x in (lambda *args :zip('abcde',args))(*range(5))]

运行结果:

[('a', 0), ('b', 1), ('c', 2), ('d', 3), ('e', 4)]

案例三:

[x for x in (lambda *args :map(lambda x:(x,args),['a','b','c','d','e']))(*range(5))]    #此处args为自由变量,形成了闭包

运行结果:

[('a', (0, 1, 2, 3, 4)),
 ('b', (0, 1, 2, 3, 4)),
 ('c', (0, 1, 2, 3, 4)),
 ('d', (0, 1, 2, 3, 4)),
 ('e', (0, 1, 2, 3, 4))]

案例四:(构造生成器)

gt = (x for x in (lambda *args :map(lambda x:(x,args),['a','b','c','d','e']))(*range(5)))
for i in gt:
    print(i)

运行结果:

('a', (0, 1, 2, 3, 4))
('b', (0, 1, 2, 3, 4))
('c', (0, 1, 2, 3, 4))
('d', (0, 1, 2, 3, 4))
('e', (0, 1, 2, 3, 4))

案例五:(过滤能被3整除的数)

list(filter(lambda x:x%3==0,[1,3,5,7,9]))

运行结果:

[3, 9]