Python每日一练：如何在列表、字典、集合中筛选数据

# 1.通用的做法
data = [1,5,-3,-2,6,0,9]
res = []
for x in data:
    if x >= 0:
        res.append[x]
println(res)

# 2.列表筛选
from random import randint
data = [randint(-10,10) for _ in range(10)]
res = filter(lambda x : x >= 0,data)
print(list(res))

# 3.列表解析
res = [x for x in data if x >= 0]
print(res)

# 4.字典筛选
data = {x:randint(60,100) for x in range(1,20)}
# 过滤出分数高于90的同学
res = {k:v for k,v in data.items() if v >= 90}
print(res)

# 5.集合筛选
data = set([randint(-10,10) for _ in range(10)])
res = {x for x in data if x >= 0}
print(res)