Use keys as variables in python

Question

I'm trying to remove the keys from a mongoengine Document in python:

document.update(unset__name=True)
document.update(unset__surname=True)
document.update(unset__dob=True)
...

but instead of the above I would like to loop through them and use a variable, something like:

document.update(unset__<key>=True)

Is this possible?

you can create a dict dynamically and then pass it to document.update — Epsi95
– Epsi95, Commented Jul 12, 2022 at 12:55

Devyl · Accepted Answer · 2022-07-12 12:54:39Z

1

with a map ? you can build it and put as function kwargs

unset_map = {
    "unset_key": True
}
document.update(**unset_map)

answered Jul 12, 2022 at 12:54

Devyl

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1 Comment

unpacking is not necessary

Valentin BOUSSON · Accepted Answer · 2022-07-12 12:57:38Z

0

yes, this is feasible by destructuring a dictionary. For example, like in there:

d = { "p1": 11, "p2": 12}
def f(p1,p2):
    print(f"p1={p1}, p2={p2}")

f(p2=100,p1=10)
f(**d)

In your case, you will simply have to build a dictionnary with all the keys you want to destroy, by building the correct string:

def delete_key(key_name: str):
    d = { f"unset__{key_name}": True }
    document.update(**d)

answered Jul 12, 2022 at 12:57

Valentin BOUSSON

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