binascii.b2a_hex(binary_value) ##binary_value 一般读二进制文件可以得到 
 
>>'89' <type str> 

bin(10) 
 
>> '0b1010' <type, str> 

oct(10) 
 
>>'012' <type, str> 

hex(20) 
 
>>'0x14' <type, str> 

int('20') 
>>20 <type, int> 
int('10', 2) 
>>2 <type, int> 
int('10', 8) 
>>8 <type, int> 
int('20', 10) 
>>20 <type, int> 
int('20',16) 
>>32 <type, int> 

chr(65) 
 
>>'A', <type, str> 

ord('a') 
 
>>97, <type, int> 

#!/usr/bin/env python  
#encoding: utf-8 
import binascii  
 
fh = open(r'C:Tempimg2012517165556.png', 'rb') 
a = fh.read() 
#print 'raw: ',`a`,type(a) 
hexstr = binascii.b2a_hex(a) #得到一个16进制的数 
#print 'hex: ',hexstr, type(hexstr) 
bsstr = bin(int(hexstr,16))[2:] 
print 'bin: ',bsstr, type(bsstr)