Issue interface: some minor cleaning up to our Python code.
Issue interface: some minor cleaning up to our Python code.

cellml/libcellml,cellml/libcellml,cellml/libcellml,hsorby/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml