[Tutor] Order of unittests

[Peter Otten]

On 16/10/2021 10:43, Albert-Jan Roskam wrote:
>     On 15 Oct 2021 14:53, Peter Otten <__peter__ at web.de> wrote:

>     ===>> Hi Peter,
>     Thank you! That looks quite compact, so I'll give that a try on Monday. I
>     could even use a lambda for my_dir(). I thought dir() was (re)implemented
>     by defining, or in this case injecting, a __dir__ special method?

I should have warned that my my_dir()

>       # shadow the dir() built-in with an order-preserving analogue
>       def my_dir(obj):
>            return list(vars(obj))

is but a sketch that only works in the exact case you gave, i. e. it 
will miss __dir__(), inherited attributes, and probably something I 
can't think of at the moment.

A low-effort improvement that at least will not miss any names might be
to use the built-in dir() to find the names and vars() to partially 
(un)sort them:

# untested
def my_dir(obj):
     names = dir(obj)
     lookup = {n: i for i, n in enumerate(vars(obj))}
     return sorted(names, key=lambda name: lookup.get(name, -1))

I'm sure someone has produced a more thorough implementation -- you just 
have to find it ;)