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---
title: "Python Virtual Environments"
date: 2019-05-21T23:04:54-04:00
draft: false
---
Dependency management is hard. Luckily with Python there is a program called `virtualenv` that can help isolate different projects and manage dependencies.
## Commands
To create a new python 3.7 environment type in the following:
```bash
virtualenv --python=python3.7 environment_name
```
Of course you can replace the python version with whichever version you like. Now to go into the environment do the following:
```bash
source environment_name/bin/activate
```
This now sets up your python interpretor and other utilities to use the installation in the `environment_name` folder. You can now install python packages using `pip` and have it only reside in this environment.
To save all currently installed packages into `requirements.txt`:
```bash
pip freeze > requirements.txt
```
You can then install those packages in a different virtualenv session with:
```bash
pip install -r requirements.txt
```
You can leave the virtualenv session with:
```bash
deactivate
```