Please make sure you have the required [system dependencies](https://github.com/pyenv/pyenv/wiki#suggested-build-environment) installed before trying to install Python.
for more information about build options and the [common build problems](https://github.com/pyenv/pyenv/wiki/Common-build-problems) wiki page for any issues encountered during installation of python versions.
This feature is experimental but should be working well enough for most use cases. Incidentally, the first python version you install will claim `python`. With the above example:
In some cases, you might want python2 and python3 to co-exist, but python needs to point at a specific python version. The order of python versions is what controls this.