Add test for Parenthesized Context Mgr

[brocla]

@BethanyG This PR has two code snippets that exercise the parenthesis feature for context managers (new in 3.10).

I couldn't find an example directly from a student exercise, so I created this one that opens two files with a single context manager. The open statements are wrapped in parens, within the context manager.

The second snippet is copied from the python docs. Even though this doesn't look like a student exercise, I like it because it succinctly goes through many variations of the parens.

[BethanyG]

The second snippet is copied from the python docs. Even though this doesn't look like a student exercise, I like it because it succinctly goes through many variations of the parens.

Completely agree that having examples of the variations is really good. Buuut, I am a little resistant to using a long example with a bunch of pass statements. Let me think on it a bit, and see if I can cobble together something that has a bit more meat on it, but isn't too tedious with the variations.

I could grab one of the concept exercise test cases, but those are rather kludgy as well. Or maybe an example using Decimal.localcontext().

[brocla]

I just realized that I don't like my last commit. Please ignore it. I'll replace soonest.
Kevin

[brocla]

OK. Better.
I have removed the offending example and replaced it with a golden-like example. It uses the localcontext context manager twice, each with a different style of parens.

The example with the context manager that open two file simultaneously remains.

Kevin

[BethanyG]

Nice work, you! Thanks for putting this together.

I have a small qualm about the pandas code, since we don't have pandas installed on any of our tooling. However, the code parses just fine (it just wouldn't run if we tried evaluating it) -- so I think we can go ahead an merge this. 😄