pyenv を使って CentOS 5 に Python 3 をインストールする方法 ref: http://qiita.com/kentarosasaki/items/d7c492a38329f1b0f948

file0.txt

$ sudo yum -y install gcc make readline readline-devel zlib zlib-devel bzip2 bzip2-devel sqlite sqlite-devel openssl openssl-devel git

file1.txt

$ git clone git://github.com/yyuu/pyenv.git ~/.pyenv
$ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile
$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
$ echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init -)"\nfi' >> ~/.bash_profile
$ exec "$SHELL"

file2.txt

$ pyenv install --list
Available versions:
  2.1.3
  ...
  3.5.4
  ...

file3.txt

$ CFLAGS=-I/usr/include/openssl LDFLAGS=-L/usr/lib64 pyenv install -v 3.5.4

file4.txt

$ pyenv versions
* system
  3.5.4 (set by /home/user/.pyenv/version)

file5.txt

$ pyenv global 3.5.4

file6.txt

$ pyenv versions
  system
* 3.5.4 (set by /home/user/.pyenv/version)

file7.txt

$ python -V
Python 3.5.4