Elevator System - Python

Problem Solved:

• An elevator system, which can be initialized with n elevator.

• When provided input as below, it processes each request, based on simple cost functions.

• Input can be edited in ./code/run.py.

• Each elevator has below capabilites :

  • Move Up and Down
  • Open and Close Door
  • Start and Stop Running
  • Display Current Status
  • Decide weather to move up or down, given a list of request

• Elevator System takes care of :

  • Creation of system with an array of objects of elevator.
  • Decides which lift to associate which floor.
  • Marks which elevator is available or busy.
  • Can mark which elevator is operational and which is not.

ASSUMPTION:

• Elevator System has got only one button per elevator outside the elevator.

• So if there are a total of 5 elevators, there will be 5 buttons.

• Note that, this dosent not mimic real world, when you would have a total of 10 buttons for 5 elevators ( one for up and one for down)

• Once the elevator reaches its called point, then based on what floor is requested, it moves either up or down.

How to Run:

1. [OPTIONAL] - Create and activate a python3 virtualenv.

2. Install requirements mentioned in req.txt :

   pip install -r req.txt

3. Change directory to code :

   cd code

4. [OPTIONAL] - Change the params in ./code/run.py

5. python run.py

Imporvements:

1. Error handling could be improved.

2. Take input from user / config file rather than hardcoding it.

3. Enhance system to have better cost functions.

Default Input Details :

1. active_floors = [5,-2,7,9,10, 9, 12, -1] - List of floors on which button outside elevator was pressed.

2. lift_positions = [9,10,5,0,4] - Current elevator postion, this represents 5 elevator currently standing @ floor 9, 10, 5, 0 and 4.

3. no_of_lifts, floor_min, floor_max = 5, -4, 20 - Number of lifts in the system, min floor, max floor

4. request_each = [[-3,12, 8, 6 ,4 ,0, 5], [-3,0, 5], [4,0, 5], [8, 6 ,4 ,0, 5], [2,4,8,10,12]]

A 2d list to mimic buttons pressed / request to go in each elevator.

Output of Default Input:

• [Output cropped].