get_FOO_display() for generic/variable choice fields

I have a model ContactDetail with two choice fields,
ContactDetail.dialing_code and ContactDetail.country. These use the
standard tuples ('AU', 'Australia') and so on.

I know I can use get_country_display() and get_dialing_code_display()
to show the longer values, but is there a more generic version where
the field name is replaced with a variable?

For example, I want to create a customised .csv file from the model
data. I can loop through the fields from my model and get the shorter
attribute values without any problems. However I'd like to do
something like this:

obj = queryset[my_item] # an instance of ContactDetail()
model = queryset.model # ContactDetail() itself

for field in model._meta.fields:
val = getattr(obj, field.name) # gets the shorter version
if field.choices: # if field is ChoiceField, convert data
to display mode
val = obj.get_field_display()
row.append(val)

Obviously the 'val = obj.get_field_display()' line doesn't work!

Is there a generic way of doing this (something like
obj.get_display(fieldname) ?) or am I going to have to hard code
separate checks for get_country_display() and
get_dialing_code_display()?

Ideally I would like to use this particular function for other models
and keep the fields as generic as possible.

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