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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 −
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
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