queston about locking

[Ottavio Campana <ottavio(at)campana(dot)vi(dot)it>]

I'm writing a python script to update some tables in a db. My problem is
that I need to lock a couple of tables, perform several operations and
read the corresponding output.

I was thinking about lock in exclusive mode, but in the documentation I
found that it is valid only in a transaction. But since I need to
execute a command and read the output and so forth, I think I cannot use
a transaction.

What would you use to lock the table?

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