What does it mean ** in Django update query?

Asked Oct 23 '19 at 11:07

Active Oct 23 '19 at 11:07

Viewed 57 times

Currently I am working on old project developed in python 2.7 & django 1.9.13 & during development I have found below kind of code.

from django.contrib.contenttypes.models import ContentType
model_type = ContentType.objects.get(app_label=app_name, model=model_name)
model_type.model_class().objects.filter(id=10).update(**{'emp_comment': 'hello'})

I have read about ContentType & know how it works but still not have much clear ideas but what I am not able to figure out is **{'emp_comment': 'hello'}.

I have search online for such kind of syntax but not able to find so anyone have idea how above code works ?

asked Oct 23 '19 at 11:07

Moon

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dictionary unpacking – Diptangsu Goswami Oct 23 '19 at 11:08
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`f(**{'a': 4})` is equivalent to `f(a=4)`. – Willem Van Onsem Oct 23 '19 at 11:09
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@WillemVanOnsem , so what is benefit using ** because using ` 'emp_comment'='hello' ` looks much easier ! – Moon Oct 23 '19 at 11:28
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@Moon: here, nothing. Usually it is done when you do not know in advance the names of the parameters. So you create a dictionary, pass some key-value pairs, and then call it with double asterisk. – Willem Van Onsem Oct 23 '19 at 11:29

What does it mean ** in Django update query?

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