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Yeah but then don't say that SPy is a (interpreter and) compiler in the first place? Just say it's a interpreter.

It is a compiler. It is not a compiler for Python, because there are valid Python programs it can't compile and isn't intended to compile.

You can think of it like this:

SPy is a compiler. SPy is not a compiler for OCaml. SPy is not a compiler for COBOL. SPy is not a compiler for Python.