# Code Objects

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` type.

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, int firstlineno, PyObject *lnotab)
  Return value: New reference.

  Return a new code object. If you need a dummy code object to create a frame, use `PyCode_NewEmpty()` instead. Calling `PyCode_New()` directly can bind you to a precise Python version since the definition of the bytecode changes often.

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, int firstlineno, PyObject *lnotab)
  Return value: New reference.

  Similar to `PyCode_New()`, but with an extra “posonlyargcount” for positional-only arguments.

  New in version 3.8.

PyCodeObject *`PyCode_NewEmpty`(const char *filename, const char *funcname, int firstlineno)
  Return value: New reference.

  Return a new empty code object with the specified filename, function name, and first line number. It is illegal to `exec()` or `eval()` the resulting code object.

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.