parameters: (docstring)
return_statement: return docstring.split('\n')[0] if docstring else ''
docstring: Return summary of docstring.
docstring_summary: Return summary of docstring.
docstring_tokens: Return summary of docstring .
function: def docstring_summary(docstring):
      """Return summary of docstring."""
      return docstring.split('\n')[0] if docstring else ''
function_tokens: def docstring_summary ( docstring ) : return docstring . split ( '\n' ) [ 0 ] if docstring else ''