Precision must be a nonnegative integer (#2013)

* Precision must be a nonnegative integer

* fixup! Format Python code with psf/black push

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

data_structures/linked_list/singly_linked_list.py

@@ -106,7 +106,7 @@ class LinkedList:
                 raise IndexError("Index out of range.")
             current = current.next
         current.data = data
-       
+
     def __len__(self):
         """
         Return length of linked list i.e. number of nodes

maths/bailey_borwein_plouffe.py

@@ -39,7 +39,7 @@ def bailey_borwein_plouffe(digit_position: int, precision: int = 1000) -> str:
     if (not isinstance(digit_position, int)) or (digit_position <= 0):
         raise ValueError("Digit position must be a positive integer")
     elif (not isinstance(precision, int)) or (precision < 0):
-        raise ValueError("Please input a nonnegative integer for the precision")
+        raise ValueError("Precision must be a nonnegative integer")
 
     # compute an approximation of (16 ** (n - 1)) * pi whose fractional part is mostly accurate
     sum_result = (