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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 3.4.4 fixes the behavior of the module for the edge case of an empty BitVector instance. (An empty BitVector has no bits at all.) Previously, invoking the count_bits() and runs() methods on an empty BitVector instance produced results that were inconsistent with those from regular instances.

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__
  • close_file_object
  • count_bits
  • count_bits_sparse (faster for sparse bit vectors)
  • deep_copy
  • divide_into_two
  • gcd (for greatest common divisor)
  • gen_random_bits
  • get_bitvector_in_ascii
  • get_bitvector_in_hex
  • 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))
  • hamming_distance
  • int_val (for returning the integer value)
  • is_power_of_2
  • is_power_of_2_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
  • set_value
  • shift_left (for non-circular left shift)
  • shift_right (for non-circular right shift)
  • slice assignment
  • test_for_primality
  • unpermute
  • write_to_file
  • write_bits_to_fileobject

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