CODEWITHSUNDEEP
python
Ruslan Osipov
Ruslan Osipov

Reputation: 5843

Access instance variable name within class

A little background - I am playing around with pygame, and want to create a dictionary of all Mob class instances' positions.

The way I see it:

human = Mob(pos)
mob_positions = {human : pos}

So every time I call Mob.__init__() I wanted to add a pos to mob_positions dict.

How do I access current instance variable name? Or is it extremely wrong approach?

Upvotes: 0

Views: 428

Answers (3)

Rostyslav Dzinko
Rostyslav Dzinko

Reputation: 40765

You have several ways to solve the problem. One of them is to pass mob_positions dictionary as argument to __init__.

class Mob(object):
    def __init__(self, pos, field=None):
        ...
        if field:
            field[self] = pos

Such notation allows you to place mobs on initialization or not (depending on what you're doing with mobs).

Upvotes: 2

Antimony
Antimony

Reputation: 39451

The current instance variable is simply the first argument to the function. By convention it is named self.

Here's how I'd do things.

class Mob(object):
    def __init__(self, pos, mob_positions):
        self.pos = pos
        mob_positions[self] = pos

Upvotes: 1

orlp
orlp

Reputation: 117691

Any bound method, including __init__, takes at least one parameter, usually named self, which is exactly what you are describing.

class Mob(object):
    def __init__(self, pos):
        mob_positions[self] = pos

Upvotes: 2

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