筛选字典或集合中的数据

from random import randint

# 生成一个学生成绩字典
d = {x:randint(60,100) for x in range(1,21)}
print(d)

res = {k:v for k,v in d.items() if v > 90}
print(res)

运行结果：

{1: 69, 2: 90, 3: 76, 4: 68, 5: 80, 6: 74, 7: 71, 8: 96, 9: 86, 10: 66, 11: 64, 12: 67, 13: 68, 14: 90, 15: 93, 16: 71, 17: 78, 18: 75, 19: 78, 20: 77}
{8: 96, 15: 93}

s = {1, 5, -3, -2, 6, 0, 9}
res = {x for x in s if x >= 0}
print(res)

运行结果：

{0, 1, 5, 6, 9}