code: def get_hash(self, length=HASH_LENGTH):
          
  
          data_hash = ""
          if not self.data_str:
              return data_hash
  
          encoded_data_str = self.data_str
          if sys.version_info.major == 2:
              # In Py2, only unicode needs to be encoded.
              if isinstance(self.data_str, unicode):
                  encoded_data_str = self.data_str.encode('utf-8')
          else:
              # data_str should always be unicode on python 3
              encoded_data_str = self.data_str.encode('utf-8')
  
          data_hash = hashlib.sha1(encoded_data_str).hexdigest()
  
          return data_hash[:length]
docs: Generate and return a hash of data that can be used as suffix of logicalId
  
          :return: Hash of data if it was present
          :rtype string