code: def GetHasher(cls, hasher_name):
      
      hasher_name = hasher_name.lower()
      if hasher_name not in cls._hasher_classes:
        raise KeyError(
            'hasher class not set for name: {0:s}.'.format(hasher_name))
  
      hasher_class = cls._hasher_classes[hasher_name]
      return hasher_class()
docs: Retrieves an instance of a specific hasher.
  
      Args:
        hasher_name (str): the name of the hasher to retrieve.
  
      Returns:
        BaseHasher: hasher.
  
      Raises:
        KeyError: if hasher class is not set for the corresponding name.