diff options
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/struct.rst | 49 |
1 files changed, 22 insertions, 27 deletions
diff --git a/Doc/library/struct.rst b/Doc/library/struct.rst index aa9921e..42bfc14 100644 --- a/Doc/library/struct.rst +++ b/Doc/library/struct.rst @@ -164,58 +164,53 @@ platform-dependent. +--------+--------------------------+--------------------+----------------+------------+ | ``c`` | :c:type:`char` | bytes of length 1 | 1 | | +--------+--------------------------+--------------------+----------------+------------+ -| ``b`` | :c:type:`signed char` | integer | 1 | \(1),\(4) | +| ``b`` | :c:type:`signed char` | integer | 1 | \(1),\(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``B`` | :c:type:`unsigned char` | integer | 1 | \(4) | +| ``B`` | :c:type:`unsigned char` | integer | 1 | \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``?`` | :c:type:`_Bool` | bool | 1 | \(2) | +| ``?`` | :c:type:`_Bool` | bool | 1 | \(1) | +--------+--------------------------+--------------------+----------------+------------+ -| ``h`` | :c:type:`short` | integer | 2 | \(4) | +| ``h`` | :c:type:`short` | integer | 2 | \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``H`` | :c:type:`unsigned short` | integer | 2 | \(4) | +| ``H`` | :c:type:`unsigned short` | integer | 2 | \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``i`` | :c:type:`int` | integer | 4 | \(4) | +| ``i`` | :c:type:`int` | integer | 4 | \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``I`` | :c:type:`unsigned int` | integer | 4 | \(4) | +| ``I`` | :c:type:`unsigned int` | integer | 4 | \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``l`` | :c:type:`long` | integer | 4 | \(4) | +| ``l`` | :c:type:`long` | integer | 4 | \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``L`` | :c:type:`unsigned long` | integer | 4 | \(4) | +| ``L`` | :c:type:`unsigned long` | integer | 4 | \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``q`` | :c:type:`long long` | integer | 8 | \(3), \(4) | +| ``q`` | :c:type:`long long` | integer | 8 | \(2), \(3) | +--------+--------------------------+--------------------+----------------+------------+ -| ``Q`` | :c:type:`unsigned long | integer | 8 | \(3), \(4) | +| ``Q`` | :c:type:`unsigned long | integer | 8 | \(2), \(3) | | | long` | | | | +--------+--------------------------+--------------------+----------------+------------+ -| ``f`` | :c:type:`float` | float | 4 | \(5) | +| ``f`` | :c:type:`float` | float | 4 | \(4) | +--------+--------------------------+--------------------+----------------+------------+ -| ``d`` | :c:type:`double` | float | 8 | \(5) | +| ``d`` | :c:type:`double` | float | 8 | \(4) | +--------+--------------------------+--------------------+----------------+------------+ -| ``s`` | :c:type:`char[]` | bytes | | \(1) | +| ``s`` | :c:type:`char[]` | bytes | | | +--------+--------------------------+--------------------+----------------+------------+ -| ``p`` | :c:type:`char[]` | bytes | | \(1) | +| ``p`` | :c:type:`char[]` | bytes | | | +--------+--------------------------+--------------------+----------------+------------+ -| ``P`` | :c:type:`void \*` | integer | | \(6) | +| ``P`` | :c:type:`void \*` | integer | | \(5) | +--------+--------------------------+--------------------+----------------+------------+ Notes: (1) - The ``c``, ``s`` and ``p`` conversion codes operate on :class:`bytes` - objects, but packing with such codes also supports :class:`str` objects, - which are encoded using UTF-8. - -(2) The ``'?'`` conversion code corresponds to the :c:type:`_Bool` type defined by C99. If this type is not available, it is simulated using a :c:type:`char`. In standard mode, it is always represented by one byte. -(3) +(2) The ``'q'`` and ``'Q'`` conversion codes are available in native mode only if the platform C compiler supports C :c:type:`long long`, or, on Windows, :c:type:`__int64`. They are always available in standard modes. -(4) +(3) When attempting to pack a non-integer using any of the integer conversion codes, if the non-integer has a :meth:`__index__` method then that method is called to convert the argument to an integer before packing. @@ -223,12 +218,12 @@ Notes: .. versionchanged:: 3.2 Use of the :meth:`__index__` method for non-integers is new in 3.2. -(5) +(4) For the ``'f'`` and ``'d'`` conversion codes, the packed representation uses the IEEE 754 binary32 (for ``'f'``) or binary64 (for ``'d'``) format, regardless of the floating-point format used by the platform. -(6) +(5) The ``'P'`` format character is only available for the native byte ordering (selected as the default or with the ``'@'`` byte order character). The byte order character ``'='`` chooses to use little- or big-endian ordering based @@ -310,9 +305,9 @@ the result in a named tuple:: The ordering of format characters may have an impact on size since the padding needed to satisfy alignment requirements is different:: - >>> pack('ci', '*', 0x12131415) + >>> pack('ci', b'*', 0x12131415) b'*\x00\x00\x00\x12\x13\x14\x15' - >>> pack('ic', 0x12131415, '*') + >>> pack('ic', 0x12131415, b'*') b'\x12\x13\x14\x15*' >>> calcsize('ci') 8 |