程式碼物件
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Code objects are a low-level detail of the CPython implementation.
Each one represents a chunk of executable code that hasn't yet been
bound into a function.

type PyCodeObject

   The C structure of the objects used to describe code objects.  The
   fields of this type are subject to change at any time.

PyTypeObject PyCode_Type

   This is an instance of "PyTypeObject" representing the Python code
   object.

int PyCode_Check(PyObject *co)

   Return true if *co* is a code object. This function always
   succeeds.

int PyCode_GetNumFree(PyCodeObject *co)

   Return the number of free variables in *co*.

PyCodeObject *PyCode_New(int argcount, int kwonlyargcount, int nlocals, int stacksize, int flags, PyObject *code, PyObject *consts, PyObject *names, PyObject *varnames, PyObject *freevars, PyObject *cellvars, PyObject *filename, PyObject *name, PyObject *qualname, int firstlineno, PyObject *linetable, PyObject *exceptiontable)
    *回傳值：新的參照。*

   Return a new code object.  If you need a dummy code object to
   create a frame, use "PyCode_NewEmpty()" instead.  Calling
   "PyCode_New()" directly will bind you to a precise Python version
   since the definition of the bytecode changes often. The many
   arguments of this function are inter-dependent in complex ways,
   meaning that subtle changes to values are likely to result in
   incorrect execution or VM crashes. Use this function only with
   extreme care.

   在 3.11 版的變更: Added "qualname" and "exceptiontable" parameters.

PyCodeObject *PyCode_NewWithPosOnlyArgs(int argcount, int posonlyargcount, int kwonlyargcount, int nlocals, int stacksize, int flags, PyObject *code, PyObject *consts, PyObject *names, PyObject *varnames, PyObject *freevars, PyObject *cellvars, PyObject *filename, PyObject *name, PyObject *qualname, int firstlineno, PyObject *linetable, PyObject *exceptiontable)
    *回傳值：新的參照。*

   Similar to "PyCode_New()", but with an extra "posonlyargcount" for
   positional-only arguments. The same caveats that apply to
   "PyCode_New" also apply to this function.

   在 3.8 版新加入.

   在 3.11 版的變更: Added "qualname" and  "exceptiontable"
   parameters.

PyCodeObject *PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
    *回傳值：新的參照。*

   Return a new empty code object with the specified filename,
   function name, and first line number. The resulting code object
   will raise an "Exception" if executed.

int PyCode_Addr2Line(PyCodeObject *co, int byte_offset)

   Return the line number of the instruction that occurs on or before
   "byte_offset" and ends after it. If you just need the line number
   of a frame, use "PyFrame_GetLineNumber()" instead.

   For efficiently iterating over the line numbers in a code object,
   use the API described in PEP 626.

int PyCode_Addr2Location(PyObject *co, int byte_offset, int *start_line, int *start_column, int *end_line, int *end_column)

   Sets the passed "int" pointers to the source code line and column
   numbers for the instruction at "byte_offset". Sets the value to "0"
   when information is not available for any particular element.

   Returns "1" if the function succeeds and 0 otherwise.

   在 3.11 版新加入.

PyObject *PyCode_GetCode(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_code')". Returns a
   strong reference to a "PyBytesObject" representing the bytecode in
   a code object. On error, "NULL" is returned and an exception is
   raised.

   This "PyBytesObject" may be created on-demand by the interpreter
   and does not necessarily represent the bytecode actually executed
   by CPython. The primary use case for this function is debuggers and
   profilers.

   在 3.11 版新加入.

PyObject *PyCode_GetVarnames(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_varnames')". Returns
   a new reference to a "PyTupleObject" containing the names of the
   local variables. On error, "NULL" is returned and an exception is
   raised.

   在 3.11 版新加入.

PyObject *PyCode_GetCellvars(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_cellvars')". Returns
   a new reference to a "PyTupleObject" containing the names of the
   local variables that are referenced by nested functions. On error,
   "NULL" is returned and an exception is raised.

   在 3.11 版新加入.

PyObject *PyCode_GetFreevars(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_freevars')". Returns
   a new reference to a "PyTupleObject" containing the names of the
   free variables. On error, "NULL" is returned and an exception is
   raised.

   在 3.11 版新加入.
