Finding versions of Python that are available for “pyenv install”

pyenv accepts a switch to the install command to list available versions: --list, or -l for short:

$ pyenv install -l
Available versions:
  2.1.3
  2.2.3
  2.3.7
  2.4.0
  2.4.1
  2.4.2
...

Before running pyenv install -l, you may need to update pyenv as described here. Otherwise the list may not include the latest versions (thank you @csatt1).