There is no print() method in FunctorCollection

Instead there is str, so I changed the documentation.

added DPA-WP3 lhcb-run3-cleanup labels

requested review from @mferrill

assigned to @pkoppenb

changed title from There is no print() method. to There is no print() method in FunctorCollection

approved this merge request

Thanks Patrick, for changing this into the correct description.

merged

mentioned in commit 53b9168c

BTW, if you have __str__ will it also make sense to have __repr__ as typically the case?