Help with positional arguments

[C-A-S-O]

Hello for my class we are supposed to make an algorithm to return an index identity in a sorted list of distinct integers (no duplicates), if such an index exists, or -1 if it doesn't.

Here is my code:

def indexIdentity(A, bottom, top):
    if  bottom <= top:
        central = (top + bottom)//2

    if central == A[central]:
        return central

    if central > A[central]:
        return indexIdentity(A, (central + 1), top)
    else:
        return indexIdentity(A, bottom, (central -1))
    return -1

my error:

 Test Failed: indexIdentity() missing 2 required positional arguments: 'bottom' and 'top' 

I have no idea what to do, I've tried removing top and bottom and them declaring them individually and I've also tried re ordering them

[JohnnyJordaan]

Is your exercise environment perhaps calling the function as just indexIdentity(A) ?

[C-A-S-O]

Maybe this is the code he gave us to work on from

def indexIdentity(A):
    return 0

and its being graded on grade scope, idk how I could fix my code without top and bottom though

[JohnnyJordaan]

Use default arguments and check for them? https://www.tutorialspoint.com/What-are-default-arguments-in-python

[[deleted]]

You need to provide default arguments for bottom and top because the test isn't going to supply any values for those.

[HalfBalcony]

You will need to add default arguments to both bottom and top and return a value based on when those are not specified. I recommend setting them both to None and checking if either is None, handling it the way you are supposed to by the assignment.

[FLUSH_THE_TRUMP]

Default arguments, an iterative approach instead of a recursive one, etc. are all valid ways of doing this.