Unpack 3 and 6 byte two's complement integer in Python

Asked Jul 28 '21 at 19:54

Active Jul 28 '21 at 19:54

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How can I convert 3 and 6 byte big-endian two's complement Python bytes instances to Python ints?

I was hoping to use struct, but looking at https://docs.python.org/3/library/struct.html#format-characters, there are no 3 or 6 byte-long sizes.

Context: writing code to parse SQLite files, and it uses this representation in some cases https://www.sqlite.org/fileformat.html#record_format

asked Jul 28 '21 at 19:54

Michal Charemza

@mkrieger1 I didn't know about `int.from_bytes`! Feel free to make an answer... – Michal Charemza Jul 28 '21 at 19:56
2

And why not use the `sqlite3` module to use SQLite files? – mkrieger1 Jul 28 '21 at 19:57
@mkrieger1 Ah so I'm writing a streaming parser, to extract rows from a SQLite file while it's being downloaded – Michal Charemza Jul 28 '21 at 19:57

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