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pybitop 2012-10-14 5 weekly downloads
README 2012-10-14 1.6 kB 11 weekly downloads
pybitop supplies bit-level operations on integers for Python. This module contains functions to perform bit level operations, e.g. bit extraction, reversal, counting; sign extension. Generally, inputs may be Python 'int' or 'long' types interchangably; return values are 'int' objects where possible and long' when the result does not fit in an int. functions: bit(ival,n) = bit at posn n; n >= 0 bitwidth(ival) = #bits required to hold ival (ival >= 0) this is ceil(log2(ival+1)) bitwidth_signed(ival) = # signed bits required to hold ival lowest_one(ival) = index of lowest '1' bit (-1 if ival is 0) bit_extract(ival,lo,hi) extract range of bits from ival bit_insert(ival1,lo,hi,ival2) field_mask( lo, hi) == sum(2**i for i in range(lo,hi)) sign_extend(ival,n) - discard bits n up; extend bit n-1 upwards. n>=1. bit_reverse(ival,n) - discard bits n up; bit-reverse the bits below n popcount(ival,n=None) - count all 1's in lower n bits (all bits if n missing; ival must be >=0 in this case). int_from_bytes( string [, byteorder]) convert bytes to a single integer; 'byteorder' is '<' for little-endian, '>' for big-endian, '' for native (default). int_to_bytes( k, nbytes [, byteorder]) convert a single integer to bytes; 'byteorder' is '<' for little-endian, '>' for big-endian, '' for native (default). Requires at least python 2.2; this release works up to Python 2.7, but does not support 3.x
Source: README, updated 2012-10-14