Using pack in python

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Using pack in python
struct — Interpret bytes as packed binary data¶
Functions and Exceptions¶
Format Strings¶
Byte Order, Size, and Alignment¶

Using pack in python

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struct — Interpret bytes as packed binary data¶

This module converts between Python values and C structs represented as Python bytes objects. Compact format strings describe the intended conversions to/from Python values. The module’s functions and objects can be used for two largely distinct applications, data exchange with external sources (files or network connections), or data transfer between the Python application and the C layer.

When no prefix character is given, native mode is the default. It packs or unpacks data based on the platform and compiler on which the Python interpreter was built. The result of packing a given C struct includes pad bytes which maintain proper alignment for the C types involved; similarly, alignment is taken into account when unpacking. In contrast, when communicating data between external sources, the programmer is responsible for defining byte ordering and padding between elements. See Byte Order, Size, and Alignment for details.

Several struct functions (and methods of Struct ) take a buffer argument. This refers to objects that implement the Buffer Protocol and provide either a readable or read-writable buffer. The most common types used for that purpose are bytes and bytearray , but many other types that can be viewed as an array of bytes implement the buffer protocol, so that they can be read/filled without additional copying from a bytes object.

Functions and Exceptions¶

The module defines the following exception and functions:

Exception raised on various occasions; argument is a string describing what is wrong.

Return a bytes object containing the values v1, v2, … packed according to the format string format. The arguments must match the values required by the format exactly.

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Pack the values v1, v2, … according to the format string format and write the packed bytes into the writable buffer buffer starting at position offset. Note that offset is a required argument.

struct. unpack ( format , buffer ) ¶

Unpack from the buffer buffer (presumably packed by pack(format, . ) ) according to the format string format. The result is a tuple even if it contains exactly one item. The buffer’s size in bytes must match the size required by the format, as reflected by calcsize() .

struct. unpack_from ( format , / , buffer , offset = 0 ) ¶

Unpack from buffer starting at position offset, according to the format string format. The result is a tuple even if it contains exactly one item. The buffer’s size in bytes, starting at position offset, must be at least the size required by the format, as reflected by calcsize() .

struct. iter_unpack ( format , buffer ) ¶

Iteratively unpack from the buffer buffer according to the format string format. This function returns an iterator which will read equally sized chunks from the buffer until all its contents have been consumed. The buffer’s size in bytes must be a multiple of the size required by the format, as reflected by calcsize() .

Each iteration yields a tuple as specified by the format string.

Return the size of the struct (and hence of the bytes object produced by pack(format, . ) ) corresponding to the format string format.

Format Strings¶

Format strings describe the data layout when packing and unpacking data. They are built up from format characters , which specify the type of data being packed/unpacked. In addition, special characters control the byte order, size and alignment . Each format string consists of an optional prefix character which describes the overall properties of the data and one or more format characters which describe the actual data values and padding.

Byte Order, Size, and Alignment¶

By default, C types 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). This behavior is chosen so that the bytes of a packed struct correspond exactly to the memory layout of the corresponding C struct. Whether to use native byte ordering and padding or standard formats depends on the application.

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:

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