python code snippet

[Shay]

That will behave *almost* the same unless you're modifying M somewhere. Otherwise, you're just replacing x >= 10 with x >= M[i], which will always be M[0] or M[1]. You still have a huge potential for an index error.

If

[L[i] for i in range(2) if x >= M[i] and x < M[i+1]]

creates an empty list, then there won't be an item to index at [0].

What are you trying to accomplish?