shell > yum -y install epel-release

shell > yum -y install gcc gcc-c++ wget readline-devel zlib-devel openssl-devel sqlite-devel

shell > python -V

Python 2.6.

shell > cd /usr/local/src; wget -c https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz

shell > tar zxf Python-2.7..tgz

sehll > cd Python-2.7.

shell > ./configure && make && make install

shell > python2 -V

Python 2.7.

shell > cd /usr/local/src; wget -c https://www.python.org/ftp/python/3.5.4/Python-3.5.4.tgz

shell > tar zxf Python-3.5..tgz

shell > cd Python-3.5.

shell > ./configure && make && make install

shell > python3 -V

Python 3.5.

shell > pip3 install virtualenv

shell > virtualenv --no-site-packages -p python2 py2.x

shell > source py2.x/bin/activate

(py2.x) shell > python -V

Python 2.7.

(py2.x) shell > pip install ipython

(py2.x) shell > ipython

Python 2.7. (default, Aug  , ::)

Type "copyright", "credits" or "license" for more information.

IPython 5.4. -- An enhanced Interactive Python.

? -> Introduction and overview of IPython's features.

%quickref -> Quick reference.

help -> Python's own help system.

object? -> Details about 'object', use 'object??' for extra details.

In []:

(py2.x) shell > deactivate

# 创建了一个 python2 的虚拟环境 名称为 py2.x，之后激活这个虚拟环境

# 可以看到默认的 python 版本已经不是原来的 2.6.6

# 使用 pip 安装 ipython 软件包

# ipython 调用的 python 版本也是 2.7.13

# 退出虚拟环境

shell > virtualenv --no-site-packages -p python3 py3.x

shell > source py3.x/bin/activate

(py3.x) shell > python -V

Python 3.5.

(py3.x) shell > pip install ipython

(py3.x) shell > ipython

Python 3.5. (default, Aug  , ::)

Type 'copyright', 'credits' or 'license' for more information

IPython 6.1. -- An enhanced Interactive Python. Type '?' for help.

In []:

(py3.x) shell > deactivate