Summary - Packaging

Combine pyproject.toml, venv and pip to write a packageable project.

Summary - Packaging

In this group you learned the core tools of Python packaging:

pyproject.toml: project identity and dependencies.
setuptools: the build tool via [build-system].
venv: an isolated virtual environment.
pip install -e .: editable install, sys.path.
requirements.txt: a frozen dependency list.

In the final task you will use all of them together: read pyproject content with tomllib and print the dependency count.

Exercise Print the project name and the dependency count

Start with import tomllib. Convert the TOML string below into structured data with data = tomllib.loads(...):

[project]
name = "demo"
version = "0.1.0"
dependencies = ["requests>=2.28", "httpx==0.24"]

Then print the project name with print(data["project"]["name"]) and the dependency count with print(len(data["project"]["dependencies"])).

Show example solution

import tomllib

data = tomllib.loads('''
[project]
name = "demo"
version = "0.1.0"
dependencies = ["requests>=2.28", "httpx==0.24"]
''')

print(data["project"]["name"])
print(len(data["project"]["dependencies"]))

Test yourself

Match the packaging tools

pyproject.toml

Project identity
setuptools

Build tool
venv

Virtual environment
requirements.txt

Dependency list
Which of the following is a valid table in pyproject.toml?
- [python]
- [project]
- [import]
- [package]
Show answer

[project] — The [project] table holds the package identity.

Next lesson: Project design

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