<23>python学习笔记——列表解析，字典解析，集合解析筛选元素

from random import randint
data = [1,5,-3,-6,8,0,9]
list = []
for x in data:
if x >=0:
list.append(x)
print(list)
[1, 5, 8, 0, 9]

from random import randint
data = [randint(-10,10) for _ in range(10)]
data
Out[9]:
[7, 3, -4, 4, 10, -2, 6, 1, 1, -6]
filter(lambda x:x>=0 ,data)
Out[10]:
<filter at 0x1c5eb204a58>

data
Out[18]:
[7, 3, -4, 4, 10, -2, 6, 1, 1, -6]
[x for x in data if x>=0]
Out[19]:
[7, 3, 4, 10, 6, 1, 1]

dict = {x : randint(60,100) for x in range(1,21)}
dict
Out[21]:
{1: 92,
2: 85,
3: 100,
4: 91,
5: 78,
6: 62,
7: 80,
8: 83,
9: 71,
10: 73,
11: 73,
12: 74,
13: 74,
14: 84,
15: 87,
16: 68,
17: 70,
18: 70,
19: 85,
20: 67}

{k: v for k,v in dict.items() if v >90}
Out[24]:
{1: 92, 3: 100, 4: 91}

data
Out[25]:
[7, 3, -4, 4, 10, -2, 6, 1, 1, -6]
s = set(data)
s
Out[27]:
{-6, -4, -2, 1, 3, 4, 6, 7, 10}
{ x for x in s if x%3==0}
Out[28]:
{-6, 3, 6}