hashlib 加密 与进度条

# 加密
'''
md5 = hashlib.md5()
md5.update('how to use md5 in python hashlib?')  #字节才可以 
print md5.hexdigest()
'''
进度条
=========知识储备==========
进度条的效果
[#             ]
[##            ]
[###           ]
[####          ]

指定宽度
print('[%-15s]' %'#')
print('[%-15s]' %'##')
print('[%-15s]' %'###')
print('[%-15s]' %(15*'#'))

打印%
print('%s%%' %(100)) #第二个%号代表取消第一个%的特殊意义

可传参来控制宽度
print('[%%-%ds]' %50) #[%-50s]
print(('[%%-%ds]' %50) %'#')
print(('[%%-%ds]' %50) %'##')
print(('[%%-%ds]' %50) %'###')


=========实现打印进度条函数==========
import sys
import time

def progress(percent,width=50):
    if percent >= 1:
        percent=1
    show_str = ('%%-%ds' % width) % (int(width*percent)*'*')
    # print('
%s %d%%' %(show_str, int(100*percent)), end='')
    print('
%s %d%%' %(show_str, int(100*percent)))
# progress(8,5)

#=========应用==========
data_size=1025
recv_size=0
while recv_size < data_size:
    time.sleep(1) #模拟数据的传输延迟
    recv_size+=1024 #每次收1024

    percent=recv_size/data_size #接收的比例
    progress(percent,width=50) #进度条的宽度70



import sys
import time

def progress(percent,width=50):
    if percent >= 1:
        percent=1
    show_str = ('%%-%ds' % width) % (int(width*percent)*'*')
    print('
%s %d%%' %(show_str, int(100*percent)), end='')
    # print('
%s %d%%' %(show_str, int(100*percent)))


#=========应用==========

data_size=1888
recv_size=0
while recv_size < data_size:
    recv_size+=1024 #每次收1024
    percent=recv_size/data_size #接收的比例
    if percent >= 1:
        percent=1
    show_str = ('%%-%ds' % 50) % (int(50*percent)*'*')
    print('
%s %d%%' %(show_str, int(100*percent)), end='')