filter以及reduce的用法

 

简单的写了就几个例子

 # 删掉偶数
li = [1,2,3,4,5,6,7,8,9,10]
print(list(filter( lambda x : not x % 2 ==0 ,li)))
#保留年龄1000以下的
people = [
    {'name':'a','age':16},
    {'name':'c','age':100},
    {'name':'s','age':1000},
    {'name': 'd', 'age': 2000},
    {'name': 'f', 'age': 3000},
    {'name': 'g', 'age': 4000},
]

print(list(filter(lambda p:p['age']<1000,people)))

#列表中元素相加
from functools import reduce #需要导入
li= [1,2,3,4,100000,100]
print(reduce(lambda x,y:x+y,li,1)) 

from functools import reduce
li= ["dd","aa","cc"]
print(reduce(lambda x,y:x+y,li))