Re: How to convert base 10 to base 2?

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From	Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject	Re: How to convert base 10 to base 2?
Date	Mon, 20 Aug 2012 13:29:56 -0400
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On Mon, 20 Aug 2012 16:52:42 +0200, Jean-Michel Pichavant
<jeanmichel@sequans.com> declaimed the following in
gmane.comp.python.general:

> note that the builtin bin function is not available with python ver < 2.6
> 
> def Denary2Binary(n):
>     '''convert denary integer n to binary string bStr'''
>     bStr = ''
>     if n < 0:  raise ValueError, "must be a positive integer"
>     if n == 0: return '0'
>     while n > 0:
>         bStr = str(n % 2) + bStr
>         n = n >> 1
>     return bStr
> 
> JM
> 
> (not my function but I can't remember who I stole from)

	I think I typically have done this by going through a hex
representation.

H2B_Lookup = {	"0" : "0000",	"1" : "0001",
					"2" : "0010",	"3" : "0011",
					"4" : "0100",	"5" : "0101",
					"6" : "0110",	"7" : "0111",
					"8" : "1000",	"9" : "1001",
					"A" : "1010",	"B" : "1011",
					"C" : "1100",	"D" : "1101",
					"D" : "1110",	"F" : "1111"	}

def I2B(i):
    sgn = " "
    if i < 0:
        sgn = "-"
        i = -i
    h = ("%X" % i)
    return sgn + "".join([H2B_Lookup[c] for c in h])

>>> from i2b import I2B
>>> I2B(10)
' 1010'
>>> I2B(1238)
' 010011100110'
>>> I2B(-6)
'-0110'
>>> 
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

Thread

How to convert base 10 to base 2? gianpycea@gmail.com - 2012-08-20 00:50 -0700
  Re: How to convert base 10 to base 2? Benjamin Kaplan <benjamin.kaplan@case.edu> - 2012-08-20 01:04 -0700
    Re: How to convert base 10 to base 2? Miki Tebeka <miki.tebeka@gmail.com> - 2012-08-21 09:23 -0700
    Re: How to convert base 10 to base 2? Miki Tebeka <miki.tebeka@gmail.com> - 2012-08-21 09:23 -0700
  Re: How to convert base 10 to base 2? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-20 09:10 +0100
  Re: How to convert base 10 to base 2? lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-20 09:26 +0100
  Re: How to convert base 10 to base 2? gianpycea@gmail.com - 2012-08-20 01:57 -0700
    Re: How to convert base 10 to base 2? Jean-Michel Pichavant <jeanmichel@sequans.com> - 2012-08-20 16:52 +0200
    Re: How to convert base 10 to base 2? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-20 13:29 -0400
    Re: How to convert base 10 to base 2? Joel Goldstick <joel.goldstick@gmail.com> - 2012-08-20 13:57 -0400
    Re: How to convert base 10 to base 2? Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-20 12:00 -0600
      Re: How to convert base 10 to base 2? Paul Rubin <no.email@nospam.invalid> - 2012-08-20 21:05 -0700
    Re: How to convert base 10 to base 2? Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-20 12:10 -0600

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