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