Program to design parking system in Python

Suppose you want to design a parking system. A parking lot has three different kinds of parking spaces − big, medium, and small. And there are fixed number of slots for each size. Make a class called OurParkingSystem with of two methods −

• constructor(big, medium, small) − This constructor is taking the number of slots available for different spaces and initializes object of the OurParkingSystem class.

• addCar(carType) − This method checks whether there is a parking space of given carType for the car that wants to put inside the parking lot.

The three slots big, medium, or small, are represented by 1, 2, and 3 respectively. The constraint is a car can only park in a parking space if carType is matched. If there is no space available, return false, otherwise park the car in that size space and return true.

If there are 2 spaces for big car, no space for medium car and 1 space for small car, then constructor call will be like OurParkingSystem(2, 0, 1), and if we call addCar like −

addCar(3) − add one small car and return true

addCar(2) − No space to add medium car so return false

addCar(3) − No space to add a new small car so return false

addCar(1) − add one big car and return true

addCar(1) − add another big car and return true

addCar(1) − No space for another big car so return false

To solve this, we will follow these steps −

• Define a function constructor() . This will take big, medium, small

• sp := a list like [0,big,medium,small]

• Define a function addCar() . This will take carType

• if sp[carType] > 0, then

  • sp[carType] := sp[carType] - 1

  • return True

• return False

Example (Python)

Let us see the following implementation to get better understanding −

 Live Demo

class OurParkingSystem:    def __init__(self, big, medium, small):       self.sp = [0,big,medium,small]    def addCar(self, carType):       if(self.sp[carType] >0 ):          self.sp[carType] -= 1          return True       return False ps = OurParkingSystem(2, 0, 1) print(ps.addCar(3)) print(ps.addCar(2)) print(ps.addCar(3)) print(ps.addCar(1)) print(ps.addCar(1)) print(ps.addCar(1))

Input

ps.addCar(3) ps.addCar(2) ps.addCar(3) ps.addCar(1) ps.addCar(1) ps.addCar(1)

Output

True False False True True False