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I have a report that generates product labels for a certain recordset. How can I call a python function from my custom module before/after the report has been generated? 

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To answer my own question. Say I want to keep track when a certain record is printed or not:

You can define a new function in the model's .py file:

def set_record_printed(self):
    self.ensure_one()
self.printed = True
self.timestamp_printed = fields.Datetime.now()

Where self will be the record on which you want to execute the function.

Then in the report QWeb template just call that function on each record.

<t t-esc="product.set_record_printed()"/>
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