零碎知识

print()
print(......,end='
')
****print 自带end=‘
’，默认为换行，可以修改end=‘ ’的值。使print不换行

 1 打印进度条
 2 # print('[                 ]')
 3 # print('[##               ]')
 4 # print('[###              ]')
 5 # print('[####             ]')
 6 # print('[#####            ]')
 7 
 8 
 9 # print('[%-50s]' %'#')
10 # print('[%-50s]' %'##')
11 # print('[%-50s]' %'###')
12 
13 
14 # 第一个%是取消第二个%号的特殊意义的
15 # num=30
16 # print('%s%%' %num)
17 
18 
19 # width=30
20 # print(('[%%-%ds]' %width) %'#')
21 # print(('[%%-%ds]' %width) %'##')
22 # print(('[%%-%ds]' %width) %'###')
23 
24 
25 
26 #######################################
27 import time
28 recv_size = 0
29 total_size = 100000
30 
31 def progress(percent,width=50):
32     if percent > 1:
33         percent =1
34     show_str = ('[%%-%ds]' %width) %(int(width*percent) * '#')
35     print('
%s %d%%' %(show_str,int(100*percent)),end = '')
36 
37 while recv_size < total_size:
38     time.sleep(0.2)
39     recv_size += 8096
40     percent = recv_size / total_size
41     progress(percent)