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Build Go command-line apps with subcommands, flags, generated help, and shell completion.

Automate command-line work across Windows, Linux, and macOS with an object-based shell and scripting language.

Load project-specific environment variables when entering a directory, then unload them when leaving.

A reactive Python notebook editor that saves notebooks as ordinary Python files.

Run Python programs and isolate project packages with the official CPython interpreter.

Load, reshape, and analyze labeled tabular and time-series data with Python.

Manage Python project dependencies, virtual environments, and package metadata from `pyproject.toml`.

A Python and R IDE that pairs script and notebook editing with live data exploration tools.

A Python property-based testing library that generates inputs to challenge the properties your code should preserve.

Lint and format Python projects with one configurable command-line tool.

Install Python command-line applications into isolated environments or run them once without a permanent install.

Run Python tests with readable assertions, fixtures, parametrization, and failure reports.

Transform Python array functions with just-in-time compilation, automatic differentiation, and vectorization.

A Windows Python IDE pairing a script editor with an interpreter, debugger, project tools and unit-test interface.

Build Python HTTP APIs with typed parameters and automatically generated OpenAPI documentation.

Trace Python services and AI workflows with correlated OpenTelemetry data.

Render data-driven text and HTML from reusable templates with Python-inspired syntax.

A functional language and Mix toolchain for maintainable applications on the Erlang ecosystem.

Generate reference documentation from a Python project's modules and docstrings.

Manage plain-text task lists from the shell with a simple and extensible command-line tool.

Write scripts and JVM applications with Groovy's concise syntax and Java interoperability.

Search command-line cheatsheets and fill command arguments interactively.

A compact programmer's editor with both graphical and terminal interfaces and Lua-based customization.

Compile suitable Python numerical functions to machine code when they are first called.