# Bytes Objects

These functions raise `TypeError` when expecting a bytes parameter and called with a non-bytes parameter.

type PyBytesObject

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

PyTypeObject PyBytes_Type
  Part of the Stable ABI.

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

int PyBytes_Check(PyObject *o)

  Return true if the object o is a bytes object or an instance of a subtype of the bytes type. This function always succeeds.

int PyBytes_CheckExact(PyObject *o)

  Return true if the object o is a bytes object, but not an instance of a subtype of the bytes type. This function always succeeds.

PyObject *PyBytes_FromString(const char *v)
  Return value: New reference. Part of the Stable ABI. Thread safety: Atomic.

  Return a new bytes object with a copy of the string v as value on success, and `NULL` on failure. The parameter v must not be `NULL`; it will not be checked.

PyObject *PyBytes_FromStringAndSize(const char *v, Py_ssize_t len)
  Return value: New reference. Part of the Stable ABI. Thread safety: Atomic.

  Return a new bytes object with a copy of the string v as value and length len on success, and `NULL` on failure. If v is `NULL`, the contents of the bytes object are uninitialized.

PyObject *PyBytes_FromFormat(const char *format, ...)
  Return value: New reference. Part of the Stable ABI. Thread safety: Atomic.

  Take a C `printf()`-style format string and a variable number of arguments, calculate the size of the resulting Python bytes object and return a bytes object with the values formatted into it. The variable arguments must be C types and must correspond exactly to the format characters in the format string. The following format characters are allowed:

  Format Characters | Type | Comment
  --- | --- | ---
  `%%` | n/a | The literal % character.
  `%c` | int | A single byte, represented as a C int.
  `%d` | int | Equivalent to `printf("%d")`. [1]
  `%u` | unsigned int | Equivalent to `printf("%u")`. [1]
  `%ld` | long | Equivalent to `printf("%ld")`. [1]
  `%lu` | unsigned long | Equivalent to `printf("%lu")`. [1]
  `%zd` | `Py_ssize_t` | Equivalent to `printf("%zd")`. [1]
  `%zu` | size_t | Equivalent to `printf("%zu")`. [1]
  `%i` | int | Equivalent to `printf("%i")`. [1]
  `%x` | int | Equivalent to `printf("%x")`. [1]
  `%s` | const char* | A null-terminated C character array.
  `%p` | const void* | The hex representation of a C pointer. Mostly equivalent to `printf("%p")` except that it is guaranteed to start with the literal `0x` regardless of what the platform’s `printf` yields.

  An unrecognized format character causes all the rest of the format string to be copied as-is to the result object, and any extra arguments discarded.

  [1] (1,2,3,4,5,6,7,8)

  For integer specifiers (d, u, ld, lu, zd, zu, i, x): the 0-conversion flag has effect even when a precision is given.

PyObject *PyBytes_FromFormatV(const char *format, va_list vargs)
  Return value: New reference. Part of the Stable ABI. Thread safety: Atomic.

  Identical to `PyBytes_FromFormat()` except that it takes exactly two arguments.

PyObject *PyBytes_FromObject(PyObject *o)
  Return value: New reference. Part of the Stable ABI. Thread safety: Safe for concurrent use on the same object.

  Return the bytes representation of object o that implements the buffer protocol.

  Note

  If the object implements the buffer protocol, then the buffer must not be mutated while the bytes object is being created.

Py_ssize_t PyBytes_Size(PyObject *o)
  Part of the Stable ABI. Thread safety: Atomic.

  Return the length of the bytes in bytes object o.

Py_ssize_t PyBytes_GET_SIZE(PyObject *o)
  Thread safety: Atomic.

  Similar to `PyBytes_Size()`, but without error checking.

char *PyBytes_AsString(PyObject *o)
  Part of the Stable ABI. Thread safety: Safe to call from multiple threads with external synchronization only.

  Return a pointer to the contents of o. The pointer refers to the internal buffer of o, which consists of `len(o) + 1` bytes. The last byte in the buffer is always null, regardless of whether there are any other null bytes. The data must not be modified in any way, unless the object was just created using `PyBytes_FromStringAndSize(NULL, size)`. It must not be deallocated. If o is not a bytes object at all, `PyBytes_AsString()` returns `NULL` and raises `TypeError`.

char *PyBytes_AS_STRING(PyObject *string)
  Thread safety: Safe to call from multiple threads with external synchronization only.

  Similar to `PyBytes_AsString()`, but without error checking.

int PyBytes_AsStringAndSize(PyObject *obj, char **buffer, Py_ssize_t *length)
  Part of the Stable ABI. Thread safety: Safe to call from multiple threads with external synchronization only.

  Return the null-terminated contents of the object obj through the output variables buffer and length. Returns `0` on success.

  If length is `NULL`, the bytes object may not contain embedded null bytes; if it does, the function returns `-1` and a `ValueError` is raised.

  The buffer refers to an internal buffer of obj, which includes an additional null byte at the end (not counted in length). The data must not be modified in any way, unless the object was just created using `PyBytes_FromStringAndSize(NULL, size)`. It must not be deallocated. If obj is not a bytes object at all, `PyBytes_AsStringAndSize()` returns `-1` and raises `TypeError`.

  Changed in version 3.5: Previously, `TypeError` was raised when embedded null bytes were encountered in the bytes object.

void PyBytes_Concat(PyObject **bytes, PyObject *newpart)
  Part of the Stable ABI. Thread safety: Safe for concurrent use on the same object.

  Create a new bytes object in *bytes containing the contents of newpart appended to bytes; the caller will own the new reference. The reference to the old value of bytes will be “stolen”. If the new object cannot be created, the old reference to bytes will still be “stolen”, the value of *bytes will be set to `NULL`, and the appropriate exception will be set.

  Note

  If newpart implements the buffer protocol, then the buffer must not be mutated while the new bytes object is being created.

void PyBytes_ConcatAndDel(PyObject **bytes, PyObject *newpart)
  Part of the Stable ABI. Thread safety: Safe for concurrent use on the same object.

  Create a new bytes object in *bytes containing the contents of newpart appended to bytes. This version releases the strong reference to newpart (i.e. decrements its reference count).

  Note

  If newpart implements the buffer protocol, then the buffer must not be mutated while the new bytes object is being created.

PyObject *PyBytes_Join(PyObject *sep, PyObject *iterable)
  Thread safety: Safe for concurrent use on the same object.

  Similar to `sep.join(iterable)` in Python.

  sep must be Python `bytes` object. (Note that `PyUnicode_Join()` accepts `NULL` separator and treats it as a space, whereas `PyBytes_Join()` doesn’t accept `NULL` separator.)

  iterable must be an iterable object yielding objects that implement the buffer protocol.

  On success, return a new `bytes` object. On error, set an exception and return `NULL`.

  Added in version 3.14.

  Note

  If iterable objects implement the buffer protocol, then the buffers must not be mutated while the new bytes object is being created.

int _PyBytes_Resize(PyObject **bytes, Py_ssize_t newsize)
  Thread safety: Safe to call without external synchronization on distinct objects.

  Resize a bytes object. newsize will be the new length of the bytes object. You can think of it as creating a new bytes object and destroying the old one, only more efficiently. Pass the address of an existing bytes object as an lvalue (it may be written into), and the new size desired. On success, *bytes holds the resized bytes object and `0` is returned; the address in *bytes may differ from its input value. If the reallocation fails, the original bytes object at *bytes is deallocated, *bytes is set to `NULL`, `MemoryError` is set, and `-1` is returned.

PyObject *PyBytes_Repr(PyObject *bytes, int smartquotes)
  Part of the Stable ABI. Thread safety: Atomic.

  Get the string representation of bytes. This function is currently used to implement `bytes.__repr__()` in Python.

  This function does not do type checking; it is undefined behavior to pass bytes as a non-bytes object or `NULL`.

  If smartquotes is true, the representation will use a double-quoted string instead of single-quoted string when single-quotes are present in bytes. For example, the byte string `'Python'` would be represented as `b"'Python'"` when smartquotes is true, or `b'\'Python\''` when it is false.

  On success, this function returns a strong reference to a `str` object containing the representation. On failure, this returns `NULL` with an exception set.

PyObject *PyBytes_DecodeEscape(const char *s, Py_ssize_t len, const char *errors, Py_ssize_t unicode, const char *recode_encoding)
  Part of the Stable ABI. Thread safety: Atomic.

  Unescape a backslash-escaped string s. s must not be `NULL`. len must be the size of s.

  errors must be one of `"strict"`, `"replace"`, or `"ignore"`. If errors is `NULL`, then `"strict"` is used by default.

  On success, this function returns a strong reference to a Python `bytes` object containing the unescaped string. On failure, this function returns `NULL` with an exception set.

  Changed in version 3.9: unicode and recode_encoding are now unused.