CODEWITHSUNDEEP
python
user3474154
user3474154

Reputation:

Python constructors with default values?

So, my assignment is to create a Ship class that has the attributes 'name' and 'fuel.' The name should have a default value of "Enterprise" and the fuel should have a default of 0. And I have to create a object with no parameters, each single parameter, and with both. The only one that's not working is the one with only the fuel and I'm not sure why.

Here's my code:

class Ship(object):

    def __init__(self, name = "Enterprise", fuel = 0):
        self.name = name
        self.fuel = fuel

    def status(self):
        if self.fuel < 0:
            self.fuel = 0
        print self.name, "\nFuel:", self.fuel, "\n"

#main

ship1 = Ship()
ship1.status()
ship2 = Ship("Space Ship1")
ship2.status()
ship3 = Ship(10)
ship3.status()
ship4 = Ship("Space Ship2", 10)
ship4.status()

And here's what it's outputting:

Enterprise 
Fuel: 0 

Space Ship1 
Fuel: 0 

10 
Fuel: 0 

Space Ship2 
Fuel: 10

The third one is printing the fuel as the name and defaulting the fuel to 0 which isn't right. How can I fix it?

Upvotes: 1

Views: 2326

Answers (1)

Hyperboreus
Hyperboreus

Reputation: 32429

In ship3 = Ship(10) the first parameter 10 is the name of the ship.

You might want to use ship3 = Ship(fuel=10).

Not directly related, but important nevertheless. Remember that if you use mutable objects as default arguments (which you don't in your example), those are evaluated once and not for each call.

Upvotes: 7

Related Questions