parameters: (self)
return_statement: return self.is_nonneg() and self.is_nonpos()
docstring: Is the expression all zero?
docstring_summary: Is the expression all zero?
docstring_tokens: Is the expression all zero?
function: def is_zero(self) -> bool:
          """Is the expression all zero?
          """
          return self.is_nonneg() and self.is_nonpos()
function_tokens: def is_zero ( self ) -> bool : return self . is_nonneg ( ) and self . is_nonpos ( )