adding the remove digit algorithm

maths/remove_digit.py

@@ -0,0 +1,37 @@
+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()