To comment out a line in Python, we use the # symbol. Start any line with that symbol and it will be treated as a comment.

Pure Python mode also enhances one of Cython’s biggest advantages: It makes it easier to start with a conventional Python codebase and incrementally transform it into C code.

In most languages, Python and C included, the first element of an array is accessed with a zero—e.g., string[0] in Python for the first character in a string. Julia uses 1 for the first element ...

I don't want to dwell on how all of this works, including inner functions and Python's scoping rules. I do, however, want to ask the question "how can you use Mypy to check all of this?" You could ...