md5 = hashlib.md5('adsf')
md5.digest() //返回: '\x05\xc1*(s48l\x94\x13\x1a\xb8\xaa\x00\xd0\x8a' #二进制
md5.hexdigest() //返回: '05c12a287334386c94131ab8aa00d08a' #十六进制
md5.digest()与md5.hexdigest()之间的转换
import binascii
rs = binascii.unhexlify('05c12a287334386c94131ab8aa00d08a')
print rs # print出来的结果就是md5.hexdigest()转换成md5.digest()