About this page: This is an llms.txt-style index of tutorials available on this site, intended for AI crawlers (ChatGPT, Perplexity, Claude) and search engines to discover the full content catalog.
# Python How To Program > Modern Python tutorials covering AI/LLM tooling, async web frameworks, data science, testing, performance, and the broader ecosystem. Written by Pubs, a Python developer with 15+ years of production experience. ## About Python How To Program publishes practical, code-first tutorials on the modern Python stack. Each article covers a specific library or technique with runnable examples, common pitfalls, and production guidance. Topics range from foundational Python (decorators, generators, async) to AI tooling (LangGraph, MCP, Pydantic AI), data processing (Polars, PyArrow), web frameworks (FastAPI, Litestar), CLI tools (Typer), and performance (Numba, joblib). ## Hub Page - [Modern Python AI Stack](https://pythonhowtoprogram.com/modern-python-ai-stack/): Curated tutorial hub covering LangGraph, MCP, Pydantic AI, Polars, FastAPI, Litestar, Typer, and 15+ more tools grouped by what you're building. ## Tutorials - [Modern Python AI Stack: The Complete 2026 Tutorial Hub](https://pythonhowtoprogram.com/modern-python-ai-stack/) - [How To Use Python Joblib for Parallel Computing and Caching](https://pythonhowtoprogram.com/how-to-use-python-joblib-for-parallel-computing-and-caching/) - [How To Use Python PyArrow for Columnar Data Processing](https://pythonhowtoprogram.com/how-to-use-python-pyarrow-for-columnar-data-processing/) - [How To Use Python Loguru for Simplified Logging](https://pythonhowtoprogram.com/how-to-use-python-loguru-for-simplified-logging/) - [How To Use Python Celery with Redis for Task Queues](https://pythonhowtoprogram.com/how-to-use-python-celery-with-redis-for-task-queues/) - [How To Build a Python CLI App with Typer](https://pythonhowtoprogram.com/how-to-build-a-python-cli-app-with-typer/) - [How To Use Python Pydantic AI for Structured AI Outputs](https://pythonhowtoprogram.com/how-to-use-python-pydantic-ai-for-structured-ai-outputs/) - [How To Use Python MCP Server for AI Tool Integration](https://pythonhowtoprogram.com/how-to-use-python-mcp-server-for-ai-tool-integration/) - [How To Use pyproject.toml for Modern Python Project Setup](https://pythonhowtoprogram.com/how-to-use-pyproject-toml-for-modern-python-project-setup/) - [How To Build an AI Agent with LangGraph in Python](https://pythonhowtoprogram.com/how-to-build-an-ai-agent-with-langgraph-in-python/) - [How To Use Polars for Fast DataFrame Operations in Python](https://pythonhowtoprogram.com/how-to-use-polars-for-fast-dataframe-operations-in-python/) - [How To Use Python Watchfiles for Real-Time File Monitoring](https://pythonhowtoprogram.com/how-to-use-python-watchfiles-for-real-time-file-monitoring/) - [How To Use Python Kivy for Cross-Platform Mobile and Desktop Apps](https://pythonhowtoprogram.com/how-to-use-python-kivy-for-cross-platform-mobile-and-desktop-apps/) - [How To Use Python Litestar for Async Web APIs](https://pythonhowtoprogram.com/how-to-use-python-litestar-for-async-web-apis/) - [How To Use Python litellm for Multi-Model LLM Integration](https://pythonhowtoprogram.com/how-to-use-python-litellm-for-multi-model-llm-integration/) - [How To Use Python instructor for Structured LLM Outputs](https://pythonhowtoprogram.com/how-to-use-python-instructor-for-structured-llm-outputs/) - [How To Use Python tox for Multi-Environment Test Automation](https://pythonhowtoprogram.com/how-to-use-python-tox-for-multi-environment-test-automation/) - [How To Use Python aiosmtplib for Async Email Sending](https://pythonhowtoprogram.com/how-to-use-python-aiosmtplib-for-async-email-sending/) - [How To Automate Remote Servers with Python Fabric](https://pythonhowtoprogram.com/how-to-automate-remote-servers-with-python-fabric/) - [How To Use Python tomllib for TOML File Parsing](https://pythonhowtoprogram.com/how-to-use-python-tomllib-for-toml-file-parsing/) - [How To Use Python chromadb as a Vector Database](https://pythonhowtoprogram.com/how-to-use-python-chromadb-as-a-vector-database/) - [How To Use Python LlamaIndex for Document Q&A](https://pythonhowtoprogram.com/how-to-use-python-llamaindex-for-document-qa/) - [How To Use Python coverage.py for Measuring Test Coverage](https://pythonhowtoprogram.com/how-to-use-python-coveragepy-for-measuring-test-coverage/) - [How To Use PyJWT for JSON Web Tokens in Python](https://pythonhowtoprogram.com/how-to-use-pyjwt-for-json-web-tokens-in-python/) - [How To Use Python cryptography for Encryption and Decryption](https://pythonhowtoprogram.com/how-to-use-python-cryptography-for-encryption-and-decryption/) - [How To Build a Python gRPC Service with grpcio](https://pythonhowtoprogram.com/how-to-build-python-grpc-service-grpcio/) - [How To Use Python numba for JIT-Compiled Performance](https://pythonhowtoprogram.com/how-to-use-python-numba-for-jit-compiled-performance/) - [How To Use Python PyGame for 2D Game Development](https://pythonhowtoprogram.com/how-to-use-python-pygame-for-2d-game-development/) - [How To Use Python pre-commit for Automated Code Quality Hooks](https://pythonhowtoprogram.com/how-to-use-python-pre-commit-for-automated-code-quality-hooks/) - [How To Use Python Plotly for Interactive Data Visualizations](https://pythonhowtoprogram.com/how-to-use-python-plotly-for-interactive-data-visualizations/) - [How To Use Alembic for Database Migrations in Python](https://pythonhowtoprogram.com/how-to-use-alembic-for-database-migrations-in-python/) - [How To Use Python poetry for Dependency and Project Management](https://pythonhowtoprogram.com/how-to-use-python-poetry-for-dependency-and-project-management/) - [How To Use Python Pillow for Image Processing](https://pythonhowtoprogram.com/how-to-use-python-pillow-for-image-processing/) - [How To Use Python kafka-python for Event Streaming](https://pythonhowtoprogram.com/how-to-use-python-kafka-python-for-event-streaming/) - [How To Use Python atexit for Graceful Shutdown](https://pythonhowtoprogram.com/how-to-use-python-atexit-for-graceful-shutdown/) - [How To Use Python signal for Unix Signal Handling](https://pythonhowtoprogram.com/how-to-use-python-signal-for-unix-signal-handling/) - [How To Use Python zlib and gzip for File Compression](https://pythonhowtoprogram.com/how-to-use-python-zlib-and-gzip-for-file-compression/) - [How To Use Python graphlib for Dependency Resolution](https://pythonhowtoprogram.com/how-to-use-python-graphlib-for-dependency-resolution/) - [How To Build a Dashboard with Python and Dash](https://pythonhowtoprogram.com/how-to-build-a-dashboard-with-python-and-dash/) - [How To Use Python aiosqlite for Async SQLite](https://pythonhowtoprogram.com/how-to-use-python-aiosqlite-for-async-sqlite/) - [How To Use Python motor for Async MongoDB Operations](https://pythonhowtoprogram.com/how-to-use-python-motor-for-async-mongodb-operations/) - [How To Use Python pika for RabbitMQ Message Queuing](https://pythonhowtoprogram.com/how-to-use-python-pika-for-rabbitmq-message-queuing/) - [How To Use Python timeit for Accurate Code Benchmarking](https://pythonhowtoprogram.com/how-to-use-python-timeit-for-accurate-code-benchmarking/) - [How To Use Python inspect to Examine Live Objects and Code](https://pythonhowtoprogram.com/how-to-use-python-inspect-to-examine-live-objects-and-code/) - [How To Use Python tkinter to Build Desktop GUI Apps](https://pythonhowtoprogram.com/how-to-use-python-tkinter-to-build-desktop-gui-apps/) - [How To Use Python imaplib to Read and Manage Emails](https://pythonhowtoprogram.com/how-to-use-python-imaplib-to-read-and-manage-emails/) - [How To Use Python Textual for Modern Terminal UIs](https://pythonhowtoprogram.com/how-to-use-python-textual-for-modern-terminal-uis/) - [How To Use Python stamina for Resilient Retry Logic](https://pythonhowtoprogram.com/how-to-use-python-stamina-for-resilient-retry-logic/) - [How To Use Python difflib for Comparing Text and Sequences](https://pythonhowtoprogram.com/how-to-use-python-difflib-for-comparing-text-and-sequences/) - [How To Use Python xmltodict for XML to Dictionary Conversion](https://pythonhowtoprogram.com/how-to-use-python-xmltodict-for-xml-to-dictionary-conversion/) - [How To Use Python unittest.mock for Mocking Dependencies](https://pythonhowtoprogram.com/how-to-use-python-unittest-mock-for-mocking-dependencies/) - [How To Use Python Gradio for Machine Learning Demos](https://pythonhowtoprogram.com/how-to-use-python-gradio-for-machine-learning-demos/) - [How To Use Python Streamlit for Interactive Data Apps](https://pythonhowtoprogram.com/how-to-use-python-streamlit-for-interactive-data-apps/) - [How To Use Python trio for Structured Concurrency](https://pythonhowtoprogram.com/how-to-use-python-trio-for-structured-concurrency/) - [How To Use Python textdistance for String Similarity](https://pythonhowtoprogram.com/how-to-use-python-textdistance-for-string-similarity/) - [How To Use Python cattrs for Structured Data Conversion](https://pythonhowtoprogram.com/how-to-use-python-cattrs-for-structured-data-conversion/) - [How To Use Python invoke for Task Automation](https://pythonhowtoprogram.com/how-to-use-python-invoke-for-task-automation/) - [How To Use Python sh for Shell Commands in Python](https://pythonhowtoprogram.com/how-to-use-python-sh-for-shell-commands-in-python/) - [How To Use Python orjson for Fast JSON Processing](https://pythonhowtoprogram.com/how-to-use-python-orjson-for-fast-json-processing-2/) - [How To Use Python glom for Nested Data Access](https://pythonhowtoprogram.com/how-to-use-python-glom-for-nested-data-access/) - [How To Use Python prettytable for ASCII Table Output](https://pythonhowtoprogram.com/how-to-use-python-prettytable-for-ascii-table-output/) - [How To Use Python dateparser for Natural Language Dates](https://pythonhowtoprogram.com/how-to-use-python-dateparser-for-natural-language-dates/) - [How To Use Python dynaconf for Configuration Management](https://pythonhowtoprogram.com/how-to-use-python-dynaconf-for-configuration-management/) - [How To Use Python snoop for Function Tracing and Debugging](https://pythonhowtoprogram.com/how-to-use-python-snoop-for-function-tracing-and-debugging/) - [How To Use Python alive-progress for Animated Progress Bars](https://pythonhowtoprogram.com/how-to-use-python-alive-progress-for-animated-progress-bars/) - [How To Use Python anyio for Async Compatibility](https://pythonhowtoprogram.com/how-to-use-python-anyio-for-async-compatibility/) - [How To Use Python boltons for Extended Python Utilities](https://pythonhowtoprogram.com/how-to-use-python-boltons-for-extended-python-utilities/) - [How To Use Python msgpack for Binary Message Serialization](https://pythonhowtoprogram.com/how-to-use-python-msgpack-for-binary-message-serialization/) - [How To Use Python aiofiles for Async File Operations](https://pythonhowtoprogram.com/how-to-use-python-aiofiles-for-async-file-operations/) - [How To Use Python diskcache for Disk-Based Caching](https://pythonhowtoprogram.com/how-to-use-python-diskcache-for-disk-based-caching/) - [How To Use Python python-dotenv for Environment Variables](https://pythonhowtoprogram.com/how-to-use-python-dotenv-for-environment-variables/) - [How To Use Python icecream for Better Debugging](https://pythonhowtoprogram.com/how-to-use-python-icecream-for-better-debugging/) - [How To Use Python xlrd for Reading Legacy Excel Files](https://pythonhowtoprogram.com/how-to-use-python-xlrd-for-reading-legacy-excel-files/) - [How To Use Python Pint for Physical Units and Quantities](https://pythonhowtoprogram.com/how-to-use-python-pint-for-physical-units-and-quantities/) - [How To Use Python Humanize for Human-Readable Output](https://pythonhowtoprogram.com/how-to-use-python-humanize-for-human-readable-output/) - [How To Use Python pyserial for Serial Port Communication](https://pythonhowtoprogram.com/how-to-use-python-pyserial-for-serial-port-communication/) - [How To Use Python toolz for Functional Programming](https://pythonhowtoprogram.com/how-to-use-python-toolz-for-functional-programming/) - [How To Use Python responses for Mocking HTTP Requests in Tests](https://pythonhowtoprogram.com/how-to-use-python-responses-for-mocking-http-requests-in-tests/) - [How To Use Python freezegun for Mocking Time in Tests](https://pythonhowtoprogram.com/how-to-use-python-freezegun-for-mocking-time-in-tests/) - [How To Use Python more-itertools for Advanced Iterators](https://pythonhowtoprogram.com/how-to-use-python-more-itertools-for-advanced-iterators/) - [How To Use Python Dask for Parallel and Distributed Computing](https://pythonhowtoprogram.com/how-to-use-python-dask-for-parallel-and-distributed-computing/) - [How To Use Python Faker for Generating Test Data](https://pythonhowtoprogram.com/how-to-use-python-faker-for-generating-test-data-2/) - [How To Use Python natsort for Natural Sort Order](https://pythonhowtoprogram.com/how-to-use-python-natsort-for-natural-sort-order/) - [How To Use Python pendulum for Better Date and Time Handling](https://pythonhowtoprogram.com/how-to-use-python-pendulum-for-better-date-and-time-handling/) - [How To Use Python structlog for Structured Logging](https://pythonhowtoprogram.com/how-to-use-python-structlog-for-structured-logging/) - [How To Use Python chardet for Character Encoding Detection](https://pythonhowtoprogram.com/how-to-use-python-chardet-for-character-encoding-detection/) - [How To Use Python boto3 for AWS S3 File Operations](https://pythonhowtoprogram.com/how-to-use-python-boto3-for-aws-s3-file-operations/) - [How To Use Python msgspec for Fast JSON Serialization](https://pythonhowtoprogram.com/how-to-use-python-msgspec-for-fast-json-serialization/) - [How To Use Python Watchdog for Filesystem Monitoring](https://pythonhowtoprogram.com/how-to-use-python-watchdog-for-filesystem-monitoring/) - [How To Use APScheduler for Task Scheduling in Python](https://pythonhowtoprogram.com/how-to-use-apscheduler-for-task-scheduling-in-python/) - [How To Use Python tabulate for Pretty-Printing Tables](https://pythonhowtoprogram.com/how-to-use-python-tabulate-for-pretty-printing-tables/) - [How To Use Python Pydash for Functional Programming Utilities](https://pythonhowtoprogram.com/how-to-use-python-pydash-for-functional-programming-utilities/) - [How To Use Python Paramiko for SSH Connections and SFTP](https://pythonhowtoprogram.com/how-to-use-python-paramiko-for-ssh-connections-and-sftp/) - [How To Implement Retry Logic in Python with Tenacity](https://pythonhowtoprogram.com/how-to-implement-retry-logic-in-python-with-tenacity/) - [How To Parse Dates and Times with Python dateutil](https://pythonhowtoprogram.com/how-to-parse-dates-and-times-with-python-dateutil/) - [How To Use Python attrs Library for Data Classes Without Boilerplate](https://pythonhowtoprogram.com/how-to-use-python-attrs-library-for-data-classes/) - [How To Use Python zipapp to Create Executable Python Archives](https://pythonhowtoprogram.com/how-to-use-python-zipapp-to-create-executable-python-archives/) - [How To Use Python string Module for Templates and Constants](https://pythonhowtoprogram.com/how-to-use-python-string-module-for-templates-and-constants/) - [How To Use Python cachetools for Flexible Caching Strategies](https://pythonhowtoprogram.com/how-to-use-python-cachetools-for-flexible-caching-strategies/) - [How To Use Python Loguru for Modern Application Logging](https://pythonhowtoprogram.com/how-to-use-python-loguru-for-modern-application-logging/) - [How To Create a Python Plugin System with importlib](https://pythonhowtoprogram.com/how-to-create-a-python-plugin-system-with-importlib/) - [How To Use Python importlib for Dynamic Module Loading](https://pythonhowtoprogram.com/how-to-use-python-importlib-for-dynamic-module-loading/) - [How To Use Python traceback Module for Error Reporting](https://pythonhowtoprogram.com/how-to-use-python-traceback-module-for-error-reporting/) - [How To Use Python bisect for Binary Search and Sorted Lists](https://pythonhowtoprogram.com/how-to-use-python-bisect-for-binary-search-and-sorted-lists/) - [How To Use Python tempfile for Temporary Files and Directories](https://pythonhowtoprogram.com/how-to-use-python-tempfile-for-temporary-files-and-directories/) - [How To Use Python operator Module for Functional Programming](https://pythonhowtoprogram.com/how-to-use-python-operator-module-for-functional-programming/) - [How To Use Python queue Module for Thread-Safe Communication](https://pythonhowtoprogram.com/how-to-use-python-queue-module-for-thread-safe-communication/) - [How To Use Python io Module for In-Memory File Buffers](https://pythonhowtoprogram.com/how-to-use-python-io-module-for-in-memory-file-buffers/) - [How To Use Python ast Module to Parse and Analyze Code](https://pythonhowtoprogram.com/how-to-use-python-ast-module-to-parse-and-analyze-code/) - [How To Use Python tqdm for Progress Bars in CLI and Loops](https://pythonhowtoprogram.com/how-to-use-python-tqdm-for-progress-bars-in-cli-and-loops/) - [How To Use Python Ruff for Fast Linting and Formatting](https://pythonhowtoprogram.com/how-to-use-python-ruff-for-fast-linting-and-formatting/) - [How To Build and Publish a Python Package to PyPI](https://pythonhowtoprogram.com/build-publish-python-package-pypi/) - [How To Use Python shutil for File Management and Archives](https://pythonhowtoprogram.com/python-shutil-file-management-archives/) - [How To Use Python lru_cache and functools.cache for Memoization](https://pythonhowtoprogram.com/python-lru-cache-functools-cache-memoization/) - [How To Use Python threading for Multi-Threaded Programs](https://pythonhowtoprogram.com/python-threading-multi-threaded-programs/) - [How To Use Python SQLModel for Database Models with FastAPI](https://pythonhowtoprogram.com/python-sqlmodel-database-models-fastapi/) - [How To Use Python dis Module to Inspect Bytecode](https://pythonhowtoprogram.com/python-dis-module-inspect-bytecode/) - [How To Use Python unicodedata for Unicode Operations](https://pythonhowtoprogram.com/python-unicodedata-unicode-operations/) - [How To Use Python textwrap Module for Text Formatting](https://pythonhowtoprogram.com/python-textwrap-module-text-formatting/) - [How To Parse and Validate URLs in Python](https://pythonhowtoprogram.com/python-parse-validate-urls-urllib-parse/) - [How To Use Python calendar Module for Date Calculations](https://pythonhowtoprogram.com/python-calendar-module-date-calculations/) - [How To Build REST APIs with Python and Starlette](https://pythonhowtoprogram.com/how-to-build-rest-apis-with-python-and-starlette/) - [How To Use Python weakref for Memory-Efficient References](https://pythonhowtoprogram.com/python-weakref-memory-efficient-references/) - [How To Use Python time Module for Benchmarking and Delays](https://pythonhowtoprogram.com/python-time-module-benchmarking-delays/) - [How To Use Python struct Module for Binary Data Packing](https://pythonhowtoprogram.com/python-struct-module-binary-data-packing/) - [How To Use Python __slots__ to Reduce Memory Usage](https://pythonhowtoprogram.com/python-slots-reduce-memory-usage/) - [How To Write Cross-Platform Python Code (Windows, Mac, Linux)](https://pythonhowtoprogram.com/cross-platform-python-code/) - [How To Use Python heapq for Priority Queues and Heaps](https://pythonhowtoprogram.com/how-to-use-python-heapq-for-priority-queues-and-heaps/) - [How To Use Python copy Module for Deep and Shallow Copies](https://pythonhowtoprogram.com/how-to-use-python-copy-module-for-deep-and-shallow-copies/) - [How To Work with Python bytes and bytearray](https://pythonhowtoprogram.com/how-to-work-with-python-bytes-and-bytearray/) - [How To Use Python socket Module for Network Programming](https://pythonhowtoprogram.com/how-to-use-python-socket-module-for-network-programming/) - [How To Parse XML with Python Using ElementTree](https://pythonhowtoprogram.com/how-to-parse-xml-with-python-using-elementtree/) - [How To Use Python hashlib for Cryptographic Hashing](https://pythonhowtoprogram.com/how-to-use-python-hashlib-for-cryptographic-hashing/) - [How To Create Custom Context Managers in Python](https://pythonhowtoprogram.com/how-to-create-custom-context-managers-python/) - [How To Use Python requests: Sessions, Retry, and Timeout](https://pythonhowtoprogram.com/how-to-use-python-requests-session-retry-timeout/) - [How To Use Python multiprocessing.Pool for Parallel Processing](https://pythonhowtoprogram.com/how-to-use-python-multiprocessing-pool/) - [How To Use Python concurrent.futures for Thread and Process Pools](https://pythonhowtoprogram.com/how-to-use-python-concurrent-futures/) - [How To Use Python Decorators: A Complete Guide](https://pythonhowtoprogram.com/how-to-use-python-decorators-complete-guide/) - [How To Use Python Generators and yield for Memory-Efficient Code](https://pythonhowtoprogram.com/how-to-use-python-generators-and-yield/) - [How To Build a Flask Web Application in Python](https://pythonhowtoprogram.com/how-to-build-a-flask-web-application-in-python/) - [How To Use Python os Module for File System Operations](https://pythonhowtoprogram.com/how-to-use-python-os-module/) - [How To Use Python datetime Module for Date and Time Operations](https://pythonhowtoprogram.com/how-to-use-python-datetime-module/) - [How To Use Python Regular Expressions with the re Module](https://pythonhowtoprogram.com/how-to-use-python-regular-expressions-with-the-re-module/) - [How To Read and Write CSV Files in Python](https://pythonhowtoprogram.com/how-to-read-and-write-csv-files-in-python/) - [How To Read and Write JSON Files in Python](https://pythonhowtoprogram.com/how-to-read-and-write-json-files-in-python/) - [How To Use the Python logging Module for Application Logging](https://pythonhowtoprogram.com/how-to-use-the-python-logging-module-for-application-logging/) - [How To Build CLI Apps with Python Click](https://pythonhowtoprogram.com/how-to-build-cli-apps-with-python-click/) - [How To Format Python Code with Black and isort](https://pythonhowtoprogram.com/how-to-format-python-code-with-black-and-isort/) - [How To Use Hypothesis for Property-Based Testing in Python](https://pythonhowtoprogram.com/how-to-use-hypothesis-for-property-based-testing-in-python/) - [How To Analyze Networks and Graphs with NetworkX in Python](https://pythonhowtoprogram.com/how-to-analyze-networks-and-graphs-with-networkx-in-python/) - [How To Use SymPy for Symbolic Mathematics in Python](https://pythonhowtoprogram.com/how-to-use-sympy-for-symbolic-mathematics-in-python/) - [How To Use SciPy for Scientific Computing in Python](https://pythonhowtoprogram.com/how-to-use-scipy-for-scientific-computing-in-python/) - [How To Create Data Visualizations with Seaborn in Python](https://pythonhowtoprogram.com/how-to-create-data-visualizations-with-seaborn-in-python/) - [How To Use Python Metaclasses for Advanced OOP](https://pythonhowtoprogram.com/how-to-use-python-metaclasses-for-advanced-oop/) - [How To Use Python Closures and Nested Functions](https://pythonhowtoprogram.com/how-to-use-python-closures-and-nested-functions/) - [How To Build GraphQL APIs with Python and Strawberry](https://pythonhowtoprogram.com/how-to-build-graphql-apis-with-python-and-strawberry/) - [How To Work with MongoDB in Python Using PyMongo](https://pythonhowtoprogram.com/how-to-work-with-mongodb-in-python-using-pymongo/) - [How To Connect Python to Redis for Caching and Queues](https://pythonhowtoprogram.com/how-to-connect-python-to-redis-for-caching-and-queues/) - [How To Use Celery for Background Tasks in Python](https://pythonhowtoprogram.com/how-to-use-celery-for-background-tasks-in-python/) - [How To Build Web Apps with Django in Python](https://pythonhowtoprogram.com/how-to-build-web-apps-with-django-in-python/) - [How To Use Python Property Decorators and Descriptors](https://pythonhowtoprogram.com/how-to-use-python-property-decorators-and-descriptors/) - 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