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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.

Change introduced in version 1.3.1: Removed the inconsistency in
the internal representation of bit vectors produced by logical bitwise
operations vis-a-vis the bit vectors created by the constructor.
Previously, the logical bitwise operations resulted in bit vectors that
had their bits packed into lists of ints, as opposed to arrays of
unsigned shorts.

Changes introduced in version 1.3: (1) One more constructor mode
included: When initializing a new bit vector with an integer value, you
can now also specify a size for the bit vector. The constructor
zero-pads the bit vector from the left with zeros. (2) The BitVector class
now supports 'if x in y' syntax to test if the bit pattern 'x' is contained
in the bit pattern 'y'. (3) Improved syntax to conform to well-established
Python idioms. (4) What used to be a comment before the beginning of each
method definition is now a docstring.

Changes introduced in version 1.2: (1) one more constructor mode: a bit
vector can now be constructed directly from a bitstring; (2) rich comparison
operators overloaded; (3) minimal length bit vectors constructed from int
values; (4) methods provided for extending a bit vector from the left and from
the right; (5) a unittest based testing framework incorporated in the package;
(6) additional debugging in code and in package setup.

Changes introduced in version 1.1.1: (1) peek feature incorporated in
block reads from disk files; (2) it is now possible to construct zero-sized bit

The class supports the following operators/methods:










__eq__, __ne__, __lt__, __le__, __gt__, __ge__

'|' for bitwise or

'&' for bitwise and

'^' for bitwise xor

'~' for bitwise inversion

'<<' for circular shift to the left

'>>' for circular shift to the right

'+' for concatenation

intValue(), __int__ for returning the integer value










Project details

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