Centos7 install pyenv

Sometimes multiple python versions still hope to be isolated by pyenv to avoid interference between different versions of libraries. Sometimes in order to avoid the influence of inherent bugs, I hope to install a pure environment from scratch, and pyenv can work.

Install the dependent library files in advance##

sudo yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

Install pyenv

mkdir ~/.pyenv
git clone git://github.com/yyuu/pyenv.git ~/.pyenv  
echo 'export PYENV_ROOT="$HOME/.pyenv"'>>~/.bashrc  
echo 'export PATH="$PYENV_ROOT/bin:$PATH"'>>~/.bashrc  
echo 'eval "$(pyenv init -)"'>>~/.bashrc  
exec $SHELL -l

Test if it is installed##

pyenv install --list

An error may be reported, install the corresponding library files in advance and then install the environment

pip error while installing Python: “Ignoring ensurepip failure: pip 8.1.1 requires SSL/TLS”

The following library files need to be installed under ubuntu

apt-get install make build-essential libssl-dev zlib1g-dev libbz2-dev libsqlite3-dev

If it is Centos, install the following library files

yum install zlib-devel bzip2-devel sqlite sqlite-devel openssl-devel

Install python3.5.2 environment

pyenv install 3.5.2

Install the package for the corresponding environment##

. Install the Python version you need:

pyenv install 3.4.5 //The package that comes with the installation is pip and setuptools
Switch the system default Python version:
& pyenv global 3.4.5
Install the packages you need:
$ sudo ~/.pyenv/version/3.4.1/pip3 install requests
or it could be
$ pip install xxx //xxx is the package name

pip install requests

sudo ~/.pyenv/version/3.4.1/pip3 install requests

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