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A pure-Python memory-efficient packed representation for bit arrays

Project description

This class presents a pure-Python memory-efficient packed representation for bit arrays.

Version 3.3 includes one more constructor mode: You can now construct a bit vector from the bytes data type. This version also includes a couple of bug fixes.

Version 3.2 includes support for constructing bit vectors directly from text strings and hex strings.

Version 3.1.1 removes the incompatibility of the module test code with how Python 2.7 expects its string input for creating memory files. This version of the module should work with all recent versions of Python 2.x and with Python 3.x.

The class is provided with the following operators/methods:

  • __getitem__
  • __setitem__
  • __len__
  • __iter__
  • __contains__
  • __getslice__
  • __str__
  • __int__
  • __add__
  • __eq__, __ne__, __lt__, __le__, __gt__, __ge__
  • __or__
  • __and__
  • __xor__
  • __invert__
  • __lshift__
  • __rshift__
  • __add__
  • count_bits
  • count_bits_sparse (faster for sparse bit vectors)
  • deep_copy
  • divide_into_two
  • gcd
  • gen_rand_bits_for_prime
  • getHexStringFromBitVector
  • getTextFromBitVector
  • gf_divide (for 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))
  • hamming_distance
  • intValue (for returning the integer value)
  • isPowerOf2
  • isPowerOf2_sparse (faster for sparse bit vectors)
  • jaccard_distance
  • jaccard_similarity
  • length
  • multiplicative_inverse
  • next_set_bit
  • pad_from_left
  • pad_from_right
  • permute
  • rank_of_bit_set_at_index
  • read_bits_from_file
  • reset
  • reverse
  • runs
  • shift_left for non-circular left shift
  • shift_right for non-circular right shift
  • slice assignment
  • setValue
  • test_for_primality
  • unpermute
  • write_to_file
  • write_bits_to_fileobject

Project details


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