Some board drawing function in text

board.py

#!/usr/bin/env python3


def draw_board(width, length):

    for x in range(length):
        print(" ---" * width + " ")
        print("|   " * width + "|")
    print(" ---" * width + " ")


def validate_size(width):

    try:
        width = int(width)
        return width

    except ValueError as e:
        if not width:
            print("Boardsize can't be empty.")
            exit(1)
        else:
            print("Boardsize is not a valid integer.\n\n" +
                  "Run the program again to solve this\n\n")
            exit(1)


def main():

    width = input("Enter a single number for the boardsize: ")
    width = validate_size(width)
    length = width

    draw_board(width, length)


if __name__ == '__main__':
    main()