Modern tooling
uv, ruff, pyproject.toml, packaging, and current Python project workflows.
How to Enforce Indentation Rules From .editorconfig in Python
A mock function that reads .editorconfig-style indentation rules (spaces or tabs, size) and fixes indentation in source code lines by tracking brace depth.
def enforce_indent(editorconfig_rules, file_content):
"""
Mock function to enforce indentation rules from .editorconfig.
Returns the content with indentation fixed (or unchanged if already compliant).
"""
indent_style = editorconfig_rules.get("indent_style", "spaces")
indent_size = int(editorco…How to Mock a pipx Install Command in Python
Simulate a pipx install step by validating tool names and printing the exact command output a real pipx run would produce.
import subprocess
import sys
def install_with_pipx(tool_name: str) -> str:
"""
Mock a pipx install step by validating the tool name and
simulating the installation command output.
"""
allowed_tools = {"black", "flake8", "mypy", "ruff"}
if tool_name not in allowed_tools:
raise ValueErr…How to configure ruff linter rules in pyproject.toml with Python
This Python script generates a pyproject.toml file with ruff linter rules, including selected and ignored rules, per-file ignores, and complexity limits.
from pathlib import Path
def configure_ruff_rules(project_dir: str = "my_project") -> None:
"""Create a pyproject.toml with ruff linter rules for mock usage."""
pyproject_path = Path(project_dir) / "pyproject.toml"
pyproject_path.parent.mkdir(parents=True, exist_ok=True)
config = """[tool.ruff]
line-…How to set up mypy strict mode in Python
Demonstrates how to configure and run mypy in strict mode to enforce full type annotation coverage across a Python project.
from typing import Dict, Optional
def describe_user(name: str, age: int, email: Optional[str] = None) -> Dict[str, object]:
"""Build a user description dictionary with strict type annotations."""
user: Dict[str, object] = {"name": name, "age": age}
if email is not None:
user["email"] = email
…Makefile Targets for lint, test, and build in Python
This Python script defines common Makefile targets (lint, test, build) as subprocess commands, printing each target's command and executing them with error checking.
import subprocess
TARGETS = {
"lint": ["ruff", "check", "."],
"test": ["pytest", "-q"],
"build": ["python", "-m", "build"],
}
def run(target: str) -> None:
if target not in TARGETS:
raise ValueError(f"Unknown target: {target}")
print(f"Running {target}...")
subprocess.run(TARGETS[tar…Browse by section
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Modern tooling — Python code examples
What you will find here
This page collects modern tooling snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.
Samples vs tutorials and challenges
Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.