python reduce函数 day16

首先从功能模块中导入函数

from functools import reduce

要实现的功能

num_1 = [1,2,3,4,5,6,100]
# res = 0
# for num in num_1:
#     res +=num
# print (res)
#
# def reduce_test(array):
#     res = 0
#     for num in array:
#         res+=num
#     return res
# print(reduce_test(num_1))

实现代码

# from functools import reduce
num_1 = [1,2,3,4,5,6,100]

def reduce_test(func,array):
    res = array.pop(0)
    for num in array:
        res=func(res,num)
    return res
# print(reduce_test(num_1))
print(reduce_test(lambda x,y:x*y,num_1))

# from functools import reduce
num_1 = [1,2,3,4,5,6,100]

def reduce_test(func,array,init=None):
    if init is None:
        res = array.pop(0)
    else:
        res = init
    for num in array:
        res=func(res,num)
    return res
# print(reduce_test(num_1))
print(reduce_test(lambda x,y:x*y,num_1,0))

reduce将所有元素运算行成一个数，公式，列表，默认值