CODEWITHSUNDEEP
pythonclass
user122083
user122083

Reputation: 107

How to represent a new part of class in python?

For example say I had a class like this:

class Planet(object):
    def _init_(self, id = 0, name="", mass = 0)
    self.id = id
    self.name = name
    self.mass = mass

Can I write the planet earth like this -

import(whatever)
name=earth
id=1
mass = 5.97219 × 1024 kg

or must planet earth be written in the same way the class does (sorry for my bad formatting, the code for each is combined into one block not separate ones)?

Upvotes: 0

Views: 141

Answers (2)

Adam Smith
Adam Smith

Reputation: 54193

class Planet(object):
    def _init_(self, id = 0, name="", mass = 0)
        self.id = id
        self.name = name
        self.mass = mass

earth = Planet(id=1,name="Earth",mass=5.97219*1024)

Classes are great! Imagine you want your planet to be able to do something, possibly to other planets. How about this?

class Planet(object):
    def __init__(self,id=0,name="",mass=0,population=0)
        self.id = id
        self.name = name
        self.mass = mass
        self.population = population
    def colonize(self,other,size = 1000):
        if not isinstance(other,Planet):
            raise TypeError("You can only colonize other celestial bodies!")
        if not isinstance(size,int):
            raise TypeError("You need a number of people to colonize with")
        self.population -= size
        other.population += size

mercury = Planet(1, "Mercury")
venus = Planet(2,"Venus")
earth = Planet(3,"Earth",5.97219*1024,7000000000)
mars = Planet(4,"Mars")

>>> earth.population
7000000000
>>> mars.population
0
>>> earth.colonize(mars)
>>> earth.population
6999999000
>>> mars.population
1000

Upvotes: 0

WeaselFox
WeaselFox

Reputation: 7380

You need to create an instance of Planet and initialize it:

earth = Planet()
earth.name = "earth"
earth.id = id
earth.mass = 5.97219 × 1024 kg

Upvotes: 1

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