Reading a binary file into a boolean array using Python's struct package

Question

I am trying to read a binary file (only 32 bits long) into a boolean array. It worked just fine when I followed:

However, when I try to use the struct package I get a different results:

_fmt = '32?'

with open(filename, mode='rb') as fp:
    content = struct.unpack(fmt, fp.read(struct.calcsize(fmt))

I would like to understand why.

Thanks

score 1 · Accepted Answer · answered Jan 31 '12 at 16:26

1

The format '32?' indicates 32 bytes, not 32 bits.

answered Jan 31 '12 at 16:26

unutbu

So I guess there is no way to read an array of booleans (1 bit) from a file directly using struct. – Hernan Jan 31 '12 at 16:33
1

Right; `struct` packs and unpacks bytes. – unutbu Jan 31 '12 at 16:41

score 0 · Answer 2 · answered Jan 31 '12 at 17:20

0

answered Jan 31 '12 at 17:20

Marcin

2 Answers2