Syntax error for naked trailing comma for 1-tuple

[AndersMunch]

@boxed

I was talking about situations where beginners get a 1-tuple, don’t know why, and “fix it” by adding [0] in one or more places.

There’s a nice example of that in test_functools.py. TestLRUPy.cached_func works exactly like this.

The author was not a beginner, far from it. The spurious trailing comma trips us all up from time to time.