Python模块详解|tqdm实战应用

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于 2023-11-02 20:39:17 首次发布

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本文详细介绍了Python的tqdm模块如何创建和定制进度条，包括设置标题、进度条长度、后缀信息、总进度、更新频率、单位以及使用上下文管理器等功能。

python模块| tqdm模块详解

基础应用

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

from tqdm import trange
import time
# trange是同样的效果
for i in trange(100):
       time.sleep(0.01)

只需要使用把可迭代对象iterator转化成tqdm对象即可，同样可以进行迭代，同时会在终端打印进度条。

 63%|██████▎   | 63/100 [00:00<00:00, 64.55it/s]
100%|██████████| 100/100 [00:01<00:00, 64.49it/s]

参数

`desc`设置标题内容

from tqdm import tqdm
import time

for i in tqdm(range(100), desc='数字迭代'):
    time.sleep(0.01)

数字迭代:  48%|████▊     | 48/100 [00:00<00:00, 58.71it/s]
数字迭代:  49%|████▉     | 49/100 [00:00<00:00, 64.24it/s]
数字迭代: 100%|██████████| 100/100 [00:01<00:00, 63.87it/s]

`ncols`设置进度条总长度

from tqdm import tqdm
import time

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

100%|██████████| 100/100 [00:01<00:00, 63.66it/s]
100%|█████████████████████████████████████████████████████████████| 100/100 [00:01<00:00, 63.34it/s]
# 这是默认和设置的对比

`postfix`设置进度条显示信息

from tqdm import tqdm
import time

for i in tqdm(range(100),postfix='数字进度条'):
    time.sleep(0.01)

 65%|██████▌   | 65/100 [00:01<00:00, 58.98it/s, 数字进度条]
100%|██████████| 100/100 [00:01<00:00, 60.08it/s, 数字进度条]

`total`设置总共需要达到的进度

from tqdm import tqdm
import time

for i in tqdm(range(100), total=10000):
    time.sleep(0.01)

设置需要达到的进度

  0%|          | 48/10000 [00:00<02:35, 64.16it/s]
  1%|          | 100/10000 [00:01<02:35, 63.54it/s]
# 最后即使完成100次，还行没达到100%

`update`手动更新次数

from tqdm import tqdm
import time

progress = tqdm(range(100), total=10000)
for i in progress:
    time.sleep(0.01)
    progress.update(10)

设置每次执行增加的进度

  4%|▎         | 350/10000 [00:00<00:14, 647.21it/s]
  9%|▊         | 855/10000 [00:01<00:11, 766.10it/s]
  1%|          | 100/10000 [00:01<02:33, 64.66it/s]  
# 执行完还是会回到实际的进度占比

`unit`设置单位

from tqdm import tqdm
import time

progress = tqdm(range(100), unit='次')
for c in progress:
    time.sleep(0.2)

 26%|██▌       | 26/100 [00:05<00:15,  4.91次/s]
 59%|█████▉    | 59/100 [00:12<00:08,  4.81次/s]
 67%|██████▋   | 67/100 [00:13<00:06,  4.82次/s]
 76%|███████▌  | 76/100 [00:15<00:05,  4.78次/s]
 85%|████████▌ | 85/100 [00:17<00:03,  4.88次/s]

方法

可以使用`with`作为上下文管理器

from tqdm import tqdm
import time

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

 63%|██████▎   | 63/100 [00:00<00:00, 64.55it/s]
100%|██████████| 100/100 [00:01<00:00, 64.49it/s]

`set_description`设置查看每次处理的数据

from tqdm import tqdm
import time

progress = tqdm(range(100))
for c in progress:
    time.sleep(0.2)
    progress.set_description(f"The number is {c}  ")

set_description即可在进度条前面展示目前进行操作的数据

The number is 5  :   6%|▌         | 6/100 [00:01<00:19,  4.91it/s]
The number is 51  :  52%|█████▏    | 52/100 [00:10<00:09,  4.84it/s]
The number is 63  :  64%|██████▍   | 64/100 [00:13<00:07,  4.83it/s]
The number is 75  :  76%|███████▌  | 76/100 [00:15<00:04,  4.89it/s]
The number is 99  : 100%|██████████| 100/100 [00:20<00:00,  4.87it/s]

set_postfix设置进度条显示信息

import random

from tqdm import tqdm
import time

progress = tqdm(range(100))
for c in progress:
    time.sleep(0.2)
    progress.set_postfix(rand=random.random(), title='数字标题栏')

 39%|███▉      | 39/100 [00:07<00:12,  4.94it/s, rand=0.282, title=数字标题栏]
 51%|█████     | 51/100 [00:10<00:09,  4.94it/s, rand=0.475, title=数字标题栏]
 66%|██████▌   | 66/100 [00:13<00:06,  4.92it/s, rand=0.171, title=数字标题栏]

`write`输出信息

import random

from tqdm import tqdm
import time

progress = tqdm(range(100))
for c in progress:
    time.sleep(0.2)
    progress.set_postfix(rand=random.random(), str='数字标题栏')
    tqdm.write(f'输出信息: {c}')

  1%|          | 1/100 [00:00<00:20,  4.89it/s, rand=0.4, str=数字标题栏]输出信息: 0
  2%|▏         | 2/100 [00:00<00:19,  4.94it/s, rand=0.4, str=数字标题栏]输出信息: 1
  4%|▍         | 4/100 [00:00<00:19,  4.90it/s, rand=0.488, str=数字标题栏]输出信息: 3
 27%|██▋       | 27/100 [00:05<00:14,  4.94it/s, rand=0.496, str=数字标题栏]输出信息: 26