A memory-efficient packed representation for bit arrays in pure Python
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With regard to the basic purpose of the module, it defines the BitVector class as a memory-efficient packed representation for bit arrays. The class comes with a large number of methods for using the representation in diverse applications such as computer security, computer vision, etc.
Version 3.4.8 fixes a bug in the slice assignment logic in the implementation of __setitem__().
Version 3.4.7 fixes a Python 3 specific bug in the write_to_file() method of the module. While I was at it, I have also changed the name of the method write_bits_to_fileobject() to write_bits_to_stream_object() so that there is no confusion between write_to_file() and write_bits_to_fileobject(). For backward compatibility, write_bits_to_fileobject() will continue to work if you are writing a bitvector to a string stream object.
The class is provided with the following operators/methods:
- __eq__, __ne__, __lt__, __le__, __gt__, __ge__
- count_bits_sparse (faster for sparse bit vectors)
- gcd (for greatest common divisor)
- gf_divide_by_modulus (for modular divisions in GF(2^n))
- gf_MI (for multiplicative inverse in GF(2^n))
- gf_multiply (for multiplications in GF(2))
- gf_multiply_modular (for multiplications in GF(2^n))
- int_val (for returning the integer value)
- is_power_of_2_sparse (faster for sparse bit vectors)
- shift_left (for non-circular left shift)
- shift_right (for non-circular right shift)
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