Python Classes and Dataclasses Cheat Sheet
Define Python classes, manage instance and class state, add properties and alternate constructors, use inheritance, and model records with dataclasses.
Open cheat sheet7 organized subcategories
Python
Practical language patterns, collections, functions, and tooling.
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Python subcategories
53 focused guides grouped by the kind of task you need to complete.
9 guides
Language and Objects
Define functions, classes, protocols, types, control flow, and reusable behavior.
Browse subcategory 9 guidesCollections and Iteration
Transform, combine, and traverse Python collections and iterables.
Browse subcategory 9 guidesData and Serialization
Represent text, numbers, structured data, dates, binary values, and persistent objects.
Browse subcategory 5 guidesPandas Data Analysis
Select, clean, combine, summarize, reshape, and analyze labeled tabular and time-series data.
Browse subcategory 6 guidesFiles, OS, and CLI
Build command-line tools and work with files, processes, configuration, and archives.
Browse subcategory 5 guidesPackages, Testing, and Quality
Organize, package, test, instrument, and distribute maintainable Python projects.
Browse subcategory 10 guidesConcurrency, Networking, and Performance
Coordinate parallel work, network services, databases, memory, and performance.
Browse subcategory9 cheat sheets
Language and Objects
Define functions, classes, protocols, types, control flow, and reusable behavior.
Python Context Managers Cheat Sheet
Manage files, locks, temporary state, cleanup stacks, and custom resources with with, contextmanager, closing, suppress, and ExitStack.
Open cheat sheetPython Decorators, Closures, and Callables Cheat Sheet
Build composable Python callables with closures, nonlocal state, metadata-preserving decorators, factories, partial, singledispatch, and callable objects.
Open cheat sheetPython Enums and Symbolic Constants Cheat Sheet
Model closed sets of Python constants with Enum, StrEnum, IntEnum, Flag, aliases, auto-generated values, validation decorators, and robust lookup behavior.
Open cheat sheetPython Exceptions Cheat Sheet
Raise, catch, inspect, chain, and clean up after Python exceptions with specific handlers, else, finally, custom errors, and context managers.
Open cheat sheetPython Functions Cheat Sheet
Define, call, document, annotate, and compose Python functions with safe defaults, flexible arguments, callbacks, closures, and decorators.
Open cheat sheetPython Object Protocols and Special Methods Cheat Sheet
Integrate Python classes with representation, truth testing, equality, hashing, ordering, container access, descriptors, and attribute lookup protocols.
Open cheat sheetPython Structural Pattern Matching Cheat Sheet
Route structured Python data with match and case using literals, captures, sequences, mappings, class patterns, OR patterns, AS patterns, guards, and enum constants.
Open cheat sheetPython Type Hints, Generics, and Protocols Cheat Sheet
Annotate Python functions, containers, unions, callables, generics, protocols, type guards, aliases, and dataclass-like records without confusing hints with runtime enforcement.
Open cheat sheet9 cheat sheets
Collections and Iteration
Transform, combine, and traverse Python collections and iterables.
Python Collections, Heaps, and Bisect Cheat Sheet
Choose efficient Python containers and ordering tools with Counter, defaultdict, deque, ChainMap, namedtuple, heapq, and bisect.
Open cheat sheetPython Comprehensions and Looping Patterns Cheat Sheet
Transform, filter, enumerate, pair, group, flatten, and iterate Python data clearly with comprehensions, generator expressions, zip, sorted, and itertools.
Open cheat sheetPython Dictionaries Cheat Sheet
Create, read, update, iterate, merge, and safely query Python dictionaries with practical examples.
Open cheat sheetPython Iterators and Generators Cheat Sheet
Process Python data lazily with iter, next, generator expressions, yield, yield from, enumerate, zip, itertools, and consumption-aware pipelines.
Open cheat sheetPython itertools, functools, and operator Cheat Sheet
Build efficient Python data pipelines with lazy iterators, grouping, combinatorics, reductions, partial application, caching, and operator-based accessors.
Open cheat sheetPython Lists Cheat Sheet
Create, access, update, slice, sort, and transform Python lists with practical copy-ready examples.
Open cheat sheetPython Sets and Frozensets Cheat Sheet
Create Python sets, test membership, remove duplicates, update values, perform set algebra, compare relationships, and use immutable frozensets.
Open cheat sheetPython Strings Cheat Sheet
Create, inspect, slice, normalize, search, replace, split, join, and format immutable Python strings with Unicode-aware examples.
Open cheat sheetPython Tuples, Ranges, and Sequence Operations Cheat Sheet
Work with immutable tuples, efficient ranges, indexing, slicing, unpacking, comparison, counting, and sequence protocols in Python.
Open cheat sheet9 cheat sheets
Data and Serialization
Represent text, numbers, structured data, dates, binary values, and persistent objects.
Python bytes, bytearray, memoryview, and Binary Data Cheat Sheet
Handle Python binary data safely with bytes, bytearray, memoryview, struct packing, hexadecimal conversion, slicing, and zero-copy buffer techniques.
Open cheat sheetPython Dates, Times, and Time Zones Cheat Sheet
Model dates, aware datetimes, UTC instants, parsing, IANA time zones, daylight-saving transitions, ambiguous times, and elapsed durations in Python.
Open cheat sheetPython Decimal, Fractions, and Numeric Precision Cheat Sheet
Handle Python numeric precision deliberately with float comparisons, math.fsum, Decimal contexts and rounding, Fraction arithmetic, and statistics.
Open cheat sheetPython JSON, CSV, and Data Interchange Cheat Sheet
Exchange JSON and CSV safely in Python with deterministic encoding, custom types, strict numeric parsing, duplicate detection, streams, dialects, and records.
Open cheat sheetPython pickle, shelve, and Persistent Objects Cheat Sheet
Persist trusted Python objects with pickle and shelve using explicit protocols, custom state, persistent IDs, safe inspection, and disciplined compatibility boundaries.
Open cheat sheetPython Random Sampling and Statistics Cheat Sheet
Generate reproducible simulations and summarize numeric data with random, secrets, and statistics while avoiding bias, invalid assumptions, and precision traps.
Open cheat sheetPython Regular Expressions Cheat Sheet
Search, validate, capture, iterate, split, replace, and debug text with Python's re module, raw strings, named groups, flags, and bounded patterns.
Open cheat sheetPython Text Encoding and Unicode Cheat Sheet
Handle Unicode text correctly in Python with UTF-8, normalization, case folding, grapheme-aware design, codec error policies, and explicit file boundaries.
Open cheat sheetPython XML Parsing and Generation Cheat Sheet
Parse, query, stream, modify, and generate XML safely with ElementTree, namespaces, incremental parsing, canonicalization, and security boundaries.
Open cheat sheet5 cheat sheets
Pandas Data Analysis
Select, clean, combine, summarize, reshape, and analyze labeled tabular and time-series data.
Pandas Data Cleaning and Missing Data Cheat Sheet
Detect missing values, normalize text, convert dtypes, validate values, and remove duplicate pandas records without hiding data quality problems.
Open cheat sheetPandas DataFrames and Indexing Cheat Sheet
Create, inspect, select, filter, update, sort, and index pandas DataFrames with explicit, Copy-on-Write-safe patterns.
Open cheat sheetPandas GroupBy, Aggregation, and Reshaping Cheat Sheet
Summarize groups, broadcast group statistics, filter groups, and reshape pandas data with pivot, melt, explode, and crosstab.
Open cheat sheetPandas Merging, Joining, and Concatenation Cheat Sheet
Combine pandas tables with validated joins, provenance indicators, concatenation, index alignment, nearest-key matching, and difference reports.
Open cheat sheetPandas Time Series, Resampling, and Rolling Cheat Sheet
Parse timestamps, handle time zones, build date indexes, resample observations, and calculate rolling, expanding, and exponentially weighted metrics.
Open cheat sheet6 cheat sheets
Files, OS, and CLI
Build command-line tools and work with files, processes, configuration, and archives.
Python argparse Command-Line Interfaces Cheat Sheet
Design testable Python command-line interfaces with argparse positionals, options, subcommands, validation, defaults, help text, and controlled errors.
Open cheat sheetPython Configuration with tomllib and configparser Cheat Sheet
Read TOML and INI configuration safely in Python with typed values, layered defaults, interpolation controls, validation, and version-aware standard-library APIs.
Open cheat sheetPython Files and Paths Cheat Sheet
Work safely with Python pathlib, text and binary files, directory traversal, globbing, JSON, temporary files, and atomic replacement.
Open cheat sheetPython OS Signals and Process Environment Cheat Sheet
Handle Python process signals, graceful shutdown, environment variables, child-process environments, platform differences, and startup configuration safely.
Open cheat sheetPython subprocess and Command Execution Cheat Sheet
Run child processes safely in Python with argument lists, captured text, checked exit codes, timeouts, standard input, environments, and Popen communication.
Open cheat sheetPython zipfile, tarfile, and Compression Cheat Sheet
Create, inspect, stream, and safely extract ZIP and tar archives with Python, plus gzip, bz2, lzma, and zlib compression for files and bytes.
Open cheat sheet5 cheat sheets
Packages, Testing, and Quality
Organize, package, test, instrument, and distribute maintainable Python projects.
Python importlib, Metadata, Resources, and Plugins Cheat Sheet
Use importlib for dynamic imports, installed distribution metadata, package resources, cache invalidation, and entry-point plugin discovery with safe boundaries.
Open cheat sheetPython Logging and Observability Cheat Sheet
Configure reliable Python logging with hierarchy, handlers, context, exception tracebacks, filters, structured events, and safe operational practices.
Open cheat sheetPython Modules and Packages Cheat Sheet
Organize Python code with modules, packages, imports, module execution, search paths, public APIs, relative imports, and importlib resources.
Open cheat sheetPython Packaging, Virtual Environments, and pyproject.toml Cheat Sheet
Structure, build, install, and publish Python projects with isolated environments, pyproject.toml metadata, reproducible dependencies, and safe release workflows.
Open cheat sheetPython unittest and Mocking Cheat Sheet
Structure deterministic Python tests with unittest cases, fixtures, subtests, exception assertions, mock patching, autospecs, call verification, and temporary resources.
Open cheat sheet10 cheat sheets
Concurrency, Networking, and Performance
Coordinate parallel work, network services, databases, memory, and performance.
Python asyncio and await Cheat Sheet
Write structured asynchronous Python with coroutines, tasks, task groups, timeouts, cancellation, queues, synchronization, and safe blocking-work delegation.
Open cheat sheetPython concurrent.futures and Parallel Work Cheat Sheet
Coordinate parallel Python work with thread, process, and interpreter executors, futures, ordered maps, completion handling, timeouts, and cancellation.
Open cheat sheetPython Hashing, HMAC, and Secrets Cheat Sheet
Use Python hashlib, hmac, and secrets correctly for digests, message authentication, secure tokens, password derivation, and constant-time verification.
Open cheat sheetPython Memory, Garbage Collection, and Weak References Cheat Sheet
Diagnose Python memory with reference ownership, cyclic garbage collection, weak references, finalizers, tracemalloc snapshots, and practical leak investigation.
Open cheat sheetPython multiprocessing and Shared Memory Cheat Sheet
Build reliable Python process workers with start methods, pools, queues, pipes, synchronization, managers, shared memory, and safe shutdown.
Open cheat sheetPython Profiling, Benchmarking, and Tracing Cheat Sheet
Measure Python performance responsibly with timeit, cProfile, pstats, tracemalloc, trace hooks, sampling principles, and repeatable experiments.
Open cheat sheetPython Sockets and Selectors Cheat Sheet
Build robust Python TCP and UDP clients and servers with address resolution, framing, timeouts, non-blocking sockets, selectors, and safe cleanup.
Open cheat sheetPython sqlite3 Databases Cheat Sheet
Build reliable embedded databases with Python sqlite3 connections, parameter binding, transactions, constraints, row factories, savepoints, and online backups.
Open cheat sheetPython Threading and Synchronization Cheat Sheet
Coordinate Python threads safely with locks, conditions, events, semaphores, barriers, queues, cancellation, and reliable shutdown patterns.
Open cheat sheetPython urllib HTTP Clients Cheat Sheet
Build standard-library HTTP clients with urllib: requests, query strings, form bodies, headers, timeouts, TLS, errors, proxies, redirects, and safe URL validation.
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