1. enumerate
Input:
for i, j in enumerate(range(2,5)):
print(i,j)
Output:
0 2
1 3
2 4
注：i 为 index，j 为 value
2. zip
Input:
for i, j in zip(range(2,5), range(3,6)):
print(i,j)
Output:
2 3
3 4
4 5
注：zip中短的一项决定循环次数
3. itertools.product
Input:
from itertools import product
for i, j in product(range(2), range(3)):
print(i,j)
Output:
0 0
0 1
0 2
1 0
1 1
1 2
4. tqdm.tqdm
Input:
from tqdm import tqdm
for i in tqdm(range(10), desc='test'):
10**1000000
continue
Output:
test: 100%|████████████████████████████████████████████████████████████████████████████| 10/10 [00:02<00:00, 4.91it/s]