Could anyone explain what does this code do?
> `str.maketrans(...)` > If there are two arguments, they must be strings of equal length, and > in the resulting dictionary, each character in x will be mapped to the > character at the same position in y. If there is a third argument, it > must be a string, whose characters will be mapped to None in the result. so basically the first 2 are just dummy elements (mapping `' '` to `' '`, basically doing nothing), and everything in `exclude` will be mapped to None... so be excluded!