parameters: (mapping, iterable)
docstring: Tally elements from the iterable.
docstring_summary: Tally elements from the iterable.
docstring_tokens: Tally elements from the iterable .
function: def _count_elements(mapping, iterable):
      'Tally elements from the iterable.'
      mapping_get = mapping.get
      for elem in iterable:
          mapping[elem] = mapping_get(elem, 0) + 1
function_tokens: def _count_elements ( mapping , iterable ) : mapping_get = mapping . get for elem in iterable : mapping [ elem ] = mapping_get ( elem , 0 ) + 1