Boost Your Python Projects: 6 Must-Have Libraries Every Developer Needs
Discover six essential Python libraries—including PyPy, CFFI, PyInstaller, PBR, WxPython, and Mypy—that enhance performance, simplify packaging, enable C integration, improve type checking, and streamline desktop UI development, with download links and key features explained for developers of all levels.
Python's ease of use has made it popular in industry and academia, and its rich ecosystem of third‑party libraries expands its applicability.
PyPy
What is PyPy used for?
PyPy provides a fast Python runtime with a JIT compiler, delivering on average a 7.5× speed boost over standard CPython. Compatibility with many popular frameworks has improved in version 5.9.
Key features in PyPy 5.9
NumPy and Pandas now run on PyPy’s Python 2.7 compatible version; CFFI support and the Python C‑API compatibility layer have been enhanced, and the JSON parser is noticeably faster.
Where to download PyPy 5.9
Binary releases are available at https://pypy.org/download.html (Windows, macOS, Linux). Ensure you select the build matching your target Python version (2.7 or 3.5). Source code and issue tracker are hosted on Bitbucket: https://bitbucket.org/pypy/pypy
CFFI
What is CFFI used for?
CFFI (C Foreign Function Interface) enables Python programs to call external C libraries more easily than the built‑in ctypes module.
Features of CFFI 1.11
Version 1.11 adds beta support for upcoming Python 3.7, better Windows error handling, and support for modern C types such as float/double _complex, char16_t, and char32_t, with Unicode encoding as the default for C libraries.
Where to download CFFI 1.11
CFFI can be installed from PyPI: https://pypi.python.org/pypi/cffi or via pip: pip install cffi. Source code and issue tracking are on Bitbucket: https://bitbucket.org/cffi/cffi
PyInstaller
What is PyInstaller used for?
PyInstaller packages Python scripts into standalone executables, bundling required third‑party libraries.
Features of PyInstaller 3.3
Version 3.3 adds official support for Python 3.6, a more compatible bootloader for Windows, and expanded support for common libraries such as Qt, GTK+, NumPy, and Django. Future plans include cross‑platform packaging (e.g., building macOS binaries on Windows).
Where to download PyInstaller 3.3
Install from PyPI: https://pypi.python.org/pypi/PyInstaller/3.3 or via pip: pip install pyinstaller. Source code is on GitHub: https://github.com/pyinstaller/pyinstaller
PBR (Python Build Reasonableness)
What is PBR used for?
PBR standardizes the management of Setuptools‑based Python packages, automating version handling, changelog generation, and Sphinx documentation creation.
Features of PBR
Originally developed for OpenStack, PBR now operates independently and simplifies repetitive packaging tasks.
Where to download PBR
PBR is available on PyPI: https://pypi.python.org/pypi/pbr and can be installed with pip install pbr. Source code resides on GitHub: https://github.com/openstack-dev/pbr
WxPython
What is WxPython used for?
WxPython provides Python bindings for the wxWidgets C++ library, allowing developers to create native‑look cross‑platform desktop applications on Windows, macOS, Linux, and other Unix‑like systems.
Features of WxPython 4.0
The 4.0 “Phoenix” branch modernizes the API, improves performance, and requires code migration for existing projects (see migration guide). It is currently in beta and distributed via PyPI.
Where to download WxPython 4.0
Install from PyPI: https://pypi.python.org/pypi/wxPython/4.0.0b2 using pip install wxpython. Source code is on GitHub: https://github.com/wxWidgets/Phoenix
Mypy
What is Mypy used for?
Mypy adds optional static type checking to Python, improving code consistency and maintainability without runtime overhead.
Features of Mypy 0.530
Version 0.530 introduces protocol support, TypedDict types for dictionaries with specific value types, and stricter per‑file checking options.
Where to download Mypy 0.530
Mypy is available on PyPI: https://pypi.python.org/pypi/mypy and can be installed via pip install mypy. Source code is hosted on GitHub: https://github.com/python/mypy
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