I have a table with 8 fields. I need to create crud.update form only for 
one of them.

There are at least two ways to do it:

1. setting readable / writable attributes of the rest 7 fields to False 
(rather tedious)

2. or something like this:

for f in db.tablename.fields:
    if f != 'myfield':
        db.tablename.f.writable = db.tablename.f.readable = False

but of course I can't concentrate DAL objects and string like this ;) How 
do I do it properly?

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