Assign multiple values based on key from dictionary python

Question

Please consider this dictionary


dict = {
    "AccessKey": {
        "UserName": "string",
        "AccessKeyId": "string",
        "Status": "Active | Inactive",
        "SecretAccessKey": "string",
        "CreateDate": "datetime(2015, 1, 1)",
    }
}

What would be a way to assign values of the specified keys in one line, to vars?

x, y = dict['AccessKey'][AccessKeyId']['SecretAccessKey']

A solution would be:

x = dict['AccessKey']['AccessKeyId']

y = dict['AccessKey']['SecretAccessKey']

You say "the return" but there is no return in the example.

LaytonGB
– LaytonGB

2021-05-09 17:38:10 +00:00
Commented May 9, 2021 at 17:38 — LaytonGB
– LaytonGB, Commented May 9, 2021 at 17:38

ForceBru · Accepted Answer · 2021-05-09 17:38:15Z

3

Sure:

x, y = map(dict['AccessKey'].__getitem__, ('AccessKeyId', 'SecretAccessKey'))

...but why? Code should aim for readability first. Unless you're doing code-golf, that is.

answered May 9, 2021 at 17:38

ForceBru

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3 Comments

Scilla Over a year ago

are you saying by readability that any programmer should be able to read it and not just people that know the map function? I am not doing code-golf, was just wondering how I'd do it. not experienced enough with python.

ForceBru Over a year ago

@Scilla, I meant that one-liners aren't necessarily easier to read than two or more lines of code. They also aren't necessarily faster or easier to write. They're often fun to write, though, but not necessarily fun to read.

Scilla Over a year ago

i know what you mean by not easy read. probably you're right too when it come to not being faster, unless you really know what you're doing. Anyhow, thanks for sharing.

Andrej Kesely · Accepted Answer · 2021-05-09 17:40:27Z

1

Another solution, using operator.itemgetter:

from operator import itemgetter

dct = {
    "AccessKey": {
        "UserName": "string",
        "AccessKeyId": "string",
        "Status": "Active | Inactive",
        "SecretAccessKey": "string",
        "CreateDate": "datetime(2015, 1, 1)",
    }
}

keys = "AccessKeyId", "SecretAccessKey"
print(itemgetter(*keys)(dct["AccessKey"]))

Prints:

('string', 'string')

answered May 9, 2021 at 17:40

Andrej Kesely

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Comments

Ayush Garg · Accepted Answer · 2021-05-09 17:52:42Z

1

A slightly more readable answer than @ForceBru's:

x, y = (dict['AccessKey'][item] for item in ('AccessKeyId', 'SecretAccessKey'))

which uses generator comprehension instead of map (and avoids the ugly .__getitem__). However, I agree with @ForceBru -

...but why? Code should aim for readability first. Unless you're doing code-golf, that is.

answered May 9, 2021 at 17:52

Ayush Garg

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