(PracticePython) Drawing a gameboard with number of squares based on user input

print_board.py

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

"""
Ask user size of gameboard and print to screen
"""

while True:
    try:
        size = int(input("How many squares on a side?  "))
    except ValueError:
        print("\nEnter a number.\n")
        continue
    break

horz = ' ---'
vert = '|   '

x = ''.join([horz] * size)
y = ''.join([vert] * size)

for i in range(size):
    print("{}\n{}|".format(x, y))
print(x)