This document is for an old version of Python that is no longer supported. You should upgrade, and read the Python documentation for the current stable release.

# Byte Array Objects

`PyByteArrayObject`

  This subtype of `PyObject` represents a Python bytearray object.

PyTypeObject `PyByteArray_Type`

  This instance of `PyTypeObject` represents the Python bytearray type; it is the same object as `bytearray` in the Python layer.

## Type check macros

int `PyByteArray_Check`(PyObject *o)

  Return true if the object o is a bytearray object or an instance of a subtype of the bytearray type.

int `PyByteArray_CheckExact`(PyObject *o)

  Return true if the object o is a bytearray object, but not an instance of a subtype of the bytearray type.

## Direct API functions

PyObject* `PyByteArray_FromObject`(PyObject *o)
  Return value: New reference.

  Return a new bytearray object from any object, o, that implements the buffer protocol.

PyObject* `PyByteArray_FromStringAndSize`(const char *string, Py_ssize_t len)
  Return value: New reference.

  Create a new bytearray object from string and its length, len. On failure, `NULL` is returned.

PyObject* `PyByteArray_Concat`(PyObject *a, PyObject *b)
  Return value: New reference.

  Concat bytearrays a and b and return a new bytearray with the result.

Py_ssize_t `PyByteArray_Size`(PyObject *bytearray)

  Return the size of bytearray after checking for a `NULL` pointer.

char* `PyByteArray_AsString`(PyObject *bytearray)

  Return the contents of bytearray as a char array after checking for a `NULL` pointer. The returned array always has an extra null byte appended.

int `PyByteArray_Resize`(PyObject *bytearray, Py_ssize_t len)

  Resize the internal buffer of bytearray to len.

## Macros

These macros trade safety for speed and they don’t check pointers.

char* `PyByteArray_AS_STRING`(PyObject *bytearray)

  Macro version of `PyByteArray_AsString()`.

Py_ssize_t `PyByteArray_GET_SIZE`(PyObject *bytearray)

  Macro version of `PyByteArray_Size()`.