circuitpython/docs/library/ustruct.rst

45 lines
1.4 KiB
ReStructuredText
Raw Normal View History

:mod:`ustruct` -- pack and unpack primitive data types
======================================================
.. include:: ../templates/unsupported_in_circuitpython.inc
.. module:: ustruct
:synopsis: pack and unpack primitive data types
|see_cpython_module| :mod:`cpython: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
---------
.. function:: calcsize(fmt)
Return the number of bytes needed to store the given *fmt*.
.. function:: 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.
.. function:: 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*.
.. function:: unpack(fmt, data)
Unpack from the *data* according to the format string *fmt*.
The return value is a tuple of the unpacked values.
.. function:: 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.