I know that variable names in Python's AST can be any string, so for instance you could declare and use a variable named "+a-b$ $$?", even though that's not val

I know that variable names in Python's AST can be any string, so for instance you could declare and use a variable named "+a-b$ $$?", even though that's not valid Python code. That's pretty minor, though, so I'm curious if there's anything more significant.