CODEWITHSUNDEEP
python
Hard Tacos
Hard Tacos

Reputation: 370

TypeError: unsupported operand type(s) for -=: 'instance' and 'int'

I am recieving this error multiple times within my code. I it occurring when I am using:

pos -= 1

The error of course is: TypeError: unsupported operand type(s) for -=: 'instance' and 'int'

Any help is appriciated!

def DELETE(pos, lst) :
    temp = FIRST(lst)
    # move to just before pos
    if pos == 0 :
        lst.head = temp.nxt
    elif pos == END(lst) :
        if temp.nxt == None :
            lst = MAKENULL()
        else :
            while (temp.nxt).nxt :
                temp = temp.nxt
            temp.nxt = None
    else :
        while pos - 1 > 0 :
            temp = temp.nxt
            pos -= 1
        first = temp
        second = temp.nxt
        first.nxt = second.nxt
        lst.cur = lst.head

Upvotes: 0

Views: 2544

Answers (1)

Alex Martelli
Alex Martelli

Reputation: 881785

The error you're getting depends only marginally on the code you show -- it's mostly about what pos is -- apparently an instance of an old-style Python 2 class not implementing special methods to try to fake being an integer (in particular, __isub__ for in-place subtraction.

Upvotes: 1

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