bytes 对象

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

type PyBytesObject

此子类型的 PyObject represents a Python bytes object.

PyTypeObject PyBytes_Type
属于 稳定 ABI (应用程序二进制接口) .

此实例的 PyTypeObject represents the Python bytes type; it is the same object as bytes 在 Python 层。

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 )
返回值：新引用。 属于 稳定 ABI (应用程序二进制接口) .

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

PyObject * PyBytes_FromStringAndSize ( const char * v , Py_ssize_t len )
返回值：新引用。 属于 稳定 ABI (应用程序二进制接口) .

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 , ... )
返回值：新引用。 属于 稳定 ABI (应用程序二进制接口) .

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:

格式字符

类型

注释

%%

n/a

The literal % character.

%c

int

A single byte, represented as a C int.

%d

int

相当于 printf("%d") . [ 1 ]

%u

无符号 int

相当于 printf("%u") . [ 1 ]

%ld

long

相当于 printf("%ld") . [ 1 ]

%lu

unsigned long

相当于 printf("%lu") . [ 1 ]

%zd

Py_ssize_t

相当于 printf("%zd") . [ 1 ]

%zu

size_t

相当于 printf("%zu") . [ 1 ]

%i

int

相当于 printf("%i") . [ 1 ]

%x

int

相当于 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.

PyObject * PyBytes_FromFormatV ( const char * format , va_list vargs )
返回值：新引用。 属于 稳定 ABI (应用程序二进制接口) .

等同于 PyBytes_FromFormat() except that it takes exactly two arguments.

PyObject * PyBytes_FromObject ( PyObject * o )
返回值：新引用。 属于 稳定 ABI (应用程序二进制接口) .

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

Py_ssize_t PyBytes_Size ( PyObject * o )
属于 稳定 ABI (应用程序二进制接口) .

Return the length of the bytes in bytes object o .

Py_ssize_t PyBytes_GET_SIZE ( PyObject * o )

类似于 PyBytes_Size() , but without error checking.

char * PyBytes_AsString ( PyObject * o )
属于 稳定 ABI (应用程序二进制接口) .

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() 返回 NULL and raises TypeError .

char * PyBytes_AS_STRING ( PyObject * string )

类似于 PyBytes_AsString() , but without error checking.

int PyBytes_AsStringAndSize ( PyObject * obj , char * * buffer , Py_ssize_t * length )
属于 稳定 ABI (应用程序二进制接口) .

Return the null-terminated contents of the object obj through the output variables buffer and length 。返回 0 当成功时。

若 length is NULL , the bytes object may not contain embedded null bytes; if it does, the function returns -1 和 ValueError 被引发。

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() 返回 -1 and raises TypeError .

3.5 版改变： 先前， TypeError was raised when embedded null bytes were encountered in the bytes object.