Python Function Signatures (funcsigs)

funcsigs is a Python library that backports the function signature introspection features from Python 3.3's `inspect` module (PEP 362) to older Python versions. It allows developers to work with `Signature` and `Parameter` objects to understand callable arguments and return annotations, even in Python 2.6, 2.7, and 3.2+. Its latest version, 1.0.2, was released in April 2016, marking it as a mature and largely unmaintained project, as its core functionality has been integrated into Python's standard library for modern versions.