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I concur with Martin. sys.getsizeof() should only count the memory that is not exposed as separate Python objects. In case of a code object this is the memory of the PyCodeObject structure and the memory of dynamic array co_cellvars (issue15456). Other subobjects are exposed as code object attributes and by gc.get_referents(). For counting the summary size you should recursively call sys.getsizeof() for objects returned by gc.get_referents(). But be aware that some subobjects (for example interned strings) can be shared between different code objects, so the average memory consumption is less than the simple sum.