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How can I declare a bit array of a very large size, say 6 million bits?
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To create a record array from binary data, use the numpy. core. records. fromstring() method in Python Numpy.
bitarray: efficient arrays of booleans. This library provides an object type which efficiently represents an array of booleans. Bitarrays are sequence types and behave very much like usual lists. Eight bits are represented by one byte in a contiguous block of memory.
In Python, you can create new datatypes, called arrays using the NumPy package. NumPy arrays are optimized for numerical analyses and contain only a single data type. You first import NumPy and then use the array() function to create an array. The array() function takes a list as an input.
from bitarray import bitarray a = bitarray(2**20) You can check out more info about this module at http://pypi.python.org/pypi/bitarray/
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The bitstring module may help:
from bitstring import BitArray a = BitArray(6000000) This will take less than a megabyte of memory, and it's easy to set, read, slice and interpret bits. Unlike the bitarray module it's pure Python, plus it works for Python 3.
See the documentation for more details.
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