md5 = hashlib.md5('adsf')
md5.digest() //返回: '\x05\xc1*(s48l\x94\x13\x1a\xb8\xaa\x00\xd0\x8a' #二進制
md5.hexdigest() //返回: '05c12a287334386c94131ab8aa00d08a' #十六進制
md5.digest()與md5.hexdigest()之間的轉換
import binascii
rs = binascii.unhexlify('05c12a287334386c94131ab8aa00d08a')
print rs # print出來的結果就是md5.hexdigest()轉換成md5.digest()