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ustruct – pack and unpack primitive data types

This module implements a subset of the corresponding CPython module, as described below. For more information, refer to the original CPython documentation: struct.

Supported size/byte order prefixes: @, <, >, !.

Supported format codes: b, B, h, H, i, I, l, L, q, Q, s, P, f, d (the latter 2 depending on the floating-point support).

Functions

calcsize

ustruct.calcsize(fmt)

Return the number of bytes needed to store the given fmt.

pack

ustruct.pack(fmt, v1, v2, ...)

Pack the values v1, v2, … according to the format string fmt. The return value is a bytes object encoding the values.

pack_into

ustruct.pack_into(fmt, buffer, offset, v1, v2, ...)

Pack the values v1, v2, … according to the format string fmt into a buffer starting at offset. offset may be negative to count from the end of buffer.

unpack

ustruct.unpack(fmt, data)

Unpack from the data according to the format string fmt. The return value is a tuple of the unpacked values.

unpack_from

ustruct.unpack_from(fmt, data, offset=0)

Unpack from the data starting at offset according to the format string fmt. offset may be negative to count from the end of buffer. The return value is a tuple of the unpacked values.