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Is there a Python class or module that implements a structure that is similar to the BitSet?
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A Python interface to the fast bitsets in Sage. Bitsets are fast binary sets that store elements by toggling bits in an array of numbers. A bitset can store values between 0 and capacity - 1 , inclusive (where capacity is finite, but arbitrary).
A bit array (also known as bit map, bit set, bit string, or bit vector) is an array data structure that compactly stores bits. It can be used to implement a simple set data structure.
Bitset represents a fixed-size sequence of N bits and stores values either 0 or 1. Zero means value is false or bit is unset and one means value is true or bit is set. Bitset class emulates space efficient array of boolean values, where each element occupies only one bit.
There's nothing in the standard library. Try:
http://pypi.python.org/pypi/bitarray
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