centos下安装python3(如果默认有python2)

yum install zlib openssl openssl-devel

如果用apt:

sudo apt-get install zlibc zlib1g-dev libssl-dev openssl

下载python编译安装

wget https://www.python.org/ftp/python/3.4.3/Python-3.4.3.tgztar zxvf Python-3.4.3.tgzcd Python-3.4.3./configure --with-pydebug && make && make installmv /usr/bin/python /usr/bin/python_oldln -s /usr/local/bin/pip3 /usr/local/bin/pipln -s /usr/local/bin/python3.4 /usr/bin/pythonvi /usr/bin/yum  #!/usr/bin/python -> #!/usr/bin/python_old

创建并进入虚拟环境(windows版没有pyvenv)

pyvenv tutorial-envcd tutorial-envsource bin/activate

安装其它库

pip install numpy

虚拟环境信息

pip show requestspip list

生成依赖关系

pip freeze > requirements.txt

安装当前环境所需依赖库

pip install -r requirements.txt