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Project description

BitMap for python

This package provides a BitMap class which is an array of bits stored in compact format.


bitmap can be installed from pip:

$ sudo pip install bitmap


  • BitMap(maxnum): construct a BitMap object with maxnum bits
  • set(pos): set the bit at position pos to 1
  • reset(pos): reset the bit at position pos to 0
  • flip(pos): flip the bit at position pos
  • count(): return the number of 1s
  • size(): return the size of the BitMap
  • test(pos): check if bit at position pos has been set to 1
  • any(): check if any bit in the BitMap has been set to 1
  • none(): check if none of the bits in the BitMap has been set to 1
  • all(): check if all bits in the BitMap has been set to 1
  • nonzero(): return indexes of all non-zero bits
  • tostring(): convert a BitMap object to 0 and 1 string
  • fromstring(bitstring): create a BitMap object from 0 and 1 string


from bitmap import BitMap
bm = BitMap(32)
print bm.tostring()
print bm.tostring()

bm = BitMap.fromstring("00011101")
print bm.tostring()
print bm.tostring()

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