1. 列表生成式
//
arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
redata = []
for i in arr:
if i % 2 != 0:
redata.append(i)
print(redata)
//
result = [ i for i in arr if i % 2 != 0 ]
print(result)
[1, 3, 5, 7, 9]
2. 字典生成式
//
d = {'a': 1, 'b': 2}
optd = {}
for k, v in d.items():
optd[v] = k
print(optd)
//
optd = {v: k for k, v in d.items()}
print(optd)
{1: 'a', 2: 'b'}
3. 集合生成式
arr = [1, 2, 3]
result = { x ** 2 for x in arr}
print(result)
{1, 4, 9}
