Maintaining a list

[Terry Reedy]

"Steve" <dippyd at yahoo.com.au> wrote in message
news:403311F6.2070202 at yahoo.com.au...
> How about using a global variable? Define a variable in
> your main program:
>
> mylist = []
>
> def myroutine(x)
>      global mylist

Stylistic note:
Since the global name mylist is not rebound, this declaration is not
needed.
Since the global name mylist must not be rebound to meet its purpose,
I think the declaration positively should not be present, so it cannot be
rebound,
even by accident.  Documenting the read-only use of a global with a comment
(especially in a much longer function) is a different matter, as with
     # global mylist

>      mylist.append(x)

This mutates the object bound to 'mylist' without changing the binding.

>      print mylist
>      return None

Terry J. Reedy