But annotating four million lines of Python code in this way isn’t a straightforward task, here are some of the lesser-known benefits and how Dropbox accomplished the task.

For such a case, a Python program would pass in two Python int types. But even then, you’d have to be careful: those int types would need to be expressable as a 64-bit integer.

However, if you write command line programs in Python, Gooey can help. By leveraging some Python features and a common Python idiom, you can convert a command line program into a GUI with very ...