Wayne, Thank you very much.
Robert On Wed, 2009-12-02 at 12:48 -0600, Wayne Werner wrote: > On Wed, Dec 2, 2009 at 12:08 PM, Robert Berman <berma...@cfl.rr.com> > wrote: > > Hi, > > I am trying to represent a number as a list of bits: for > example the bit representation of the integer 8. I did find a > number of articles pertaining to a module called bitarray but > I was unable to download/install that package. I am using > Linux on Ubuntu 9.10; Python 2.6.2. > > I am almost certain there is a relatively easy way to convert > an integer that can be represented by 32 bits into an array of > bits that I can iterate over looking for switched on bits or > switched off bits. > > Any information such as recipes or past articles in this list > providing methods to create and manipulate bit arrays would > be most appreciated. > > > > Python 2.6+ (as far as I know) has the bin() function: > > > Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit > (Intel)] on > win32 > Type "help", "copyright", "credits" or "license" for more information. > >>> bin(8) > '0b1000' > >>> > > > And larger: > > > >>> bin(99999999999999999999999) > '0b10101001011010000001011000111111000010100101011110110011111111111111111111111' > > > You can convert them to integers to use ^ (XOR) or & (AND) and other > binary operations on > them: > http://docs.python.org/reference/expressions.html#binary-bitwise-operations > > > >>> a = int('01001', 2) > >>> b = int('00001', 2) > >>> a & b == b > True > >>> a = int('01110', 2) > >>> a & b == b > False > > > There may be some other way to check, but that's probably the easiest > I know of. > > > HTH, > Wayne
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