Puzzled by list-appending behavior

[Ben Finney]

Uncle Ben <bgreen at nycap.rr.com> writes:

> Can someone explain this to me?

Yes, the documentation for that function (‘list.append’) can explain it.

In short: if a method modifies the instance, that method does not return
the instance. This policy holds for the built-in types, and should be
followed for user-defined types also.

-- 
 \      “[I]t is impossible for anyone to begin to learn that which he |
  `\                thinks he already knows.” —Epictetus, _Discourses_ |
_o__)                                                                  |
Ben Finney