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python map不一样应用
source link: https://blog.51cto.com/u_14967494/5931281
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map(function, iterable, ...)
function: 针对每个迭代对象的函数
iterable 可迭代对象
注意： function 中参数和iterable个数对应
单个可迭代对象（不常用）
list(map(lambda x:x*2, range(10)))
list(map(str, range(10)))
单个可迭代对象多数可以直接使用列表推倒式更加方便。
多个可迭代对象（常用）
案例1：列表中每个元素为dict的公共键
from random import randint, sample
from functions import reduce
l1 = [{item: randint(1, 5) for item in sample('abcdefg', randint(4, 5))} for _ in range(5)]
reduce(lambda a, b: a & b, map(dict.keys, l1))
a1 = [1, 2, 3]
a2 = [1, 2, 3]
a3 = [1, 2, 3, 5]
list(map(lambda a, b, c: a + b + c, a1, a2, a3))
zip、filter 知道就行
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