Nobody seems to have noticed this AFAICS: 
If you type, e.g., help('+') to get help on operator precedence, the fist column gives a lit of operators for each row corresponding to a given precedence. However, the row for "not" (and similar for "await"), has the entry

"not" "x"

That looks as if there were two operators, "not" and "x". But the letter x is just an argument to the operator, so it should be:

 "not x"

exactly as for "+x" and "-x" and "~x" and "x[index]" and "x.attribute", where also x is not part of the operator but an argument.

On the corresponding web page https://docs.python.org/3/reference/expressions.html#operator-summary
it is displayed correctly, there are no quotes.