python search directory
	https://stackoverflow.com/questions/4940032/how-to-search-for-a-string-in-text-files
	https://www.opentechguides.com/how-to/article/python/59/files-containing-text.html
	https://www.reddit.com/r/learnpython/comments/1nomgb/bestfastest_way_to_recursively_search_through/?rdt=64911
