Drop support for python 3.7:

[fselmo]

What was wrong?

We will have more peripheral updates to make due to the dropping of python 3.7, such as forgoing some typing imports from typing_extensions, etc. For now, we have PRs that are already expecting python 3.7 to be dropped and all tests fail there.

closes #3032

How was it fixed?

Drop the tests + CI support for py37 and the claim that the library supports 3.7.2 and above.

Todo:

• Add entry to the release notes

Cute Animal Picture

[reedsa]

A couple more references I noticed that may need to be removed.
Looks like there's a brief mention of 3.7 in the README.md.
I also see a docker config using python 3.7.

[fselmo]

A couple more references I noticed that may need to be removed. Looks like there's a brief mention of 3.7 in the README.md. I also see a docker config using python 3.7.

I'm not seeing these, can you link the references in the github code?

[kclowes]

LGTM! 🚀

[pacrob]

I see a few more conditionals that can go:

• ens/_normalization.py:29
• tests/core/eth-module/test_accounts.py:469, 481
• tests/core/middleware/test_stalecheck.py:143
• tests/core/providers/test_websocket_provider.py:24

[fselmo]

I see a few more conditionals that can go:

I was going to leave some of the deep-dive peripheral stuff related to dropping python 3.7 and just drop the support for it atm. But since you've highlighted these I can add them in here. There may be some others that we find along the way as well. I'll do a quick search for more as well.