The Python Software Foundation is dropping Python 2.7 support in 1.5 years (Jan 1, 2020) (ref). The major scientific python packages (numpy, pandas, matplotlib, scipy, etc.) are dropping Python 2.7 ...

If you use pvlib-python in a published work, please cite: William F. Holmgren, Clifford W. Hansen, and Mark A. Mikofski. "pvlib python: a python package for modeling ...

Abstract: We describe improvements to the open source PVLIB-Python modeling package. PVLIB-Python provides most of the functionality of its parent PVLIB-MATLAB package and now follows standard Python ...