Matplotlib Savefig will NOT overwrite old files
TLDR: The photos WERE being overwritten, but the date was kept the same as the original file, due to a quirk of windows when a folder has lots of photos. Jon’s answer from 10/2/2015 did the trick for me. https://superuser.com/questions/147525/what-is-the-date-column-in-windows-7-explorer-it-matches-no-date-column-from/335901#335901 Basically windows detects lots of pictures in a folder and “optimizes” said folder for pictures. … Read more