a) Write down a class definition for a class named City. Each city object must h

Question

a) Write down a class definition for a class named City. Each city object must have four attributes: name, x, y, and pop. The first two should be thought of as the (x, y) coordinates of the city (imagining the city as residing in the xy-plane). The third attribute is meant to represent the city's current population. The City class also needs two methods. First, you must write a FuturePop method which predicts the future population of the city using a basic exponential growth model. Given two inputs r (the rate of growth) and t (the time elapsed from present, in years), the FuturePop method should return the result of (current population) 2.7^rt Second, you must also write a DistanceTo method which takes another city (call it other) as its input and returns the distance from the first city to the second using the Euclidean distance formula: distance from first city to second city = Squareroot (x_1 - x_2)^2 + (y_1 - y_2)^2.

Explanation / Answer

import math
from decimal import Decimal
class City(object):

def __init__(self,x,y,pop):
self.x=x
self.y=y
self.pop=pop

def FuturePop(self,r,t):
return "{:.2E}".format(Decimal(self.pop*2*7)**(r*t))

def DistanceTo(self,other):
return math.sqrt( ((self.x-other.x)**2) +((self.y-other.y)**2) )

c=City(2,3,100)
d=City(4,4,200)
print(c.FuturePop(10,10))
print(c.DistanceTo(d))

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