I am looking for creating custom Python callable function that would be use in raw SQL queries, very same to Connection.create_function() <https://docs.python.org/2/library/sqlite3.html#connection-objects> which is perfectly working as I intend. I would like to be able to do it in SQLAlchemy in any Database engine. I understood that sqlalchemy.sql.functions.Function class should come to hand in this regard. I do not understand how to use it though. I miss some example on that.
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