bitstring-2.2.0
June 18th 2011: version 2.2.0 released
This is a minor upgrade with a couple of new features.
New interleaved exponential-Golomb interpretations
New bit interpretations for interleaved exponential-Golomb (as used in the
Dirac video codec) are supplied via 'uie' and 'sie':
>>> s = BitArray(uie=41)
>>> s.uie
41
>>> s.bin
'0b00010001001'
These are pretty similar to the non-interleaved versions - see the manual
for more details. Credit goes to Paul Sargent for the patch.
New package-level bytealigned variable
A number of methods take a 'bytealigned' parameter to indicate that they
should only work on byte boundaries (e.g. find, replace, split). Previously
this parameter defaulted to 'False'. Instead it now defaults to
'bitstring.bytealigned', which itself defaults to 'False', but can be changed
to modify the default behaviour of the methods. For example:
>>> a = BitArray('0x00 ff 0f ff')
>>> a.find('0x0f')
(4,) # found first not on a byte boundary
>>> a.find('0x0f', bytealigned=True)
(16,) # forced looking only on byte boundaries
>>> bitstring.bytealigned = True # Change default behaviour
>>> a.find('0x0f')
(16,)
>>> a.find('0x0f', bytealigned=False)
(4,)
If you're only working with bytes then this can help avoid some errors and
save some typing!
Other changes
- Fix for Python 3.2, correcting for a change to the binascii module.
- Fix for bool initialisation from 0 or 1.
- Efficiency improvements, including interning strategy.