diff --git a/DIRECTORY.md b/DIRECTORY.md
index 1dceb8879..3c066122a 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -131,6 +131,7 @@
     * [Deque Doubly](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/deque_doubly.py)
     * [Doubly Linked List](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/doubly_linked_list.py)
     * [From Sequence](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/from_sequence.py)
+    * [Has Loop](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/has_loop.py)
     * [Is Palindrome](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/is_palindrome.py)
     * [Middle Element Of Linked List](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/middle_element_of_linked_list.py)
     * [Print Reverse](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/print_reverse.py)
@@ -141,6 +142,7 @@
     * [Circular Queue](https://github.com/TheAlgorithms/Python/blob/master/data_structures/queue/circular_queue.py)
     * [Double Ended Queue](https://github.com/TheAlgorithms/Python/blob/master/data_structures/queue/double_ended_queue.py)
     * [Linked Queue](https://github.com/TheAlgorithms/Python/blob/master/data_structures/queue/linked_queue.py)
+    * [Priority Queue Using List](https://github.com/TheAlgorithms/Python/blob/master/data_structures/queue/priority_queue_using_list.py)
     * [Queue On List](https://github.com/TheAlgorithms/Python/blob/master/data_structures/queue/queue_on_list.py)
     * [Queue On Pseudo Stack](https://github.com/TheAlgorithms/Python/blob/master/data_structures/queue/queue_on_pseudo_stack.py)
   * Stacks
@@ -303,7 +305,7 @@
 ## Linear Algebra
   * Src
     * [Lib](https://github.com/TheAlgorithms/Python/blob/master/linear_algebra/src/lib.py)
-    * [Polynom-For-Points](https://github.com/TheAlgorithms/Python/blob/master/linear_algebra/src/polynom-for-points.py)
+    * [Polynom For Points](https://github.com/TheAlgorithms/Python/blob/master/linear_algebra/src/polynom_for_points.py)
     * [Power Iteration](https://github.com/TheAlgorithms/Python/blob/master/linear_algebra/src/power_iteration.py)
     * [Rayleigh Quotient](https://github.com/TheAlgorithms/Python/blob/master/linear_algebra/src/rayleigh_quotient.py)
     * [Test Linear Algebra](https://github.com/TheAlgorithms/Python/blob/master/linear_algebra/src/test_linear_algebra.py)
@@ -518,6 +520,7 @@
     * [Sol2](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_06/sol2.py)
     * [Sol3](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_06/sol3.py)
     * [Sol4](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_06/sol4.py)
+    * [Test Solutions](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_06/test_solutions.py)
   * Problem 07
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_07/sol1.py)
     * [Sol2](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_07/sol2.py)
@@ -648,6 +651,7 @@
 ## Searches
   * [Binary Search](https://github.com/TheAlgorithms/Python/blob/master/searches/binary_search.py)
   * [Double Linear Search](https://github.com/TheAlgorithms/Python/blob/master/searches/double_linear_search.py)
+  * [Double Linear Search Recursion](https://github.com/TheAlgorithms/Python/blob/master/searches/double_linear_search_recursion.py)
   * [Fibonacci Search](https://github.com/TheAlgorithms/Python/blob/master/searches/fibonacci_search.py)
   * [Hill Climbing](https://github.com/TheAlgorithms/Python/blob/master/searches/hill_climbing.py)
   * [Interpolation Search](https://github.com/TheAlgorithms/Python/blob/master/searches/interpolation_search.py)
@@ -655,7 +659,7 @@
   * [Linear Search](https://github.com/TheAlgorithms/Python/blob/master/searches/linear_search.py)
   * [Quick Select](https://github.com/TheAlgorithms/Python/blob/master/searches/quick_select.py)
   * [Sentinel Linear Search](https://github.com/TheAlgorithms/Python/blob/master/searches/sentinel_linear_search.py)
-  * [Simple-Binary-Search](https://github.com/TheAlgorithms/Python/blob/master/searches/simple-binary-search.py)
+  * [Simple Binary Search](https://github.com/TheAlgorithms/Python/blob/master/searches/simple_binary_search.py)
   * [Simulated Annealing](https://github.com/TheAlgorithms/Python/blob/master/searches/simulated_annealing.py)
   * [Tabu Search](https://github.com/TheAlgorithms/Python/blob/master/searches/tabu_search.py)
   * [Ternary Search](https://github.com/TheAlgorithms/Python/blob/master/searches/ternary_search.py)
@@ -689,9 +693,9 @@
   * [Radix Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/radix_sort.py)
   * [Random Normal Distribution Quicksort](https://github.com/TheAlgorithms/Python/blob/master/sorts/random_normal_distribution_quicksort.py)
   * [Random Pivot Quick Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/random_pivot_quick_sort.py)
-  * [Recursive-Quick-Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/recursive-quick-sort.py)
   * [Recursive Bubble Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/recursive_bubble_sort.py)
   * [Recursive Insertion Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/recursive_insertion_sort.py)
+  * [Recursive Quick Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/recursive_quick_sort.py)
   * [Selection Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/selection_sort.py)
   * [Shell Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/shell_sort.py)
   * [Stooge Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/stooge_sort.py)
@@ -703,7 +707,7 @@
   * [Wiggle Sort](https://github.com/TheAlgorithms/Python/blob/master/sorts/wiggle_sort.py)
 
 ## Strings
-  * [Aho-Corasick](https://github.com/TheAlgorithms/Python/blob/master/strings/aho-corasick.py)
+  * [Aho Corasick](https://github.com/TheAlgorithms/Python/blob/master/strings/aho_corasick.py)
   * [Boyer Moore Search](https://github.com/TheAlgorithms/Python/blob/master/strings/boyer_moore_search.py)
   * [Capitalize](https://github.com/TheAlgorithms/Python/blob/master/strings/capitalize.py)
   * [Check Anagrams](https://github.com/TheAlgorithms/Python/blob/master/strings/check_anagrams.py)
diff --git a/linear_algebra/src/polynom-for-points.py b/linear_algebra/src/polynom_for_points.py
similarity index 100%
rename from linear_algebra/src/polynom-for-points.py
rename to linear_algebra/src/polynom_for_points.py
diff --git a/scripts/validate_filenames.py b/scripts/validate_filenames.py
index 01712e8f7..ca4e2c9fc 100755
--- a/scripts/validate_filenames.py
+++ b/scripts/validate_filenames.py
@@ -17,12 +17,17 @@ if space_files:
     print(f"{len(space_files)} files contain space characters:")
     print("\n".join(space_files) + "\n")
 
+hyphen_files = [file for file in filepaths if "-" in file]
+if hyphen_files:
+    print(f"{len(hyphen_files)} files contain space characters:")
+    print("\n".join(hyphen_files) + "\n")
+
 nodir_files = [file for file in filepaths if os.sep not in file]
 if nodir_files:
     print(f"{len(nodir_files)} files are not in a directory:")
     print("\n".join(nodir_files) + "\n")
 
-bad_files = len(upper_files + space_files + nodir_files)
+bad_files = len(upper_files + space_files + hyphen_files + nodir_files)
 if bad_files:
     import sys
 
diff --git a/sorts/recursive-quick-sort.py b/sorts/recursive_quick_sort.py
similarity index 100%
rename from sorts/recursive-quick-sort.py
rename to sorts/recursive_quick_sort.py
diff --git a/strings/aho-corasick.py b/strings/aho_corasick.py
similarity index 100%
rename from strings/aho-corasick.py
rename to strings/aho_corasick.py