# Wednesday, April 27, 2016¶

Alexa wants to print a list of the participants of a continous course, together with “invoicing info” and “payment info”.

Excerpts can now be certifying even on a model which is not Certifiable. In that case you don’t have a printed field on the owner, but Lino creates at most one excerpt per database object.

The filename of a certifying non-primary excerpt is courses.Course.12-34.pdf (where 12 is the ID of the excerpt type and 34 the ID of the course).

EnrolmentsAndPaymentsByCourse

>>> from decimal import Decimal
>>> Decimal('45.00') * '1'
Traceback (most recent call last):
...
TypeError: can't multiply sequence by non-int of type 'Decimal'