dib-python
Adds a symlink to /usr/local/bin/dib-python which points at either a python2 or python3 executable. This is useful for creating #! lines for scripts that are compatible with both python2 and python3.
This does not install a python if one does not exist, and instead fails.
This also exports a variable DIB_PYTHON_VERSION which will either be '2' or '3' depending on the python version which dib-python points to.