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##### set up virtualenv(sandbox) for python
```bash
#1. install virtualenv
#1. install virtualenv.
sudo apt-get install virtualenv
#2. start a virtualenv
#2. Creat a directory (name it .venv or whatever name your want) for your new shiny isolated environment.
virtualenv .venv
#3. source virtual bin
source .venv/bin/activate
#4. you can check check if you are now inside a sandbox
#4. you can check check if you are now inside a sandbox.
type pip
#5. Now you can install your pip package, here requirements.txt is simply a txt file containing all the packages you want. (e.g tornado==4.5.3)
#5. Now you can install your pip package, here requirements.txt is simply a txt file containing all the packages you want. (e.g tornado==4.5.3).
pip install -r requirements.txt
```