Tornado=6.0.1 creating error for python2.7 notebook

[DumbMachine]

I get the below error, when I try to run jupyter notebook. This has happened with multiple envs i have. This issue is related to tornado version 6.0.1 ( if I'm not wrong)

[DumbMachine]

If it helps, downgrading the version of tornado to 5.0 gets rid of the above issue.
(or any release other than 6.0, while being >=5.0)
pip install tornado=5.0

[yavalvas]

It looks that your problem is related to the version of Python which is no longer supported by Tornado:
what's new in 6-0-0
So you have type annotation in your tornado package which is used since python3.5:
https://www.python.org/dev/peps/pep-0484/.
It would be better to migrate to a supported version of Python or keep supported version fixed.

[DumbMachine]

It was a requirement to use python2.7, I made this issue to help others who might face this issue. Now that it's clear, I suppose the issue can be closed?

[yavalvas]

Yes, it can be closed.

Here is a list of packages which won't support python2.7 in their new versions:
https://python3statement.org/

tornado and jupyter-notebook are between them.

Python devguide changes:
EOL date