h Boost.Python can use to extract C++ objects
          from Python objects, and is typically used by facilities that define <code class="computeroutput"><span class="identifier">from_python</span></code> conversions for "traditional"
          Python extension types.
        </p>
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<a name="concepts.extractor.concept_requirements"></a><a class="link" href="extractor.html#concepts.extractor.concept_requirements" title="Concept Re