On Tue, Jun 16, 2009 at 2:25 PM, Tom Green <xchime...@gmail.com> wrote:
> Correct 8-bit ASCII. Sorry about that. I am using Python 2.5.2, which
> doesn't support bin. If I upgraded how would I go about converting the
> entire string to 8-bit ASCII?
>
> I appreciate your help.
you write the conversion yourself.
1. # convert a decimal (denary, base 10) integer to a binary string (base 2)
2. # tested with Python24 vegaseat 6/1/2005
3.
4. def Denary2Binary(n):
5. '''convert denary integer n to binary string bStr'''
6.
bStr = ''
7. if n < 0: raise ValueError, "must be a positive integer"
8. if n == 0: return '0'
9. while n > 0:
10. bStr = str(n % 2) + bStr
11. n = n >> 1
12. return bStr
13.
14. def int2bin(n, count=24):
15. """returns the binary of integer n, using count number of digits"""
16. return "".join([str((n >> y) & 1) for y in range(count-1, -1, -1)])
17.
18. # this test runs when used as a standalone program, but not as
an imported module
19. # let's say you save this module as den2bin.py and use it in
another program
20. # when you import den2bin the __name__ namespace would now be
den2bin and the
21. # test would be ignored
22. if __name__ == '__main__':
23. print Denary2Binary(255) # 11111111
24.
25. # convert back to test it
26. print int(Denary2Binary(255), 2) # 255
27.
28. print
29.
30. # this version formats the binary
31. print int2bin(255, 12) # 000011111111
32. # test it
33. print int("000011111111", 2) # 255
34.
35. print
36.
37. # check the exceptions
38. print Denary2Binary(0)
39. print Denary2Binary(-5) # should give a ValueError
from http://www.daniweb.com/code/snippet285.html#
HTH,
Wayne
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