code: def _get_space_character_free_column_resolvers(self):
          
          from pandas.core.computation.common import _remove_spaces_column_name
  
          return {_remove_spaces_column_name(k): v for k, v
                  in self.iteritems()}
docs: Return the space character free column resolvers of a dataframe.
  
          Column names with spaces are 'cleaned up' so that they can be referred
          to by backtick quoting.
          Used in :meth:`DataFrame.eval`.