1 import sys,time
2
3 for i in range(20):
4 sys.stdout.write("#")
5 sys.stdout.flush()
6 time.sleep(0.1)
7
8 #sys.stdout.write ,表示写到标准输出（屏幕）
9 sys.stdout.flush ,表示每写一个字符就立刻把内存缓冲区的内容刷出来
10 time模块--time.sleep， 表示休眠时间
def progress_bar(self, ret_size, total_size):
'''
显示进度条
ret_size: 已经传输的数据大小
total_size: 文件的总大小
'''
percent_num = int(float(ret_size) / float(total_size) * 100)
chr_num = int(percent_num / 2) * '*'
if percent_num == 100:
per_str = '\r{0}M/{1}M {2}% : {3}\n'.format(int(ret_size / 1048576),
int(total_size / 1048576),
percent_num,
chr_num)
else:
per_str = '\r{0}M/{1}M {2}% : {3}'.format(int(ret_size / 1048576),
int(total_size / 1048576),
percent_num,
chr_num)
print(per_str, end='', flush=True)
