Notice that that is between a pair of triple quotes (and github even syntax highlights it in a different color). It's all string, more specifically a docstring

Notice that that is between a pair of triple quotes (and github even syntax highlights it in a different color). It's all string, more specifically a docstring (see https://en.wikipedia.org/wiki/Docstring https://en.wikipedia.org/wiki/Docstring ). They are also used in other languages, including Python.