code: def omit(keys, from_, strict=False):
      
      ensure_iterable(keys)
      ensure_mapping(from_)
  
      if strict:
          remaining_keys = set(iterkeys(from_))
          remove_subset(remaining_keys, keys)  # raises KeyError if necessary
      else:
          remaining_keys = set(iterkeys(from_)) - set(keys)
  
      return from_.__class__((k, from_[k]) for k in remaining_keys)
docs: Returns a subset of given dictionary, omitting specified keys.
  
      :param keys: Iterable of keys to exclude
      :param strict: Whether ``keys`` are required to exist in the dictionary
  
      :return: Dictionary filtered by omitting ``keys``
  
      :raise KeyError: If ``strict`` is True and one of ``keys`` is not found
                       in the dictionary
  
      .. versionadded:: 0.0.2