http://scipy.github.io/old-wiki/pages/Numpy_Example_List
https://en.wikibooks.org/wiki/Python_Programming/Basic_Math
https://docs.scipy.org/doc/numpy/reference/generated/numpy.log2.html
https://sandilands.info/sgordon/aliases-prompts-and-scripting-in-linux
https://docs.python.org/3/tutorial/index.html
https://www.ics.uci.edu/~brgallar/week2_1.html ###python readfile line.strip()