python加入进度条：tqdm 和 progressbar

这里主要是有两个方法：tqdm 和 progressbar

1. 首先是tqdm方法：

from time import sleep
from tqdm import tqdm

for i in tqdm(range(10)):
   # 需要循环或者多次执行的代码
   print('
 the value of i is %d ---'%i)  #正常的整数值：i
   for ii in range(i):
       print(ii)
   sleep(0.1)

• tqdm显示进度条解释：注意参数不一定要是数字，可迭代对象即可

from tqdm import tqdm
import time

for ss in tqdm(range(10)):
    time.sleep(10)
    print('this is test for tqdm with:',ss)

list_ = ['高楼','湖水','大海']  #可迭代对象即可，不一定要数字
for ss in tqdm(list_):
    time.sleep(10)
    print('this is test for tqdm with:', ss)

可以很明显看到：

（1）想看进度，直接看百分比即可，表示完成了多少，例如80%，当然也可以看分数8/10。

（2）第一个时间表示已经执行的时间，第二个时间表示还剩多少时间。

（3）速度：s/it，表示每次迭代需要的时间。

• tqdm函数定义和部分参数

 def __init__(self, iterable=None, desc=None, total=None, leave=True,
                 file=None, ncols=None, mininterval=0.1, maxinterval=10.0,
                 miniters=None, ascii=None, disable=False, unit='it',
                 unit_scale=False, dynamic_ncols=False, smoothing=0.3,
                 bar_format=None, initial=0, position=None, postfix=None,
                 unit_divisor=1000, gui=False, **kwargs):
        """
        Parameters
        ----------
        iterable  : iterable, optional
            Iterable to decorate with a progressbar.
            Leave blank to manually manage the updates.
        desc  : str, optional
            Prefix for the progressbar.
        total  : int, optional
            The number of expected iterations. If unspecified,
            len(iterable) is used if possible. As a last resort, only basic
            progress statistics are displayed (no ETA, no progressbar).
            If `gui` is True and this parameter needs subsequent updating,
            specify an initial arbitrary large positive integer,
            e.g. int(9e9).
        leave  : bool, optional
            If [default: True], keeps all traces of the progressbar
            upon termination of iteration.
......
        bar_format  : str, optional
            Specify a custom bar string formatting. May impact performance.
            [default: '{l_bar}{bar}{r_bar}'], where
            l_bar='{desc}: {percentage:3.0f}%|' and
            r_bar='| {n_fmt}/{total_fmt} [{elapsed}<{remaining}, '
              '{rate_fmt}{postfix}]'
            Possible vars: l_bar, bar, r_bar, n, n_fmt, total, total_fmt,
              percentage, rate, rate_fmt, rate_noinv, rate_noinv_fmt,
              rate_inv, rate_inv_fmt, elapsed, remaining, desc, postfix.
            Note that a trailing ": " is automatically removed after {desc}
            if the latter is empty.
        initial  : int, optional
            The initial counter value. Useful when restarting a progress
            bar [default: 0].
        position  : int, optional
            Specify the line offset to print this bar (starting from 0)
            Automatic if unspecified.
            Useful to manage multiple bars at once (eg, from threads).
        postfix  : dict or *, optional
            Specify additional stats to display at the end of the bar.
            Calls `set_postfix(**postfix)` if possible (dict).
......

使用示例：

list_ = ['高楼','湖水','大海']
for ss in tqdm(list_, desc='---', postfix='***'):
    time.sleep(10)
    print('this is test for tqdm with:', ss)

4. 其次是progressbar方法

from progressbar import ProgressBar, Percentage, Bar, Timer, ETA, FileTransferSpeed

aa = [1,2,3,4,5,6,7,8,9]
total = len(aa)

def dowith_i(i):
    for ii in range(i):  
        print(ii)
        sleep(0.1)
 
widgets = ['当前进度: ',Percentage(), ' ', Bar('=>'),' ', Timer(),
           ' ', ETA(), ' ', FileTransferSpeed()]
bar_object = ProgressBar(widgets=widgets, maxval=10*total).start()
for i in range(total):
    print('
')
    dowith_i(i)  #做自己的任务
    bar_object.update(10 * i + 1)
bar_object.finish()

 其中 'widgets' 参数可以自己设置。

Timer：表示经过的秒（时间）

Bar：设置进度条形状

Percentage：显示百分比进度

ETA：预估剩余时间

FileTransferSpeed：文件传输速度

参考：

https://baijiahao.baidu.com/s?id=1604219346207216803&wfr=spider&for=pc

https://blog.csdn.net/dcrmg/article/details/79525167