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# Copyright (c) 2008 - 2024, Ilan Schnell; All Rights Reserved
"""
This package defines an object type which can efficiently represent
a bitarray. Bitarrays are sequence types and behave very much like lists.
Please find a description of this package at:
https://github.com/ilanschnell/bitarray
Author: Ilan Schnell
"""
from __future__ import absolute_import
from bitarray._bitarray import (bitarray, decodetree, _sysinfo,
_bitarray_reconstructor,
get_default_endian, _set_default_endian,
__version__)
__all__ = ['bitarray', 'frozenbitarray', 'decodetree', 'bits2bytes']
class frozenbitarray(bitarray):
"""frozenbitarray(initializer=0, /, endian='big', buffer=None) -> \
frozenbitarray
Return a `frozenbitarray` object. Initialized the same way a `bitarray`
object is initialized. A `frozenbitarray` is immutable and hashable,
and may therefore be used as a dictionary key.
"""
def __init__(self, *args, **kwargs):
self._freeze()
def __repr__(self):
return 'frozen' + bitarray.__repr__(self)
def __hash__(self):
"Return hash(self)."
# ensure hash is independent of endianness
a = bitarray(self, 'big')
return hash((len(a), a.tobytes()))
# Technically the code below is not necessary, as all these methods will
# raise a TypeError on read-only memory. However, with a different error
# message.
def __delitem__(self, *args, **kwargs):
"" # no docstring
raise TypeError("frozenbitarray is immutable")
append = bytereverse = clear = extend = encode = fill = __delitem__
frombytes = fromfile = insert = invert = pack = pop = __delitem__
remove = reverse = setall = sort = __setitem__ = __delitem__
__iadd__ = __iand__ = __imul__ = __ior__ = __ixor__ = __delitem__
__ilshift__ = __irshift__ = __delitem__
def bits2bytes(__n):
"""bits2bytes(n, /) -> int
Return the number of bytes necessary to store n bits.
"""
import sys
if not isinstance(__n, (int, long) if sys.version_info[0] == 2 else int):
raise TypeError("integer expected")
if __n < 0:
raise ValueError("non-negative integer expected")
return (__n + 7) // 8
def test(verbosity=1):
"""test(verbosity=1) -> TextTestResult
Run self-test, and return unittest.runner.TextTestResult object.
"""
from bitarray import test_bitarray
return test_bitarray.run(verbosity=verbosity)
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