I used matplotlib extensively when I was doing research back in school. It even made it into the work I published (after I got ridiculed for using excel to make

I used matplotlib extensively when I was doing research back in school. It even made it into the work I published (after I got ridiculed for using excel to make plots). Being able to pre-process my data with numpy and generate all of my plots automatically via matplotlib calls kept me sane. John's contribution to the Python community was extensive (I don't know of any comparable plotting tools) and won't be forgotten.