## mac
### 1.安装virtualenv和virtualenvwrapper
pip3 install -i https://mirrors.aliyun.com/pypi/simple virtualenv pip3 install -i https://mirrors.aliyun.com/pypi/simple virtualenvwrapper
注意：如果安装virtualenvwrapper 报错，一般执行：pip3 install --upgrade pip 即可
### 2.创建一个文件夹，用于存放虚拟环境 例如：python_env
### 3.环境变量添加：vi ~/.bash_profile
export WORKON_HOME="/Users/yanghaoyang/python_envs"
# which python 查看路径
export VIRTUALENVWRAPPER_PYTHON="/usr/local/bin/python3"
# which virtualenvwrapper.sh
source /Library/frameworks/Python.framework/Versions/3.7/bin/virtualenvwrapper.sh
### 4. source ~/.bash_profile 使之生效
### 5. 创建虚拟环境
mkvirtualenv env_test1
如果出现报错：ERROR: virtualenvwrapper could not find virtualenv in your path
解决方法：软链接 同样通过sudo find / -name 'virtualenv'可查找到路径
sudo ln -s /Library/frameworks/Python.framework/Versions/3.7/bin/virtualenv /usr/local/bin/virtualenv
### 退出
deactivate
## windons
1 下载：
pip install -i https://pypi.douban.com/simple virtualenvwrapper-win
2. 环境变量里面配置
3. 创建虚拟环境
mkvirtualenv -p /user/test/python.exe env_test1
