# -*- coding: UTF-8 -*-
'''
map(function, iterable, …)
function -- 函数
iterable -- 一个或多个序列
返回值
Python 2.x 返回列表。
Python 3.x 返回迭代器。
'''
# 1.1 简单用法
lst = ['1', '2', '3']
lst1 = list(map(int, lst))
print(lst1) # [1, 2, 3]
def add(x):
return x + 100
lst = [1, 2, 3]
lst1 = list(map(add, lst))
print(lst1) # [101, 102, 103]
# 1.2 多个可迭代参数
def add3(x, y, z):
return x * 10 + y * 10 + z
lst = [1, 2, 3]
lst1 = [1, 2, 3, 4]
lst2 = [1, 2, 3, 4, 5]
lst3 = list(map(add3, lst, lst1, lst2))
print(lst3) # [21, 42, 63]
# 1.3 与 lambda
lst = [1, 2, 3]
lst1 = list(map(lambda x: x * x, lst))
print(lst1) # [1, 4, 9]
lst2 = list(map(lambda x, y: x + y, [1, 3, 5, 7, 9], [2, 4, 6, 8, 10]))
print(lst2) # 3, 7, 11, 15, 19]
