It is — sort of — in both. It happens by programmers who are getting superstitious about what the actual type of a variable they have is, and `str()` it. Then t

It is — sort of — in both. It happens by programmers who are getting superstitious about what the actual type of a variable they have is, and `str()` it. Then they "know" what they're working with. (Alas, the string "None" or "null".)