Python 3.6 support (nbconvert) about nbclient

[SylvainCorlay]

It seems that nbclient should be updated for nbconvert 6.0

@bainadeashish you should be able to work by pinning nbconvert 5.6.1

[SylvainCorlay]

@bainadeashish could you provide some more information about your environment (the output of pip list), and a specific code to reproduce the error?

[SylvainCorlay]

Ah, it seems the issue comes from the fact that nbclient requires python 3.7 (for AsyncGenerator support), and nbconvert 6.0 now relies on nbclient for nbexecute.

We will look for a workaround to maintain some support for Python 3.6 in a patch release, but we already announced that we would be dropping Python 3.6 support in the nbconvert 6.0.

[bainadeashish]

I tried for python 3.8 it works but for 3.6 it fails
Any other solution apart from upgrading our project from 3.6 to latest python release?

[SylvainCorlay]

Any other solution apart from upgrading our project from 3.6 to latest python release?

You can either

• upgrade python to 3.7 or 3.8

or

• pin nbconvert to 5.6.1 (any release before 6.0) until we publish a patch release with a workaround.

[SylvainCorlay]

Hum typing.AsyncGenerator is already defined in python 3.6.10 apparently.

[SylvainCorlay]

@bainadeashish correction: AsyncGenerator is new in Python 3.6.1, and absent in Python 3.6.0, which you are using.

[bainadeashish]

@SylvainCorlay thank you downgraded version of nbclien t to 5.6.1 and that solved issue.

[SylvainCorlay]

@bainadeashish great. Btw, upgrading python from 3.6.0 to 3.6.1 or any later version would have worked. We did not catch it in our CI because our 3.6 tests run on a more recent patch version.

[MSeal]

And I don't think we'll support 3.6.0 -- that version has many missing security patches and broken functionality

[SylvainCorlay]

Agreed. Closing. I will add a comment in nbconvert's readme that 3.6.1 is required.