[Tutor] Battleships - Error with blank input

[Sharj Ahmed]

Hi all,

Need some help with my code.

I've written the below code, but need to add some validation in for when
the user inputs nothing.

The blank input for rows and columns causes the application to crash.

Any help would be greatly appreciated!

Here is my code:

"""


*Import random to generate random integers in game"""from random import
randint*













*HIDDEN_BOARD = [["▢"] * 8 for x in range(8)]GUESS_BOARD = [["▢"] * 8 for x
in range(8)]letters_to_numbers = {"A": 0,"B": 1,"C": 2,"D": 3,"E": 4,"F":
5,"G": 6,"H": 7,}board = []*









*def print_board(board):"""Create board for player to guess where to
hit"""print(" A B C D E F G H")row_number = 1for row in board:print("%d |
%s | " % (row_number, " | ".join(row)))row_number += 1*







*print("\n⛴ WELCOME TO BATTLESHIPS ⛴\n")print("YOU HAVE 25 GUESSES TO SINK
5 BATTLESHIPS\n")print("Game Legend:")print("▢ - blank space")print("⊗ -
missed shot")print("♨ - hit ship\n")print_board(board)*









*def create_ships(board):"""Place ships randomly"""for ship in
range(5):(ship_row, ship_column) = (randint(0, 7), randint(0, 7))while
board[ship_row][ship_column] == "♨":(ship_row, ship_column) = (randint(0,
7), randint(0, 7))board[ship_row][ship_column] = "♨"*













*def fire_shot():"""Asking player what row and column to fire their
shot"""row = input("\nEnter ship row 1-8: ")while row not in
"12345678":print("\nPlease enter a valid row")row = input("\nEnter ship row
1-8: \n")column = input("\nEnter ship column A-H: ").upper()while column
not in "ABCDEFGH":print("\nPlease enter a valid column")column =
input("\nEnter ship column A-H: ").upper()return (int(row) - 1,
letters_to_numbers[column])*











*def count_hit_ships(board):"""Count every time the player hits a shipGame
is over when all 5 ships are hit"""count = 0for row in board:for column in
row:if column == "♨":count += 1return count*
































*create_ships(HIDDEN_BOARD)turns = 25while turns >
0:print_board(GUESS_BOARD)(row, column) = fire_shot()if
GUESS_BOARD[row][column] ==
"⊗":print("\n------------------------------------------------")print("You've
already guessed that! Please guess
again")print("------------------------------------------------\n")elif
HIDDEN_BOARD[row][column] ==
"♨":print("\n---------------------------------------")print("GREAT SHOT!
you sunk a
battleship!")print("---------------------------------------\n")GUESS_BOARD[row][column]
= "♨"turns -= 1else:print("\n------------------------")print("Ah unlucky,
you missed!")print("------------------------\n")GUESS_BOARD[row][column] =
"⊗"turns -= 1if count_hit_ships(GUESS_BOARD) ==
5:print("\n------------------------------------------------------")print("\n
CONGRATULATIONS! You've sunk all 5 battleships!
\n")print("------------------------------------------------------\n")breakprint("You
have " + str(turns) + " turns remaining \n")if turns ==
0:print("\n--------------------------------------------")print("\n GAME
OVER! you have 0 turns remaining
\n")print("--------------------------------------------\n")break*

The error message that appears is:
[image: image.png]
Any help would be greatly appreciated!

Thanks!

Sharj