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Python shortcuts: faster code and smarter tricks

Want to write Python code faster without making mistakes? These practical Python shortcuts save time, cut bugs, and make your scripts cleaner. I’ll show small changes that give big wins.

Quick syntax shortcuts

Use f-strings for clear string formatting: f"Name: {name}" is faster to read and less error-prone than format(). Unpack values in one line: a, b, *rest = items. The walrus operator (:=) reduces repetition when you need a value for both a test and use. Replace simple loops with list, set, or dict comprehensions to make intent obvious and often faster. For lazy processing use generator expressions inside sum(), any(), or join() to avoid building big lists.

Enumerate and zip are tiny helpers that keep code clean. Prefer enumerate(items, 1) when you need a 1-based index. Use zip(*pairs) to transpose rows and columns. Slicing with negative indices and steps can replace longer loops: data[::-1] reverses, data[start:stop:step] gives fine control. Use underscore _ in REPL as a quick last-result placeholder.

Tools and habits

Run code interactively with IPython or a Jupyter cell to test ideas fast. Enable autoreload in IPython to pick up changes while you iterate. Install and use pipx for single-tool installs so your main environment stays clean. Lint and format automatically with flake8 and Black—save time on style debates and focus on logic.

Use pathlib.Path instead of os.path for clearer file code. Prefer with open(path) as f to avoid manual closing. Add simple logging instead of print for debugging real apps; logging is easier to filter and keeps history. Use breakpoint() in Python 3.7+ for quick drops into a debugger without importing pdb.

Shortcuts for testing and debugging matter: write small pytest tests for new functions, and run only failing tests with -k to iterate quickly. Use pytest fixtures to reduce setup code. For dependency checks, pip freeze > requirements.txt or pip list --outdated help keep projects tidy.

Editor and workflow tips

Create snippets for common patterns like the main guard, context manager, or test template. Learn keyboard shortcuts in your editor—jump to definition, rename symbol, and multi-cursor edits save minutes. Use version control branches for experiments and stash changes when you need a clean slate.

Reach for standard helpers before writing custom code. collections.Counter and defaultdict remove a lot of boilerplate. functools.lru_cache speeds repeated calls with almost no work. dataclasses make small objects readable without tons of methods. Use typing hints to catch errors earlier and aid auto-complete. For timing, wrap functions with timeit or use time.perf_counter for quick checks. When concurrency helps, try concurrent.futures for simple parallelism before diving into asyncio. These small library choices cut code and improve reliability. Start small, try one per week, and measure the impact. everyday use.

Practice one shortcut a day and apply it to real code. Small, consistent changes beat big rewrites. Try swapping one loop for a comprehension or adding breakpoint() to a tricky function. After a week those tiny wins add up and your codebase will thank you.

Python Tricks: The Programmer's Secret Weapon
  • Programming Tips

Python Tricks: The Programmer's Secret Weapon

Feb, 7 2025
Lillian Hancock

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