python 中有趣的库tqdm

Tqdm 是 Python 进度条库，可以在 Python 长循环中添加一个进度提示信息用法：tqdm(iterator)

# 方法1：
import time
from tqdm import tqdm  

for i in tqdm(range(100)):
    time.sleep(0.01)

方法2：
import time
from tqdm import trange

for i in trange(100):
    time.sleep(0.01)

　　

结果：

 0%|          | 0/100 [00:00<?, ?it/s]
 11%|█         | 11/100 [00:00<00:00, 100.00it/s]
 22%|██▏       | 22/100 [00:00<00:00, 100.00it/s]
 32%|███▏      | 32/100 [00:00<00:00, 100.00it/s]
 43%|████▎     | 43/100 [00:00<00:00, 100.00it/s]
 54%|█████▍    | 54/100 [00:00<00:00, 100.00it/s]
 64%|██████▍   | 64/100 [00:00<00:00, 99.11it/s]
 74%|███████▍  | 74/100 [00:00<00:00, 99.37it/s]
 85%|████████▌ | 85/100 [00:00<00:00, 99.56it/s]
 95%|█████████▌| 95/100 [00:00<00:00, 99.69it/s]
100%|██████████| 100/100 [00:01<00:00, 99.70it/s]

可以为进度条设置描述：

import time
from tqdm import tqdm

pbar = tqdm(["a", "b", "c", "d"])
for char in pbar:
    # 设置描述
    pbar.set_description("Processing %s" % char)
    time.sleep(1)

　　

结果：

0%|          | 0/4 [00:00<?, ?it/s]
Processing a:  25%|██▌       | 1/4 [00:01<00:03,  1.00it/s]
Processing b:  50%|█████     | 2/4 [00:02<00:02,  1.00it/s]
Processing c:  75%|███████▌  | 3/4 [00:03<00:01,  1.00it/s]
Processing d: 100%|██████████| 4/4 [00:04<00:00,  1.00it/s]

import time
from tqdm import tqdm

# 一共200个，每次更新10，一共更新20次
with tqdm(total=200) as pbar:
  for i in range(20):
    pbar.update(10)
    time.sleep(0.1)

#方法2：
pbar = tqdm(total=200)
for i in range(20):
    pbar.update(10)
    time.sleep(0.1)
# close() 不要也没出问题？
pbar.close()

结果：

  0%|          | 0/200 [00:00<?, ?it/s]
 15%|█▌        | 30/200 [00:00<00:01, 150.00it/s]
 25%|██▌       | 50/200 [00:00<00:01, 130.43it/s]
 30%|███       | 60/200 [00:00<00:01, 119.52it/s]
 40%|████      | 80/200 [00:00<00:01, 112.91it/s]
 50%|█████     | 100/200 [00:00<00:00, 108.70it/s]
 55%|█████▌    | 110/200 [00:01<00:00, 105.93it/s]
 65%|██████▌   | 130/200 [00:01<00:00, 104.08it/s]
 75%|███████▌  | 150/200 [00:01<00:00, 102.82it/s]
 80%|████████  | 160/200 [00:01<00:00, 101.96it/s]
 85%|████████▌ | 170/200 [00:01<00:00, 96.38it/s]
 90%|█████████ | 180/200 [00:01<00:00, 97.44it/s]
100%|██████████| 200/200 [00:01<00:00, 98.19it/s]

更多用法，学习完后再补充：
https://blog.csdn.net/langb2014/article/details/54798823?locationnum=8&fps=1