Command line battleship destroyer game written in python.

Battleship.py

from random import randint
from time import sleep


def replay(ans):
    if ans == "y":
        battleship(aBoard)
    else:
        exit()


def print_board(board):
    for row in board:
        print(" ".join(row))


def battleship(board):

    for i in range(5):
        for j in range(5):
            board[i][j] = "0"

    print_board(board)

    ship_row = randint(0, len(board) - 1)
    ship_col = randint(0, len(board) - 1)
    turn = 1

    while turn <= 5:
        print("Turn {}".format(turn))
        guess_row = int(input("Guess Row: ")) - 1
        guess_col = int(input("Guess Col: ")) - 1
        sleep(.5)
        print("Firing missile...")
        sleep(1)
        
        if guess_row == ship_row and guess_col == ship_col:
            print("Congratulations! You sank my battleship!")
            sleep(1)
            ans = input("Do you want to play again? Enter y for yes or n for no: ")
            replay(ans)
        else:
            if guess_row not in range(5) or \
                    guess_col not in range(5):
                print("Oops, that's not even in the ocean.")
            elif board[guess_row][guess_col] == "X":
                print("You guessed that one already.")
            else:
                print("You missed my battleship!")
                board[guess_row][guess_col] = "X"
                print_board(board)
                turn += 1
                if turn == 6:
                    sleep(1)
                    print("Game Over")
                    sleep(1)
                    print("The battleship was at ({},{})".format(ship_row + 1, ship_col + 1))
                    board[ship_row][ship_col] = "#"
                    print_board(board)
                    sleep(1)
                    ans = input("Do you want to play again? Enter y for yes or n for no: ")
                    replay(ans)


aBoard = []
for x in range(0, 5):
    aBoard.append(["O"] * 5)

battleship(aBoard)