Python Create unknown number of attribute in a class

Question

I have the following code. I would like to know how I can create an as many attribute for the object labyrinth that I have robot. I have two doubts, how to create the attribute and how to call the function. Anyone ? :)

class Robot:

    """Class that represents a robot."""

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


class Labyrinth:

    """Class that represents a labyrinth."""

    def __init__(self, obstacles, *args):
        self.grid = {}
        for robot in args:  # First doubt
            self.robot.name = [robot.x, robot.y]  # First doubt


robot_1 = Robot(robot_1, 5, 6)
robot_2 = Robot(robot_2, 8, 9)
...
...
...
# unkown number of robots...

labyrinth = Labyrinth(obstacles, ......)  # Second doubt

You should create a list of robots instead of one attribute per robot. — TwistedSim
– TwistedSim, Commented Apr 30, 2018 at 16:08
Can you develop a little bit ? Do you mean to create a list that will contain all my robot and then loop on this list ? Thank you. (At first, it was my idea but I had difficulty to implement it. — Theo
– Theo, Commented Apr 30, 2018 at 16:10
Sorry wrong translation from french to english. I corrected it. I will pay more attention next time. — Theo
– Theo, Commented Apr 30, 2018 at 16:15

TwistedSim · Accepted Answer · 2018-04-30 16:17:50Z

1

First option, using a list to store the robots:

 class Labyrinth:
    def __init__(self, obstacles, robots):
        self.robots = robots

labyrinth = Labyrinth(obstacles, [robot1, robot2])

Second option, using args (renamed to robots for convenience):

 class Labyrinth:
    def __init__(self, obstacles, *robots):
        self.robots = robots

labyrinth = Labyrinth(obstacles, robot1, robot2)

Then, you can access each robot's name with labyrinth.robots[i].name where i is the index of the robot you want.

If you really want to use dynamic attributes, you can do the following:

class A:    
    def __init__(self, *args):
        for idx, arg in enumerate(args):
            setattr(self, 'arg_' + str(idx), arg)

a = A(1,2,3,4)
print(a.arg_0, a.arg_1, a.arg_2, a.arg_3) # print "1 2 3 4"

but I suggest you to not use that.

edited Apr 30, 2018 at 16:17

answered Apr 30, 2018 at 16:11

TwistedSim

2,06011 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Python Create unknown number of attribute in a class

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related