TheAlgorithms/Python · error · TypeError

only integers accepted as input

Error message

only integers accepted as input

What it means

remove_digit() in maths/remove_digit.py computes the largest number obtainable by deleting one digit from num. It requires isinstance(num, int) and raises TypeError('only integers accepted as input') otherwise, because it does str(abs(num)) and builds digit-transposition lists — a non-int either breaks str/abs or produces character slices that int() cannot reparse. This function correctly uses TypeError (unlike several siblings that use ValueError).

Source

Thrown at maths/remove_digit.py:25

    >>> remove_digit(152)
    52
    >>> remove_digit(6385)
    685
    >>> remove_digit(-11)
    1
    >>> remove_digit(2222222)
    222222
    >>> remove_digit("2222222")
    Traceback (most recent call last):
    TypeError: only integers accepted as input
    >>> remove_digit("string input")
    Traceback (most recent call last):
    TypeError: only integers accepted as input
    """

    if not isinstance(num, int):
        raise TypeError("only integers accepted as input")
    else:
        num_str = str(abs(num))
        num_transpositions = [list(num_str) for char in range(len(num_str))]
        for index in range(len(num_str)):
            num_transpositions[index].pop(index)
        return max(
            int("".join(list(transposition))) for transposition in num_transpositions
        )


if __name__ == "__main__":
    __import__("doctest").testmod()

View on GitHub (pinned to f5988cc097)

Solutions

1. Convert the value first: remove_digit(int(num)) after confirming it is numeric.
2. Parse and validate strings at the edge (int(text) in try/except ValueError) and pass the int.
3. Catch TypeError (this function's contract) rather than ValueError.

Example fix

# before
remove_digit(form_value)  # TypeError when form_value is '2222222'

# after
remove_digit(int(form_value))

if not isinstance(num, int):
    num = int(num)
remove_digit(num)

def is_strict_int(v) -> bool:
    return isinstance(v, int) and not isinstance(v, bool)

try:
    remove_digit(num)
except TypeError:
    num = int(num)  # this function raises TypeError, unlike siblings

When it happens

Trigger: Calling remove_digit('2222222') or remove_digit('string input'); any call forwarding input() text, a web-parameter string, or a float like 2222222.0 without conversion.

Common situations: Passing request/form values (always strings) directly; JSON data where the number arrived as a string; assuming the function parses text because its doctests show digit strings in error cases.

Related errors

• perfect_cube_binary_search() only accepts integers
• 'float' object cannot be interpreted as an integer
• 'float' object cannot be interpreted as an integer
• iterations must be defined as integers
• All weights must be integers but got weight of type {type(wt

AI-assisted analysis of TheAlgorithms/Python@f5988cc097 (2026-08-14). Data as JSON: /api/errors/055b61233c10f795. Report an issue: GitHub.