Install pyenv on Ubuntu 15.04

Basically, you can install pyenv by following guideline: “Ubuntu Workstation Copy-Paste install”

http://amaral-lab.org/resources/guides/pyenv-tutorial

After the installation, you can list all the installed python versions by the following command:

$ pyenv versions

If you want to install a Python version which is not equal to the version installed in your desktop, you should first check all the available versions.

$ pyenv install --list

Then, you can install a version chosen from the list.

$ pyenv install 3.4.3

But during the installation, you might face with several build problems like:

Installing Python-3.4.3...
WARNING: The Python bz2 extension was not compiled. Missing the bzip2 lib?
WARNING: The Python readline extension was not compiled. Missing the GNU readline lib?
ERROR: The Python ssl extension was not compiled. Missing the OpenSSL lib?

Please consult to the Wiki page to fix the problem.
https://github.com/yyuu/pyenv/wiki/Common-build-problems
BUILD FAILED (Ubuntu 15.04 using python-build 20150601-11-g36c5cbf)

Inspect or clean up the working tree at /tmp/python-build.20150709085352.14078
Results logged to /tmp/python-build.20150709085352.14078.log

Last 10 log lines:
(cd /home/bjlee/.pyenv/versions/3.4.3/share/man/man1; ln -s python3.4.1 python3.1)
if test "xupgrade" != "xno" ; then \
case upgrade in \
upgrade) ensurepip="--upgrade" ;; \
install|*) ensurepip="" ;; \
esac; \
./python -E -m ensurepip \
$ensurepip --root=/ ; \
fi
Ignoring ensurepip failure: pip 6.0.8 requires SSL/TLS

In that case, you should install missing packages.

$sudo apt-get install libssl-dev libsqlite3-dev libreadlines-dev libbz2-dev