Add multiple Tic-Tac-Toe game implementations and a clock difference calculator

- Implemented a Tic-Tac-Toe game with AI using Minimax algorithm (tic-tac-toe3.py).
- Created a random two-player Tic-Tac-Toe game using NumPy (tic-tac-toe4.py).
- Developed a two-player Tic-Tac-Toe game with full type hints and doctests (tic-tac-toe5.py).
- Added a series of Tic-Tac-Toe games with score tracking (tic-tac-toe6.py).
- Removed outdated Tic-Tac-Toe implementations (TicTacToe.py, tic-tac-toe.py, tic_tak_toe.py).
- Introduced a Tkinter-based clock difference calculator with doctests (Timetable_Operations.py).
- Enhanced leap year checker with doctests and improved input handling (to check leap year.py).

Author: lighting9999

AI Game/Tic-Tac-Toe-AI/tictactoe.py

@@ -0,0 +1,90 @@
+"""
+Text-based Tic-Tac-Toe (2 players).
+
+>>> check_winner([['X','X','X'],[' ',' ',' '],[' ',' ',' ']], 'X')
+True
+>>> check_winner([['X','O','X'],['O','O','O'],['X',' ',' ']], 'O')
+True
+>>> check_winner([['X','O','X'],['O','X','O'],['O','X','O']], 'X')
+False
+>>> is_full([['X','O','X'],['O','X','O'],['O','X','O']])
+True
+>>> is_full([['X',' ','X'],['O','X','O'],['O','X','O']])
+False
+"""
+
+from typing import List
+
+Board = List[List[str]]
+
+
+def print_board(board: Board) -> None:
+    """Print the Tic-Tac-Toe board."""
+    for row in board:
+        print(" | ".join(row))
+        print("-" * 9)
+
+
+def check_winner(board: Board, player: str) -> bool:
+    """Return True if `player` has won."""
+    for i in range(3):
+        if all(board[i][j] == player for j in range(3)) or \
+           all(board[j][i] == player for j in range(3)):
+            return True
+    if all(board[i][i] == player for i in range(3)) or \
+       all(board[i][2 - i] == player for i in range(3)):
+        return True
+    return False
+
+
+def is_full(board: Board) -> bool:
+    """Return True if the board is full."""
+    return all(cell != " " for row in board for cell in row)
+
+
+def get_valid_input(prompt: str) -> int:
+    """Get a valid integer input between 0 and 2."""
+    while True:
+        try:
+            value = int(input(prompt))
+            if 0 <= value < 3:
+                return value
+            print("Invalid input: Enter a number between 0 and 2.")
+        except ValueError:
+            print("Invalid input: Please enter an integer.")
+
+
+def main() -> None:
+    """Run the text-based Tic-Tac-Toe game."""
+    board: Board = [[" " for _ in range(3)] for _ in range(3)]
+    player = "X"
+
+    while True:
+        print_board(board)
+        print(f"Player {player}'s turn:")
+
+        row = get_valid_input("Enter row (0-2): ")
+        col = get_valid_input("Enter col (0-2): ")
+
+        if board[row][col] == " ":
+            board[row][col] = player
+
+            if check_winner(board, player):
+                print_board(board)
+                print(f"Player {player} wins!")
+                break
+
+            if is_full(board):
+                print_board(board)
+                print("It's a draw!")
+                break
+
+            player = "O" if player == "X" else "X"
+        else:
+            print("Invalid move: Spot taken. Try again.")
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()
+    main()