Update traveling_salesman.py

Author: kelvins

src/python/traveling_salesman.py

@@ -142,7 +142,7 @@ def main_menu():
  distances = create_distance_matrix(num_cities)
  print_distance_matrix(distances)
  elif choice == "2":
- if 'distances' in locals():
+ if "distances" in locals():
  shortest_path, shortest_distance = traveling_salesman_bruteforce(
  distances
  )