remove_digit.py

def remove_digit(num: int) -> int:
 """

 returns the biggest possible result
 that can be achieved by removing
 one digit from the given number

 >>> 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()