Python Jobs-Multilevel menu

Practice Python Multi-level menu reading function, is actually the list or the dictionary of ITER

Functional Requirements:

1. Run the program output first level menu

2. Select a Level menu item, output Level Two menu, the same output level three menu

3. The menu data is saved in the file

4. Let the user choose whether or not to exit

5. There is a function to return to the top level menu

Here is a simple version of:
By gradually iterating through the list, you can actually see that there are a lot of duplicate code. Like every time.
Iterative Menu_dict[choice]..

The Literary youth edition is actually the thing that has been reused for a long time, and then re-assigns it to men_dict after each selection.

Python Jobs-Multilevel menu