Upgrade to Python 3

[SmiVan]

As everyone knows, Python 2.7 is getting deprecated in a couple months.

As of right now, it's not possible to automatically build the library from source without Python 2.7.

The following files contain references to Python 2.7 and will need to be updated to support Python 3, according to my quick grep:

• autogen.sh
• make_lite.py
• programs/test-sndfile-metadata-set.py
• Scripts/cstyle.py
• src/binheader_writef_check.py
• src/create_symbols_file.py

[erikd]

All of those are already Python3 compatible even if they do not specifically invoke python3.

[SmiVan]

Oh, that's great!
Then I guess all that needs to be done is to reroute them to the python3 interpreter.

Is the plan to do that exactly when old python gets dropped then?

[erikd]

On Debian and Ubuntu systems (what I know best) /usr/bin/python can be configured to point to either python2 or python3.

[SmiVan]

This issue is effectively closed, as compilation should be fine in all correct modern environments.