How to set a variable as an attribute?

Question

I'm getting error when trying to set variable as an atribute.

parser = argparse.ArgumentParser()

parser.add_argument('--arch', action='store',
                dest='arch', default='alexnet',
                help='Store a simple value') 

args = parser.parse_args()

model = models.args.arch(pretrained=True)

I know models.args.arch prodocues an error but how syntax should looke like to set a variable as an attribute? I could do it with if statements but it would be lot's of code and I guess it's possible in 1 line.

TheoretiCAL · Accepted Answer · 2019-01-02T23:10:03.053

3

You want to access the internal dict to update:

model = models.__dict__[args.arch](pretrained=True)

or using getattr:

 getattr(models, args.arch)(pretrained=True)

edited Jan 02 '19 at 23:10

answered Jan 02 '19 at 20:44

TheoretiCAL

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2

`getattr` would be preferable. `getattr(models, args.arch)(pretrained=True)`. – chepner Jan 02 '19 at 20:56
1

@chepner - could you exaplain why? What's the difference? – Jakub Bielan Jan 02 '19 at 21:39
2

@JakubBielan https://stackoverflow.com/questions/14084897/getattr-versus-dict-lookup-which-is-faster – TheoretiCAL Jan 02 '19 at 23:10
In short, think of `__dict__` as an *implementation* detail of, not an *interface* to, the attributes of an object. – chepner Jan 03 '19 at 13:30

How to set a variable as an attribute?

1 Answers1