The new version of flake8 is linting f-strings (#1976)

* The new version of flake8 is linting f-strings

* updating DIRECTORY.md

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

Author: cclauss

DIRECTORY.md

@@ -108,6 +108,7 @@
   * Heap
     * [Binomial Heap](https://github.com/TheAlgorithms/Python/blob/master/data_structures/heap/binomial_heap.py)
     * [Heap](https://github.com/TheAlgorithms/Python/blob/master/data_structures/heap/heap.py)
+    * [Max Heap](https://github.com/TheAlgorithms/Python/blob/master/data_structures/heap/max_heap.py)
     * [Min Heap](https://github.com/TheAlgorithms/Python/blob/master/data_structures/heap/min_heap.py)
   * Linked List
     * [Circular Linked List](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/circular_linked_list.py)
@@ -582,6 +583,7 @@
   * [Heap Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/heap_sort.py)
   * [I Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/i_sort.py)
   * [Insertion Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/insertion_sort.py)
+  * [Iterative Merge Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/iterative_merge_sort.py)
   * [Merge Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/merge_sort.py)
   * [Odd Even Transposition Parallel](https://github.com/TheAlgorithms/Python/blob/master/sorts/odd_even_transposition_parallel.py)
   * [Odd Even Transposition Single Threaded](https://github.com/TheAlgorithms/Python/blob/master/sorts/odd_even_transposition_single_threaded.py)

digital_image_processing/resize/resize.py

@@ -11,7 +11,7 @@ class NearestNeighbour:
 
     def __init__(self, img, dst_width: int, dst_height: int):
         if dst_width < 0 or dst_height < 0:
-            raise ValueError(f"Destination width/height should be > 0")
+            raise ValueError("Destination width/height should be > 0")
 
         self.img = img
         self.src_w = img.shape[1]