Fix argument validation for count_1s_brian_kernighan_method

DIRECTORY.md

@@ -571,6 +571,7 @@
   * [Largest Subarray Sum](maths/largest_subarray_sum.py)
   * [Least Common Multiple](maths/least_common_multiple.py)
   * [Line Length](maths/line_length.py)
+  * [Liouville Lambda](maths/liouville_lambda.py)
   * [Lucas Lehmer Primality Test](maths/lucas_lehmer_primality_test.py)
   * [Lucas Series](maths/lucas_series.py)
   * [Maclaurin Series](maths/maclaurin_series.py)

bit_manipulation/count_1s_brian_kernighan_method.py

@@ -17,16 +17,19 @@ def get_1s_count(number: int) -> int:
     >>> get_1s_count(-1)
     Traceback (most recent call last):
         ...
-    ValueError: the value of input must be positive
+    ValueError: Input must be a non-negative integer
     >>> get_1s_count(0.8)
     Traceback (most recent call last):
         ...
-    TypeError: Input value must be an 'int' type
+    ValueError: Input must be a non-negative integer
+    >>> get_1s_count("25")
+    Traceback (most recent call last):
+        ...
+    ValueError: Input must be a non-negative integer
     """
-    if number < 0:
-        raise ValueError("the value of input must be positive")
-    elif isinstance(number, float):
-        raise TypeError("Input value must be an 'int' type")
+    if not isinstance(number, int) or number < 0:
+        raise ValueError("Input must be a non-negative integer")
+
     count = 0
     while number:
         # This way we arrive at next set bit (next 1) instead of looping