Pip & Package Management

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pip is the standard package manager for Python. You use it to install, upgrade, and remove third-party libraries. In day-to-day work, pip is used together with venv so project dependencies stay isolated and reproducible.

What is a Package?

A package is a distributable set of Python modules and metadata, usually published on PyPI.

Check if `pip` is Installed

# Windows (py launcher)
py -m pip --version

python -m pip --version
# or
python3 -m pip --version

Using python -m pip is recommended because it targets the same Python interpreter you run. Run these commands inside your project virtual environment whenever possible.

Installing Packages

python -m pip install requests

Install a specific version when you need stable behavior:

python -m pip install requests==2.32.3

Upgrading Packages

python -m pip install --upgrade requests

You can also install optional extras:

python -m pip install "requests[socks]"

Using Installed Packages

This snippet requires the requests package to be installed first.

# non-runnable: requires external environment/setup
import requests

response = requests.get("https://belajarpython.com", timeout=10)
print(response.status_code)

Viewing Installed Packages

python -m pip list

Removing Packages

python -m pip uninstall requests

Searching and Inspecting Packages

Search at PyPI
Inspect package details:

python -m pip show requests

Reproducible Dependencies

python -m pip freeze > requirements.txt
python -m pip install -r requirements.txt

pip freeze captures exact installed versions, which helps avoid "works on my machine" issues.

Common Errors

Installing globally instead of in .venv, causing project mismatch later.
Running pip from a different Python installation than the one used to run the app.
Version conflicts between packages (resolve by pinning compatible versions).
Missing quotes for extras in some shells ("package[extra]").