The PyFunctionObject refers to a method created without the scope of a class. The structure representing the function is declared in the file Include/funcobject.h

typedef struct {
PyObject_HEAD
PyObject *func_code; /* A code object */
PyObject *func_globals; /* A dictionary (other mappings won’t do) */
PyObject *func_defaults; /* NULL or a tuple */
PyObject *func_closure; /* NULL or a tuple of cell objects */
PyObject *func_doc; /* The __doc__ attribute, can be anything */
PyObject *func_name; /* The __name__ attribute, a string object */
PyObject *func_dict; /* The __dict__ attribute, a dict or NULL */
PyObject *func_weakreflist; /* List of weak references */
PyObject *func_module; /* The __module__ attribute, can be anything */

/* Invariant:
* func_closure contains the bindings for func_code->co_freevars, so
* PyTuple_Size(func_closure) == PyCode_GetNumFree(func_code)
* (func_closure may be NULL if PyCode_GetNumFree(func_code) == 0).
*/
} PyFunctionObject;

The structure is self explanatory and I will not dwelve into further details. Also insert breakpoints in the file funcobject.c and observe the lifecycle of functions. Insert a comment below if you need help.

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