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}
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