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`ustruct` – Pack and unpack binary data¶

This module provides functions to convert between Python values and C-like data structs.

calcsize(format: str) → int¶

Gets the data size corresponding to a format string

pack(format, value1, value2, ...)¶

Packs the values using the given format.

pack_into(format, buffer, offset, value1, value2, ...)¶

Encode the values using the given format and write them to a given buffer.

Parameters

format (str) – Data format string.
buffer (bytearray) – Buffer to store the encoded data.
offset (int) – Offset from the start of the buffer. Use a negative value to count from the end of the buffer.

unpack(format, data) → Tuple¶

Decodes the binary data using the given format.

Parameters

Returns

The decoded data as a tuple of values.

unpack_from(format, data, offset) → Tuple¶

Decodes binary data from a buffer using the given format.

Parameters

format (str) – Data format string.
data (bytes or bytearray) – Data buffer to unpack.
offset (int) – Offset from the start of the data. Use a negative value to count from the end of the data.

Returns

The decoded data as a tuple of values.

The following byte orders are supported:

Character	Byte order	Size	Alignment
@	native	native	native
<	little-endian	standard	none
>	big-endian	standard	none
!	network (= big-endian)	standard	none

The following data types are supported:

Format	C Type	Python type	Standard size
b	signed char	integer	1
B	unsigned char	integer	1
h	short	integer	2
H	unsigned short	integer	2
i	int	integer	4
I	unsigned int	integer	4
l	long	integer (1)	4
L	unsigned long	integer (1)	4
q	long long	integer (1)	8
Q	unsigned long long	integer (1)	8
f	float	float	4
d	double	float	8
s	char[]	bytes
P	void *	integer

(1) Supports values up to +/-1073741823

ustruct – Pack and unpack binary data¶