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Off-Topic Discussion => Programming => Topic started by: Locutus of Borg on July 02, 2011, 07:38:46 am

Title: Python Newbie Question - Calling a class' variable from another class
Post by: Locutus of Borg on July 02, 2011, 07:38:46 am

Here's basically how I have it set up

I have a class called World, which has a function called somethingPicked

somethingPicked defines a variable, Position, and then sends a message to the Coin class to execute a function flipCoin

in flipCoin I need to compare the variable Position to the variable r1, which is defined in the coin class.

How do I write it so that I can use the variable position from the World class in a comparison with the variable r1 from the coin class?

Title: Re: Python Newbie Question - Calling a class' variable from another class
Post by: The E on July 02, 2011, 07:47:32 am

DISCLAIMER: I do not know Python

Unless World.Position is publicly accessible, you can't. In most object-oriented languages, you need to declare it as being publicly accessible. See http://en.wikipedia.org/wiki/Object-oriented_programming for pointers.

Title: Re: Python Newbie Question - Calling a class' variable from another class
Post by: Locutus of Borg on July 02, 2011, 12:24:22 pm

I declared it as self.Position and it still didn't work

Title: Re: Python Newbie Question - Calling a class' variable from another class
Post by: Spicious on July 02, 2011, 05:24:04 pm

In Python everything is publicly accessible.

Are you passing your World instance to your flipCoin call? If you don't need anything else from World, why not just pass Position?

Title: Re: Python Newbie Question - Calling a class' variable from another class
Post by: Locutus of Borg on July 02, 2011, 06:06:16 pm

I'm not that familiar with Python. Could you please explain that? :S

I tried calling the variable World.somethingPicked.Position and that didn't work either

Title: Re: Python Newbie Question - Calling a class' variable from another class
Post by: Spicious on July 02, 2011, 06:53:03 pm

Make your flipCoin take a position:

Code: [Select]

def flipCoin(self, position):
  ...

and in somethingPickled

Code: [Select]

coin.flipCoin(position)
or if position is a field in World

Code: [Select]

coin.flipCoin(self.position)


Title: Re: Python Newbie Question - Calling a class' variable from another class
Post by: Locutus of Borg on July 02, 2011, 07:27:03 pm

TypeError: unbound method coinFlip() must be called with Coin instance as first argument (got int instance instead)

Title: Re: Python Newbie Question - Calling a class' variable from another class
Post by: Spicious on July 02, 2011, 07:39:12 pm

Is coin a Coin?

If you want more help, post your code.