variable column name

If I return a string variable from a template to a view function, and
the string variable is the name of a model (so I dont know which one
it is) in a known class for a known object in the database, is there
anyway I can change the data for that column without doing a bunch of
if statements trying to figure out which column it actually is. So
for example,
I have t = 'bar' and foo = modelName.objects.get(id = 4)
I want to do something like:
foo.t = "new value" or foo[t] = "new value" (but those dont work).
rather than writing a bunch of if statements like
if t = 'modelfieldone'
...
elif t = 'bar'
...
etc.

Is there anyway to do this?

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