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https://issues.apache.org/jira/browse/CASSANDRA-10190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16778833#comment-16778833
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Patrick Bannister commented on CASSANDRA-10190:
-----------------------------------------------

I think I'll need to look at this more closely to understand what happened, but 
sharing my initial intuition: I suspect this is a change in the internals of 
the Python re module. The saferscanner class plays with fire by extending the 
Python re.Scanner class. Scanner is supposed to be internal, not a public API 
offering, and dealing with changes in re.Scanner between Python 2.7 and Python 
3 was one of the first challenges I tackled in porting cqlsh to Python 3.

That's just my gut feeling looking at the stacktrace. I can look more in depth 
after I do more work with this branch when CASSANDRA-14298 is merged.

> Python 3 support for cqlsh
> --------------------------
>
>                 Key: CASSANDRA-10190
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10190
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Legacy/Tools
>            Reporter: Andrew Pennebaker
>            Priority: Major
>              Labels: cqlsh
>         Attachments: coverage_notes.txt
>
>
> Users who operate in a Python 3 environment may have trouble launching cqlsh. 
> Could we please update cqlsh's syntax to run in Python 3?
> As a workaround, users can setup pyenv, and cd to a directory with a 
> .python-version containing "2.7". But it would be nice if cqlsh supported 
> modern Python versions out of the box.



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