fix python formatting
fix python formatting

cryos/tomviz,OpenChemistry/tomviz,thewtex/tomviz,cjh1/tomviz,OpenChemistry/tomviz,thewtex/tomviz,mathturtle/tomviz,thewtex/tomviz,cryos/tomviz,cjh1/tomviz,cryos/tomviz,OpenChemistry/tomviz,mathturtle/tomviz,OpenChemistry/tomviz,mathturtle/tomviz,cjh1/tomviz