parameters: (self)
return_statement: return self._sign == 1
docstring: Return True if self is negative; otherwise return False.
docstring_summary: Return True if self is negative; otherwise return False.
docstring_tokens: Return True if self is negative ; otherwise return False .
function: def is_signed(self):
          """Return True if self is negative; otherwise return False."""
          return self._sign == 1
function_tokens: def is_signed ( self ) : return self . _sign == 1