Day 29: pip and Virtual Environments

Quick Answer

What You Will Learn

• python -m venv .venv creates a separate environment called .venv inside the project.
• source .venv/bin/activate (Mac/Linux) or .venv\Scripts\activate (Windows) turns the environment on.
• pip install requests installs the package only inside this environment, not globally.
• pip freeze > requirements.txt saves the installed packages and versions to a file.
• pip install -r requirements.txt recreates the same setup on any new computer.
• deactivate turns the environment off.

Code

python -m venv .venv
source .venv/bin/activate
# Windows: .venv\Scripts\activate
pip install requests
pip freeze > requirements.txt
pip install -r requirements.txt
deactivate

Output

Day 29 is about terminal commands, so there is no Python output. Run the commands in your computer's terminal, in order.

Code Explained, Line by Line

1. python -m venv .venv creates a separate environment called .venv inside the project.
2. source .venv/bin/activate (Mac/Linux) or .venv\Scripts\activate (Windows) turns the environment on.
3. pip install requests installs the package only inside this environment, not globally.
4. pip freeze > requirements.txt saves the installed packages and versions to a file.
5. pip install -r requirements.txt recreates the same setup on any new computer.
6. deactivate turns the environment off.

Real-Life Use

Every professional Python project uses a venv plus requirements.txt so teammates get the same setup.

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