Add try block to import readline

[stuart-thomas-zoopla]

Add a try block to import readline to improve windows compatibility.

Testing
Executing a Hello World .spl file in windows 11.

Before fix

After fix

[zmbc]

Thanks so much! Would you be willing to run all the tests locally on Windows, to make sure there isn't anything else broken?

[stuart-thomas-zoopla]

All 30 failures are related to pexpect (full output attached testoutput.txt ). I've had a look and it seems to be another windows incompatibility and although there are a couple of windows ports of pexpect, neither seems to be up to date or working, and although pexpect has some windows compatibility, it doesnt support spawn. Can see more here https://pexpect.readthedocs.io/en/stable/overview.html#windows

I also had to downgrade the version of pyyaml being used to 5.3 in order to be able to get to a point where I could run the tests in windows due to an issue with compatibility with PEP517 builds. It looks like there are likely other packages (at least regex) that would also need investigating to see if there are compatibile versions, but doesnt seem worth it unless a fix for the pexpect issue can be found.

[zmbc]

Ah I see. pexpect is only used in the test suite -- if you don't mind, can you check whether you can run all the test programs directly (without error or obvious incorrect behavior)?