[Pyenv] Building a python environment with ubuntu 16.04

background

--Run tensorflow on ubuntu! ――But I'm using python2 code! !! ――Then, you have to put multiple versions in pyenv! !! !!

So, "to this article"

Install pyenv

sudo git clone git://github.com/yyuu/pyenv.git ./pyenv

[pyenv] PATH setting

export PYENV_ROOT=$HOME/.pyenv
export PATH=$PYENV_ROOT/bin:$PATH
eval "$(pyenv init -)"

python installation

banaoh@ubuntu-dlw:~$ pyenv install 3.6.1

Downloading Python-3.6.1.tar.xz...
-> https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tar.xz
Installing Python-3.6.1...

BUILD FAILED (Ubuntu 16.04 using python-build 1.1.1-1-g734e40d)

Inspect or clean up the working tree at /tmp/python-build.20170621142635.19271
Results logged to /tmp/python-build.20170621142635.19271.log

Last 10 log lines:
    ensurepip._main()
  File "/tmp/python-build.20170621142635.19271/Python-3.6.1/Lib/ensurepip/__init__.py", line 189, in _main
    default_pip=args.default_pip,
  File "/tmp/python-build.20170621142635.19271/Python-3.6.1/Lib/ensurepip/__init__.py", line 102, in bootstrap
    _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
  File "/tmp/python-build.20170621142635.19271/Python-3.6.1/Lib/ensurepip/__init__.py", line 27, in _run_pip
    import pip
zipimport.ZipImportError: can't decompress data; zlib not available
Makefile:1064: recipe for target 'install' failed
make: *** [install] Error 1

--Install because it says that zlib is missing

sudo apt-get install zlib1g-dev

--Install again

banaoh@ubuntu-dlw:~$ pyenv install 3.6.1

Downloading Python-3.6.1.tar.xz...
-> https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tar.xz
Installing Python-3.6.1...
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/pyenv/pyenv/wiki/Common-build-problems


BUILD FAILED (Ubuntu 16.04 using python-build 1.1.1-1-g734e40d)

Inspect or clean up the working tree at /tmp/python-build.20170621143006.3222
Results logged to /tmp/python-build.20170621143006.3222.log

Last 10 log lines:
                upgrade) ensurepip="--upgrade" ;; \
                install|*) ensurepip="" ;; \
        esac; \
         ./python -E -m ensurepip \
                $ensurepip --root=/ ; \
fi
Collecting setuptools
Collecting pip
Installing collected packages: setuptools, pip
Successfully installed pip-9.0.1 setuptools-28.8.0

--I get an error saying "Missing the OpenSSL lib", so install libssh

sudo apt-get install libssl-dev

--"Pyenv install 3.6.1" worked! !! !!

Check python version, switch version

banaoh@ubuntu-dlw:~$ python --version
Python 2.7.12

banaoh@ubuntu-dlw:~$ pyenv global 3.6.1
banaoh@ubuntu-dlw:~$ python --version
Python 3.6.1