python 显示进度条的方式

import time
import sys
from tqdm import tqdm



def view_bar(num, total):
    rate = float(num) / float(total)
    rate_num = int(rate * 100)
    r = "\r"+("="*(2*rate_num//10)+">")+(" "*(20-2*rate_num//10))+'%d%%' % (rate_num, )
    sys.stdout.write(r)
    sys.stdout.flush() # 刷新缓冲区

def view():
    for e in tqdm([0,1, 2, 3, 4, 5, 6, 7, 8, 9]):
        time.sleep(0.1)





if __name__ == '__main__':
    print("downloading：")
    #第一种
    for i in range(0, 101):
        time.sleep(0.1)
        view_bar(i, 100)
    #第二种
    view()


print("\ndownload successful\n")