fix minor bug in lab3's sample's main()

static/lab3.py

@@ -58,7 +58,7 @@ def main():
 			'size': 9,
 		}
 	# string concatenation, ternary operator
-	print str(pizza1) + ' was ' + 'valid' if valid_pizza(pizza1) else 'invalid'
+	print str(pizza1) + ' was ' + ('valid' if valid_pizza(pizza1) else 'invalid')
 	print pizza2, 'was', 'valid' if valid_pizza(pizza2) else 'invalid'
 	# string formatting
 	print '%s was %s' % (pizza3, 'valid' if valid_pizza(pizza3) else 'invalid')