Set the Python file maximum line length to 88 characters (#2122)

* flake8 --max-line-length=88

* fixup! Format Python code with psf/black push

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

backtracking/hamiltonian_cycle.py

@@ -16,8 +16,8 @@ def valid_connection(
     Checks whether it is possible to add next into path by validating 2 statements
     1. There should be path between current and next vertex
     2. Next vertex should not be in path
-    If both validations succeeds we return true saying that it is possible to connect this vertices
-    either we return false
+    If both validations succeeds we return True saying that it is possible to connect
+    this vertices either we return False
 
     Case 1:Use exact graph as in main function, with initialized values
     >>> graph = [[0, 1, 0, 1, 0],
@@ -52,7 +52,8 @@ def util_hamilton_cycle(graph: List[List[int]], path: List[int], curr_ind: int)
     Pseudo-Code
     Base Case:
     1. Chceck if we visited all of vertices
-        1.1 If last visited vertex has path to starting vertex return True either return False
+        1.1 If last visited vertex has path to starting vertex return True either
+            return False
     Recursive Step:
     2. Iterate over each vertex
         Check if next vertex is valid for transiting from current vertex
@@ -74,7 +75,8 @@ def util_hamilton_cycle(graph: List[List[int]], path: List[int], curr_ind: int)
     >>> print(path)
     [0, 1, 2, 4, 3, 0]
 
-    Case 2: Use exact graph as in previous case, but in the properties taken from middle of calculation
+    Case 2: Use exact graph as in previous case, but in the properties taken from
+        middle of calculation
     >>> graph = [[0, 1, 0, 1, 0],
     ...          [1, 0, 1, 1, 1],
     ...          [0, 1, 0, 0, 1],