Manage project dependencies.

Create Virtual Environment

```bash # Create venv python -m venv myenv

Activate (Windows) myenv\Scripts\activate

Activate (Mac/Linux) source myenv/bin/activate ```

Install Packages

```bash # Install package pip install requests

Install specific version pip install django==4.2

Install from requirements.txt pip install -r requirements.txt ```

Save Dependencies

```bash # Create requirements.txt pip freeze > requirements.txt

Contents example: # requests==2.31.0 # django==4.2.0 ```

Deactivate

```bash deactivate ```

Why Use Virtual Environments?

- Isolate project dependencies - Avoid version conflicts - Easy to share project setup - Keep global Python clean

Remember

- One venv per project - Always activate before work - Add venv to .gitignore