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Python Library Reference |  |
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This module performs conversions between Python values and C structs represented as Python strings. It uses format strings (explained below) as compact descriptions of the lay-out of the C structs and the intended conversion to/from Python values. This can be used in handling binary data stored in files or from network connections, among other sources.
The module defines the following exception and functions:
v1, v2,... packed according to the given
format. The arguments must match the values required by the format
exactly.
pack(fmt,
...)) according to the given format. The result is a
tuple even if it contains exactly one item. The string must contain
exactly the amount of data required by the format (i.e.
len(string) must equal calcsize(fmt)).
Format characters have the following meaning; the conversion between C and Python values should be obvious given their types:
| Format | C Type | Python | Notes |
|---|---|---|---|
| x | pad byte | no value | |
| c | char | string of length 1 | |
| b | signed char | integer | |
| B | unsigned char | integer | |
| h | short | integer | |
| H | unsigned short | integer | |
| i | int | integer | |
| I | unsigned int | long | (1) |
| l | long | integer | |
| L | unsigned long | long | |
| f | float | float | |
| d | double | float | |
| s | char[] | string | |
| p | char[] | string | |
| P | void * | integer |
Notes:
A format character may be preceded by an integral repeat count;
e.g. the format string '4h' means exactly the same as
'hhhh'.
Whitespace characters between formats are ignored; a count and its format must not contain whitespace though.
For the "s" format character, the count is interpreted as the
size of the string, not a repeat count like for the other format
characters; e.g. '10s' means a single 10-byte string, while
'10c' means 10 characters. For packing, the string is
truncated or padded with null bytes as appropriate to make it fit.
For unpacking, the resulting string always has exactly the specified
number of bytes. As a special case, '0s' means a single, empty
string (while '0c' means 0 characters).
The "p" format character can be used to encode a Pascal string. The first byte is the length of the stored string, with the bytes of the string following. If count is given, it is used as the total number of bytes used, including the length byte. If the string passed in to pack() is too long, the stored representation is truncated. If the string is too short, padding is used to ensure that exactly enough bytes are used to satisfy the count.
For the "I" and "L" format characters, the return value is a Python long integer.
For the "P" format character, the return value is a Python
integer or long integer, depending on the size needed to hold a
pointer when it has been cast to an integer type. A NULL pointer will
always be returned as the Python integer 0. When packing pointer-sized
values, Python integer or long integer objects may be used. For
example, the Alpha and Merced processors use 64-bit pointer values,
meaning a Python long integer will be used to hold the pointer; other
platforms use 32-bit pointers and will use a Python integer.
By default, C numbers are represented in the machine's native format and byte order, and properly aligned by skipping pad bytes if necessary (according to the rules used by the C compiler).
Alternatively, the first character of the format string can be used to indicate the byte order, size and alignment of the packed data, according to the following table:
| Character | Byte order | Size and alignment |
|---|---|---|
| @ | native | native |
| = | native | standard |
| < | little-endian | standard |
| > | big-endian | standard |
| ! | network (= big-endian) | standard |
If the first character is not one of these, "@" is assumed.
Native byte order is big-endian or little-endian, depending on the host system (e.g. Motorola and Sun are big-endian; Intel and DEC are little-endian).
Native size and alignment are determined using the C compiler's sizeof expression. This is always combined with native byte order.
Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and long are 4 bytes. float and double are 32-bit and 64-bit IEEE floating point numbers, respectively.
Note the difference between "@" and "=": both use native byte order, but the size and alignment of the latter is standardized.
The form "!" is available for those poor souls who claim they can't remember whether network byte order is big-endian or little-endian.
There is no way to indicate non-native byte order (i.e. force byte-swapping); use the appropriate choice of "<" or ">".
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 on the host system. The struct module does not interpret this as native ordering, so the "P" format is not available.
Examples (all using native byte order, size and alignment, on a big-endian machine):
>>> from struct import *
>>> pack('hhl', 1, 2, 3)
'\x00\x01\x00\x02\x00\x00\x00\x03'
>>> unpack('hhl', '\x00\x01\x00\x02\x00\x00\x00\x03')
(1, 2, 3)
>>> calcsize('hhl')
8
Hint: to align the end of a structure to the alignment requirement of
a particular type, end the format with the code for that type with a
repeat count of zero, e.g. the format 'llh0l' specifies two
pad bytes at the end, assuming longs are aligned on 4-byte boundaries.
This only works when native size and alignment are in effect;
standard size and alignment does not enforce any alignment.
See Also:
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Python Library Reference | |
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