Remove dependency on six

[tammojan]

Casacore (and the rest of the world) has effectively dropped support for python 2, I think we can drop this support here as well.

[pep8speaks]

Hello @tammojan! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file casacore/tables/tableutil.py:

Line 486:80: E501 line too long (82 > 79 characters)
Line 487:80: E501 line too long (83 > 79 characters)
Line 497:80: E501 line too long (81 > 79 characters)
Line 555:31: E127 continuation line over-indented for visual indent
Line 557:35: E127 continuation line over-indented for visual indent
Line 561:12: E228 missing whitespace around modulo operator
Line 565:15: E203 whitespace before ':'

Comment last updated at 2024-09-02 09:59:20 UTC

[a-detiste]

The from __future__ import print_function I introduced in previous PR #261 can now go too.

[gmloose]

Dropping support for Python 2 would also mean removing all from __future__ import print_function lines. The new print function has been there since Python 3.0.