Programmatically / Dynamically concatenate parameters to an object to access data

Question

Is it possible to do something like this?

class child:
    def __init__(self):
        self.figure = "Square"
        self.color = "Green"

bot = child()
bot_parameters = ['color', 'figure'] 

[print(bot.i) for i in bot_parameters] #Attribute Error from the print function.

I know I can access the parameter values with __dict__ but I wanted to know if it is possible to concatenate the parameters to programmatically/dynamically get the values.

it is unclear what you expect to achieve. What should be the value for size which is indeed not defined? It's unclear what you mean by concatenate the parameters to programatically/Dynamically get the values — buran
– buran, Commented Jan 21, 2022 at 21:08
for example i can write the code: print(bot.figure) print(bot.color) But my question is if its possible to do something like: for parameter in ['figure', 'color']: print(bot.parameter) — Aldhair Garza
– Aldhair Garza, Commented Jan 21, 2022 at 22:11

martineau · Accepted Answer · 2022-01-23 14:57:26Z

2

You can use the built-in vars() and getattr() functions together and retrieve the class instance's attributes dynamically like this:

class Child:
    def __init__(self):
        self.figure = "Square"
        self.color = "Green"

bot = Child()

print([getattr(bot, attrname) for attrname in vars(bot)])  # -> ['Square', 'Green']

You could also just hardcode ['figure', 'color'], but that's not as "dynamic" and would have to be updated whenever the class' attributes were changed.

edited Jan 23, 2022 at 14:57

answered Jan 21, 2022 at 23:00

martineau

124k29 gold badges181 silver badges319 bronze badges

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

4 Comments

Yaakov Bressler Over a year ago

Wouldn't dot dict get similar results? bot.__dict__?

martineau Over a year ago

@ybressler_simon: In this case, "yes". vars() is more generic and works with objects other than class instances. Also in this case it's less typing and better conveys the intent IMO.

Yaakov Bressler Over a year ago

fair! will look for use cases in my curr work for vars() :)

martineau Over a year ago

@ybressler_simon: Also note that there are other things in __dict__ besides the attributes (which you will have to skip or filter-out some way).

Collectives™ on Stack Overflow

Programmatically / Dynamically concatenate parameters to an object to access data

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related