Dynamically reference member of array

[Ben Collier]

Hi all,

I know that I can dynamically reference a variable with locals()["i"], for instance, but I'd like to know how to do this with a variable in an object.

If I have an object called "device", with variables called attr1, attr2 .. attr50, how could I dynamically reference these?

It's fairly academic, but I'd like to avoid code duplication.

Thanks,

Ben

 

[Ben Collier]

Sorry, subject was wrong. Please see below:

 

[Ian Kelly]

Sorry, subject was wrong. Please see below:

Hi all,
I know that I can dynamically reference a variable with locals()["i"],

for instance, but I'd like to know how to do this with a variable in an
object.
You want to access object "attributes", not "variables". You can do this
using the functions getattr and setattr like so:
42

 

[Steven D'Aprano]

You want to access object "attributes", not "variables".

In fairness to the OP, the terminology "instance variables" meaning
attributes or members of an instance is (sadly, in my opinion) common in
some other languages, such as Java, and occasionally creeps into even the
Python docs.

I've often ranted about this, and won't repeat it now, only point out
that the preferred and most common terminology in Python circles is
"attribute", or "instance attribute" if you need to distinguish it from
"class attribute".

 

[R. Michael Weylandt]

Hi all,

I know that I can dynamically reference a variable with locals()["i"], for instance, but I'd like to know how to do this with a variable in an object.

If I have an object called "device", with variables called attr1, attr2 .. attr50, how could I dynamically reference these?

I think the pythonic term you're looking for is "attribute". See
getattr() and setattr()

Cheers,
Michael