python虚拟环境搭建

python环境搭建:

• 安装pyenv

git clone https://github.com/pyenv/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

• 安装python
  建议先下载 Python-3.6.5.tar.xz
  地址: https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tar.xz
  创建目录 .pyenv/cache
  mv Python-3.6.5.tar.xz .pyenv/cache
  安装命令:
  pyenv install -v 3.6.5

• centos部分库安装建议：

yum install readline readline-devel readline-static -y
yum install openssl openssl-devel openssl-static -y
yum install sqlite-devel -y
yum install bzip2-devel bzip2-libs -y
yum install libffi-devel -y

• debian系统

apt-get install build-essential -y
apt-get install libncurses5-dev libncursesw5-dev libreadline6-dev -y
apt-get install libdb5.3-dev libgdbm-dev libsqlite3-dev libssl-dev -y
apt-get install libbz2-dev libexpat1-dev liblzma-dev zlib1g-dev -y
apt-get install ca-certificates -y
apt-get install python-dev python-setuptools python-pip python-smbus
apt-get install libc6-dev tk-dev
apt-get install libffi-dev

ln /usr/lib/x86_64-linux-gnu/libssl.so.1.0.2 /usr/local/libssl.so
ln /usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.2 /usr/local/libcrypto.so

• 产看所有版本:
  pyenv versions
  查看当前版本:
  pyenv version
  切换版本:
  pyenv global 3.6.5 （建议python3.7 以上版本 用centos 7 以上系统）

• 配置豆瓣源
  HOME用户目录下
  mkdir .pip
  touch pip.conf

• 编辑pip.conf:

[global]
timeout = 60
index-url = https://pypi.doubanio.com/simple

• 创建虚拟环境
  python3 -m venv venv3.6

• 激活虚拟环境
  source venv3.6/bin/activate

• 安装依赖包
  pip3 freeze > requirements.txt 生成依赖包
  pip3 install -r requirements.txt