About Python Cheatsheet

Collections, comprehensions, dataclasses, useful stdlib modules. Part of the DevTools Surf developer suite. Browse more tools in the Cheatsheets collection.

Use Cases

• Looking up dictionary comprehension syntax for data transformation
• Referencing dataclass decorators when building data models
• Finding pathlib methods for cross-platform file operations
• Reviewing collections module classes for efficient data structures

Tips

• Check the comprehensions section for list, dict, and set patterns
• Review the dataclasses section for modern class definitions
• Use the stdlib section for commonly needed built-in modules

Fun Facts

• Python was created by Guido van Rossum and first released on February 20, 1991 — its name comes from Monty Python's Flying Circus, not the snake.
• Python's 'import this' Easter egg prints 'The Zen of Python' by Tim Peters, which includes 19 aphorisms (the 20th was intentionally left blank).
• Python overtook JavaScript as the most popular language on GitHub in 2024, driven largely by the explosive growth of AI and machine learning projects.

FAQ

Which Python version?

3.10+. Pattern matching, walrus operator, TypeAlias. Older Python 2 syntax is not covered.

What about dataclasses?

Yes — dataclasses and attrs both covered, including frozen, slots, and post_init.

Standard library highlights?

Collections (OrderedDict, Counter, defaultdict), itertools (chain, groupby, islice), functools (lru_cache, reduce), pathlib.

Comprehensions?

List, dict, set, and generator comprehensions. Plus the common gotcha of nested comprehensions and late-binding in closures.