ModuleNotFoundError: No module named 'fcntl'

[arossert]

The latest version is not working on Windows as fcntl is not exists

[eht16]

It is expected and obvious that fnctl is not available on Windows.
I did not expect that anyone would use the library on Windows.

I will make the send buffer check optional.
Though I will not make a full alternative implementation for Windows. PRs welcome.

For my curiosity, do you use the library on Windows in a production environment or "just" in a development environment?

[arossert]

We are also using it in production

[eht16]

Should be fixed in master (aea33fb). It would be great if you could test it.

Release will follow soon.