# Python3 venv Virtual Environment Fundamentals ## Create a venv To create a virtual environment, go to the root of your project and run ``python -m venv venv`` It will create a virtual environment called venv ## Activate venv `.\venv\bin\activate` Verify it is working with: `which python` and it should be `"something-something"/venv/bin/python` ## Intall packages Depending on what you're gonna do with the project. ``pip install jupyter matplotlib numpy pandas scipy scikit-learn`` ``pip install Flask`` ``pip install django`` or ``python -m pip install -U jupyter matplotlib numpy pandas scipy scikit-learn`` ## Create requirements.txt ``pip freeze > requirements.txt`` ## Deactivate venv ``deactivate`` ## Install packages from requirements.txt ``pip install -r requirements.txt`` Place the ``requirements.txt`` file in the root of your project directory. When ready to install the dependencies, ensure your terminal is navigated to the project directory and your virtual environment is activated. Then, run ``pip install -r requirements.txt`` to install the listed packages within your virtual environment. ```bash python -m venv venv .\venv\bin\activate pip install -r requirements.txt ``` __Also, more often lately (2023+), people have been suggesting your use `.venv` (note the dot).__ Besure your `.gitignore` file has both `venv/` and `.venv/` in it.