learn python.org https://www.learnpython.org/en/Hello%2C_World%21
How do I read a file line by line into a list https://stackoverflow.com/questions/3277503/how-do-i-read-a-file-line-by-line-into-a-list
python-reference http://python-reference.readthedocs.io/en/latest/intro.html
extracing extension from filename in Python https://stackoverflow.com/questions/541390/extracting-extension-from-filename-in-python/
command line arguments in Python https://stackoverflow.com/questions/1009860/command-line-arguments-in-python
turorial point https://www.tutorialspoint.com/python/python_functions.htm
delete final line in file with Python https://stackoverflow.com/questions/1877999/delete-final-line-in-file-with-python
convert list to string with space in Python https://stackoverflow.com/questions/12309976/convert-list-into-string-with-spaces-in-python
converting a float to a string without rounding it https://stackoverflow.com/questions/1317558/converting-a-float-to-a-string-without-rounding-it
how to convert list to string https://stackoverflow.com/questions/5618878/how-to-convert-list-to-string
Data types and conversion http://www.pitt.edu/~naraehan/python2/data_types_conversion.html
shortcut keys for commenting out lines of python in spyder https://stackoverflow.com/questions/36644144/shortcut-key-for-commenting-out-lines-of-python-code-in-spyder
while loop with f.readline() https://mail.python.org/pipermail/python-list/2001-February/105300.html
More control flow tools https://docs.python.org/2/tutorial/controlflow.html
python, how to split a string https://www.mkyong.com/python/python-how-to-split-a-string/
reading and writing files https://docs.python.org/2/tutorial/inputoutput.html#reading-and-writing-files