1. User can create tasks with:
   Describtion, date, start time, end time
2. User can list tasks, list can be daily or weekly, user selects.
3. User can list available time intervals and occupied time intervals
4. Two or more tasks cannot be assigned to any time intercal. If user tries to add a task to already allocated time, task should be rejected by an exception.
5. Task lists should be saved to / read from disk using pickle
6. Docstrings for classes / methods and functions should be provided
7. Define all getters and setters or properties

I write the code with 0 errors but I cant read the pickle file also I cant printed anything. This is my term project so I need help so much thank you.