Why doesn't python's list append() method return the list itself?

Fri Jul 16 13:40:27 EDT 2010

On 7/13/2010 4:22 AM, Gregory Ewing wrote:
> John Nagle wrote:
>> Arguably, if a function just does a "return",
>> it should be an error to try to use its return value.
>> It's been suggested at least once before that the
> default return value for a function should be some
> special value that raises an exception if you try
> to do anything with it except throw it away.

 Treating that case as an error would be consistent with the
way attribute access works in Python. In Python, attempting
to access a nonexistent attribute raises an exception. In
Javascript, that returns a null. Javascript makes no
distinction between "null" and "nonexistent", but Python
does.
 It's un-Pythonic and inconsistent that functions which
return nothing are considered to return a None object.
				John Nagle