An Extractor is a class which Boost.Python can use to extract C++ objects from Python objects, and is typically used by facilities that define from_python conversions for "traditional" Python extension types.

In the table below, X denotes a model of Extractor and a denotes an instance of a Python object type.

Informally, an Extractor's execute member must be a non-overloaded static function whose single argument is a Python object type. Acceptable Python object types include those publicly (and unambiguously) derived from PyObject, and POD types which are layout-compatible with PyObject.