Import error when installing update 0.6.0b1

[antazoey]

• Version: 0.6.0b1
• Python: 3.9.7
• OS: macOS

What was wrong?

Crashes when trying to import the backend.

from eth_tester.backends import PyEVMBackend

Gets the issue:

ModuleNotFoundError: No module named 'eth.vm.forks.berlin'

My pyevm version is 0.3.0a20, which I see is not supported! However, I already had it installed in my environment from a separate package and there is nothing in this setup.py that gets mad about that.

I don't believe eth.vm.forks.berlin existed until 0.4.0, correct me if I am wrong!
Since py-evm is not listed in the install_requires, it does not ensure it gets updated or anything.

How can it be fixed?

Before importing BaseTransaction and TypedTransaction, check if pyevm version is high enough

[antazoey]

Ah, I guess this is solved on my end by including "eth-tester[pyevm]", in the setup.py.

At the same, checking the version in is_pyevm_available() is a little more clear I think