Is legal assuming that the index range is not violated.Ħ) Given two bit vectors bv1 and bv2, you can perform bitwiseħ) Given two bit vectors bv1 and bv2, you can carry out theįollowing comparisons that return Boolean values: This is made possible by the override definition for theĥ) Negative subscripts for array-like indexing are supported. Is a bit vector constructed from the bits at index positionsĤ) You can iterate over a bit vector, as illustrated by
You can retrieve the bit at position M by bv. OPERATIONS SUPPORTED BY THE BITVECTOR CLASS:ġ) Since the BitVector class implements the _str_ method, aīit vector can be displayed on a terminal byīasically, you can always obtain the string representationĪCCESSING AND SETTING INDIVIDUAL BITS AND SLICES:Ģ) Any single bit of a bit vector bv can be set to 1 or 0 byįor accessing (and setting) the bit at the position that is (7) Yet another way to construct a bit vector is to read the bits Object that was acquired with a call to the BitVectorĬonstructor with a filename argument. To make the following sort of a call on the above variableīv1 will be a regular bit vector containing 64 bits from theĭisk file. If you want to re-read a file from the beginningįor some reason, you must obviously first close the file Now create bit vectors that actually hold the bits, you need This bit vector itself is incapable of holding the bits.
Procedure. First you construct an instance of bit vector by (5) You can construct a bit vector from a disk file by a two-step This bit vector will hold exactly 62 bits, all initialized to (4) You can create a zero-initialized bit vector of a given size Smaller than what it takes to create the shortest possibleīit vector for intVal, an exception is thrown. The zero padding needed for meeting the size Will return the bit vector consisting of the bit patternĠ0000000. (3) When initializing a bit vector with an intVal as shownĪbove, you can also specify a size for the bit vector: For example, when intVal is 0, the bit vectorĬonstructed will consist of just the bit 0. The shortest possible bit vector for the integer value The bits stored now will correspond to the binary (2) You can construct a bit vector from an integer by (1) You can construct a bit vector directly from either a tupleīv = BitVector( bitlist = )
You can construct a bit vector in seven different ways. IntValue() for returning the integer value TheĬore idea used in this Python script for bin packing is based onĪn internet posting by Josiah Carlson to the Pyrex mailing list. Of bit arrays and for logical operations on such arrays. The BitVector class for a memory-efficient packed representation To supply a keyword argument to the constructor. I have changed the API significantly to provide more ways forĬonstructing a bit vector. This simplifies reading loops. This version alsoĪllows BitVectors of size 0 to be constructed More_to_read attribute of the BitVector object is set toįalse. The function that does block reads from a disk file now peeksĪhead at the end of each block to see if there is anything Separate directory called "TestBitVector". '_int_'. (e) The package now includes a unittest basedįramework for testing out an installation. Includes a new method 'intValue()' that returns the unsigned
Just one bit of value 0, and so on. (c) All the richĬomparison operators are now overloaded. (d) The class now So the bit vector for the integer value 0 is (b) TheĬlass now constructs a shortest possible bit vector from an (a) One more constructor mode included: You can now constructĪ bit vector directly from a string of 1's and 0's. Used to be a comment before the beginning of each method Syntax to conform to well-established Python idioms. (d) What Pattern 'x' is contained in the bit pattern 'y'. (c) Improved The bit vector from the left with zeros. (b) The BitVectorĬlass now supports 'if x in y' syntax to test if the bit New bit vector with an integer value, you can now also (a) One more constructor mode included: When initializing a
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