1 try: 2 import hashlib 3 _new_md5 = hashlib.md5 4 except ImportError: 5 import md5 6 _new_md5 = md5.new 7 8 def _UnsignedFingerPrintImpl(str, encoding='utf-8'): 9 hex128 = _new_md5(str).hexdigest() 10 int64 = long(hex128[:16], 16) 11 return int64 12 13 14 def UnsignedFingerPrint(str, encoding='utf-8'): 15 return _UnsignedFingerPrintImpl(str, encoding) 16 17 18 def FingerPrint(str, encoding='utf-8'): 19 fp = UnsignedFingerPrint(str, encoding=encoding) 20 # interpret fingerprint as signed longs 21 if fp & 0x8000000000000000L: 22 fp = - ((~fp & 0xFFFFFFFFFFFFFFFFL) + 1) 23 return fp 24 25 def GenerateMessageId(message, meaning=''): 26 fp = FingerPrint(message) 27 if meaning: 28 # combine the fingerprints of message and meaning 29 fp2 = FingerPrint(meaning) 30 if fp < 0: 31 fp = fp2 + (fp << 1) + 1 32 else: 33 fp = fp2 + (fp << 1) 34 # To avoid negative ids we strip the high-order bit 35 #SILVERAEGIS_BEGIN_BEGIN 36 fpid = str(fp & 0x7fffffffffffffffL) 37 return fpid 38 test = GenerateMessageId("Adding to BlackSwan ...") 39 #test = GenerateMessageId('&Show in Finder', "'show in Finder' on Mac in Title Case") 40 print test
文章出处： http://www.cnblogs.com/zhfuliang/archive/2013/05/21/3090938.html