dnf.callback.Payload.download_size is documented as a method, but is in fact a property.
PR: https://github.com/rpm-software-management/dnf/pull/1402
FEDORA-2019-58c2d3f1aa has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-58c2d3f1aa
dnf-4.2.7-1.fc30, libdnf-0.35.1-1.fc30 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-58c2d3f1aa
FEDORA-2019-672a74d688 has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-672a74d688
dnf-4.2.7-2.fc30, libdnf-0.35.1-2.fc30 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-672a74d688
dnf-4.2.7-2.fc30, libdnf-0.35.1-2.fc30 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.