Bytes Objects (original) (raw)
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.
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.
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.
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 toprintf("%d"). [1] |
| %u | unsigned int | Equivalent toprintf("%u"). [1] |
| %ld | long | Equivalent toprintf("%ld"). [1] |
| %lu | unsigned long | Equivalent toprintf("%lu"). [1] |
| %zd | Py_ssize_t | Equivalent toprintf("%zd"). [1] |
| %zu | size_t | Equivalent toprintf("%zu"). [1] |
| %i | int | Equivalent toprintf("%i"). [1] |
| %x | int | Equivalent toprintf("%x"). [1] |
| %s | const char* | A null-terminated C character array. |
| %p | const void* | The hex representation of a C pointer. Mostly equivalent toprintf("%p") except that it is guaranteed to start with the literal 0x regardless of what the platform’sprintf 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.
PyObject *PyBytes_FromFormatV(const char *format, va_list vargs)¶
Return value: New reference. Part of the Stable ABI.
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.
Return the bytes representation of object o that implements the buffer protocol.
Py_ssize_t PyBytes_Size(PyObject *o)¶
Part of the Stable ABI.
Return the length of the bytes in bytes object o.
Py_ssize_t PyBytes_GET_SIZE(PyObject *o)¶
Similar to PyBytes_Size(), but without error checking.
char *PyBytes_AsString(PyObject *o)¶
Part of the Stable ABI.
Return a pointer to the contents of o. The pointer refers to the internal buffer of o, which consists of len(o) + 1bytes. 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 usingPyBytes_FromStringAndSize(NULL, size). It must not be deallocated. If_o_ is not a bytes object at all, PyBytes_AsString() returns NULLand raises TypeError.
char *PyBytes_AS_STRING(PyObject *string)¶
Similar to PyBytes_AsString(), but without error checking.
int PyBytes_AsStringAndSize(PyObject *obj, char **buffer, Py_ssize_t *length)¶
Part of the Stable ABI.
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 usingPyBytes_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.
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 discarded and the value of *bytes will be set to NULL; the appropriate exception will be set.
void PyBytes_ConcatAndDel(PyObject **bytes, PyObject *newpart)¶
Part of the Stable ABI.
Create a new bytes object in *bytes containing the contents of _newpart_appended to bytes. This version releases the strong referenceto newpart (i.e. decrements its reference count).
int _PyBytes_Resize(PyObject **bytes, Py_ssize_t newsize)¶
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.