sys.stdout.write()输出不会自动换行，没有end,可用转义字符自行控制

     /n 换行

     /r  回车到本行首，可刷新输出

 如用sys.stdout.write() 和\r实现自定义进度条

import time
import sys

def main():
    j = 0
    for i in range(100):
        j+=1
        sys.stdout.write(‘\r已经上传了%%%d‘ % (j/100*100))
        time.sleep(0.1)
if __name__ == ‘__main__‘:
    main()

已经上传了%100

import time
import sys

for i in range(100):
    a = int((i + 1) / 5)
    b = 20 - a
    # sys.stdout.write(‘\r>>convert image %d/%d‘%(i,b))
    sys.stdout.write(‘\r|%s%s|%d%%‘ % (a * ‘▇‘, b * ‘ ‘, i + 1))
    sys.stdout.flush()
    time.sleep(.1)

|▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇|100%

from tqdm import tqdm 
import time
import sys
for i in tqdm(range(1000)):
    time.sleep(0.01)

100%|██████████| 1000/1000 [00:10<00:00, 91.47it/s]