python - Check if a list contains incrementing elements starting from zero

Question

I want to check if a list contains incrementing elements, incremented by one each and starting with 0. So, e.g. [0, 1, 2, 3] should return "valid", whereas e.g. [0, 1, 3, 4] or [-1, 0, 1] should return "not valid".

Is there an easy way to achieve that in Python? Maybe a built-in function?

Answer 1

If the problem is truly as you describe it, this can be solved trivially using range, like so:

myList = [...]
if myList == list(range(myList[-1] + 1)):
    # Do stuff.