lyst[:None]

[Jacek Generowicz]

Given that the name lyst refers to a list, I'd like to limit the
number of elements returned by the slice

  lyst[:limit]

by setting the value of limit.

Now, what if I want to include the option of getting all the elements
from the list? Is there a value of limit which would lead to the
desired behaviour?

-1 does not work: the upper limit is exclusive, so the last element is
left out

-0 does not work: it just evaluates to 0

None does not work: subscripts must be integers

Is there a way of doing this on one line?

(Yes, I know I can split it up onto several lines, and probably should
if I want humans to understand the code ...)