python 的几个内置函数（lambda ,zip, filter, map, reduce ）用法

# -*- coding: utf-8 -*-

if __name__ == '__main__':
# lambda
f = lambda x: x+2
print f(3)
print (lambda x, y: x+y)(3, 5)

# map
list = [1, 2, 3]
print map(lambda x:x*2, list)

# reduce
print reduce(lambda x, y: x+y, list)

# zip
x = [1, 2, 3]
y = ['a', 'b', 'c']
print zip(x, y)
print zip(*zip(x, y))

# filter
l = ['abc', 'acd', '1234', 'ddad', 'aaa']
print filter(lambda s: s.startswith('a'), l)