Python FileNotFound

Question

I am fairly new to python.

I am trying to make a script that will read sudoku solutions and determent if they are correct or not.

Things I need:

1] Prompt the user to enter a file/file path which includes the sudoku numbers. Its a .txt file of 9 rows and columns. Consist only of numbers.

2] Have some kind of an error handling.

3] Then, if the sudoku is valid, i should create a new text file using the same format as the original input file with the prefix "Correct_"

I have not fully finished the program, but I get this error when I put a false path or file name.

 Hello to Sudoku valitator,

 Please type in the path to your file and press 'Enter': example.txt #This is a non existing file, to test the Error Exception
    'Traceback (most recent call last):
  File "C:/Users/FEDROS/Desktop/bs.py", line 9, in <module>
    sudoku = open(prompt, 'r').readlines()
FileNotFoundError: [Errno 2] No such file or directory: 'example.txt'

Here is my script:

while True:
    try:
        prompt = input("\n Hello to Sudoku valitator,"
    "\n \n Please type in the path to your file and press 'Enter': ")
        break
    except (FileNotFoundError, IOError):
        print("Wrong file or file path")

sudoku = open(prompt, 'r').readlines()

def check(game):
    n = len(game)
    if n < (1):
        return False

    for i in range(0, n):
        horizontal = []
        vertical = []
        for k in range(0, n):

            if game[k][i] in vertical:
                return ("File checked for errors. Your options are wrong!")
            vertical.append(game[k][i])

            if game[i][k] in horizontal:
                return ("File checked for errors. Your options are wrong!")
            horizontal.append(game[i][k])
    return ("File checked for errors. Your options are correct!")

print (check(sudoku))

Thanks, any advice or help will be appreciated.

Answer 1

try block should be around open. Not around prompt.

while True:
    prompt = input("\n Hello to Sudoku valitator,"
    "\n \n Please type in the path to your file and press 'Enter': ")
    try:
        sudoku = open(prompt, 'r').readlines()
    except FileNotFoundError:
        print("Wrong file or file path")
    else:
        break