This page tracks porting progress of Python 3. The epic covering the initial port was 

PackageJIRAOwner
baseTim Jenness
pex_exceptionsTim Jenness
utilsTim Jenness
pex_policyTim Jenness
daf_baseTim Jenness
pex_loggingTim Jenness
pex_configTim Jenness
logTim Jenness
ndarrayTim Jenness
daf_persistenceTim Jenness
afwTim Jenness
skymapUnknown User (jmatt)
geomPaul Price
daf_butlerUtilsUnknown User (npease)
psfexDone, no python sourceNate Lust
obs_testRussell Owen
shapeletNate Lust
skypixPaul Price
pipe_baseRussell Owen
db

Andy Salnikov
catAndy Salnikov
mysqlpythonBrian Van Klaveren
display_ds9David Shupe
coadd_utilsRussell Owen
ctrl_eventsSteve Pietrowicz
ctrl_poolPaul Price
ctrl_orcaSteve Pietrowicz
ctrl_provenanceRussell Owen
ctrl_statsSteve Pietrowicz
ctrl_executeSteve Pietrowicz
ctrl_platform_lsst 
ctrl_platform_gordon 
pykg_configTim Jenness
meas_baseRussell Owen
meas_algorithmsNate Lust
meas_extensions_photometryKron 
meas_extensions_simpleShape 
meas_extensions_psfex 
meas_deblender 
meas_extensions_shapeHSM 
meas_astrom 
meas_modelfit 
pipe_tasks 
coadd_chisquaredRussell Owen
esutil 
scisqlBrian Van Klaveren
astrometry_netTim Jenness
ip_isr 
ip_diffim 
datarel 
obs_lsstSim 
obs_subaru 
obs_decam 
obs_sdss 
obs_cfht 
lmfit 
sphgeom 
Qserv