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How to show process bar in python
Sometimes when we deal with some time-consuming tasks, we need to show the process bar, there are many ways to do this, the best way is to use the model tqdm;

use tqdm

pip install tqdm
from tqdm import *

for i in tqdm(range(n)):
    print i

use self-create class

save following code as process.py

# -*- coding: UTF-8 -*-

import sys, time

class ShowProcess():
    """
            
                       
    """
    i = 0 #        
    max_steps = 0 #          
    max_arrow = 50 #      
    infoDone = 'done'

    #      ，           
    def __init__(self, max_steps, infoDone = 'Done'):
        self.max_steps = max_steps
        self.i = 0
        self.infoDone = infoDone

    #     ，         i    
    #    [>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]100.00%
    def show_process(self, i=None):
        if i is not None:
            self.i = i
        else:
            self.i += 1
        num_arrow = int(self.i * self.max_arrow / self.max_steps) #       '>'
        num_line = self.max_arrow - num_arrow #       '-'
        percent = self.i * 100.0 / self.max_steps #      ，   xx.xx%
        process_bar = '[' + '>' * num_arrow + '-' * num_line + ']'\
                      + '%.2f' % percent + '%' + '\r' #       ，'\r'          
        sys.stdout.write(process_bar) #          
        sys.stdout.flush()
        if self.i >= self.max_steps:
            self.close()

    def close(self):
        print('')
        print(self.infoDone)
        self.i = 0

if __name__=='__main__':
    max_steps = 100

    process_bar = ShowProcess(max_steps, 'OK')

    for i in range(max_steps):
        process_bar.show_process()
        time.sleep(0.01)

if you need to use it, just

from process import ShowProcess
    max_steps = 100
    process_bar = ShowProcess(max_steps, 'OK')
    for i in range(max_steps):
        process_bar.show_process()
        time.sleep(0.01)