CODEWITHSUNDEEP
pythonpython-3.xdictionary-comprehension
puchm
puchm

Reputation: 167

Dict comprehension with additional key

I have a dict comprehension that looks like this:

bar = {
    n: n**2
    for n in range(1, 10)
}

Is there any way to add an additional key to the dict in the same expression? I was thinking of something like this:

bar = {
    'foo': 'bar',
    n: n**2
    for n in range(1, 10)
}

This doesn't work though. How can I achieve this? For now I am adding the additional entry manually afterwards but it would be good if I could do it in the same expression.

I know that the use case is not very clear from my example but in my actual code it would make things a lot easier.

Upvotes: 3

Views: 701

Answers (2)

Peter
Peter

Reputation: 306

In python 3.9.0+, the | operator merges two dictionaries

bar = { 'foo': 'bar' } | {
    n: n**2
    for n in range(1, 10)
}

Upvotes: 6

DisappointedByUnaccountableMod
DisappointedByUnaccountableMod

Reputation: 6826

Do it in two operations, e.g.:

bar = {
    'foo': 'bar'
    }
bar.update( 
    {
        n: n**2
        for n in range(1, 10)
    }
)
print( f"{bar=}" )

result:

bar={'foo': 'bar', 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81}

Upvotes: 1

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