Remove unused six from setup.py

[jeffwidman]

This was removed from upstream code, but we forgot to update setup.py when we pulled that in.

[jeffwidman]

@bschoening IIRC you removed this from upstream right? So it's no longer an actual dep?

[jeffwidman]

As an aside, the whole setup.py file is no longer needed for GitHub's dep graph... they now parse newer python metadata files, but updating that is outside the scope of this PR.

[bschoening]

Yes, 'six' was removed in Apache Cassandra 4.1 (CASSANDRA-17417) and from the Python Driver in 3.29 datastax/python-driver#1172.

[jeffwidman]

@bschoening don't forget to approve the PR then 😁

[jeffwidman]

Also @bschoening does that mean this line should no longer reference six?

cqlsh/cqlsh/cqlsh.py

Line 116 in 59c30a4

third_parties = ('six-', 'pure_sasl-')

If so, then something to fix upstream not here, but just curious...

[bschoening]

Yes, that's the "ziploader" which is used with a tarball install of Cassandra where the driver and six are in the 'lib' directory. It shouldn't do anything when cqlsh is 'pip' installed. The use of 'six' there has been removed in Cassandra 5.0.

Six was used both by CQLSH in Apache Cassandra and in the DataStax Python driver. DataStax lagged quite a bit on removing the use and dependency on Six, and thus the zip loader still uses it in 4.1.x with the bundled driver version 3.25.

cqlsh 4.1 with Python driver version 3.29 - if you use the 'pip' installed cqlsh, you do not need six.
cqlsh 4.1 with Python driver version 3.28 or earlier - pip should have installed the 'six' requirement specified in https://github.com/datastax/python-driver/blob/3.28.0/requirements.txt.

It's been a two year+ journey to remove the last bits of Python 2.7 compatibility.