How to specify a field name dynamically

[jack]

I have three tables:
    table1
        |———————|
        |  id  |  f1   |
        |———————|
    table2
        |———————|
        |  id  |  f2   |
        |———————|

    table3
        |———————|
        |  id  |  f3   |
        |———————|


I want define a function to insert records to someone,but I don't know 
how to specify a field name dynamically.
I had a try like this

/    def insert_record(table, field, goods)://
//        return db.insert(table, field=goods//)/
or
/    def insert_record(table, **kv)://
//        return db.insert(table, **kv)/

but it does not works
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