Update deficient_numbers.py

Author: ArunKishoreVoleti

maths/special_numbers/deficient_numbers.py

@@ -5,7 +5,6 @@
 Examples of Deficient Numbers: 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, ...
 """
 
-
 def is_deficient_number(number: int) -> bool:
     """
     This function takes an integer number as input.
@@ -34,22 +33,21 @@ def is_deficient_number(number: int) -> bool:
         ...
     TypeError: Input value of [number=8.0] must be an integer
     """
+
     if not isinstance(number, int):
         msg = f"Input value of [number={number}] must be an integer"
         raise TypeError(msg)
     if number < 1:
         return False
 
-    divisor_sum = 1  # 1 is always a proper divisor
+    divisor_sum = 1
     for i in range(2, int(number**0.5) + 1):
         if number % i == 0:
             divisor_sum += i
             if i != number // i:
                 divisor_sum += number // i
     return divisor_sum < number
 
-
 if __name__ == "__main__":
     import doctest
-
     doctest.testmod()