hashlib

• import hashlib
  obj = hashlib .md5("sadsa".encode("utf8"))
  
  obj .update("hello".encode("utf8") )
  
  print(obj.hexdigest())       #5d41402abc4b2a76b9719d911017c592

  import hashlib
  obj = hashlib .md5()  #55a2d393484a551c1cb9d94c92f5de89
  
  obj .update("sadsa".encode("utf8") )                # =obj .update("sadsaroot".encode("utf8") 

  print(obj.hexdigest()) 
  obj .update("root".encode("utf8") ) 
  
  print(obj.hexdigest())                                     #还有SHA256，SH384，SH512算法等