Jacob - just for you, begin your agitation for the next release please ;)
binstring.py, as attached.
(also pasted up - http://www.rafb.net/paste/results/5feItM57.html)
Creating this, was just a brain teaser, but I was thinking 'what if I
wanted to make this for the standard library.'
And so you can see, I had to include a flag for endianess. But that
was really a cheap trick. If this was going into a standard library,
I'd want to query the OS for endianess. As for the bits, once again,
32 bit is the norm, but 64 bit is here and spreading.
Also, should it display 11111111 as 255 or 256? Both are valid,
depending on context.
Thirdly, if I can do it in 2 minutes, (well, the main part), then
should they bother putting it in the standard library considering
also,
- How often, really, are you going to need to present a decimal or hex
as a binary string.
Lastly - this only does base 10 to base 2. Should I include a base 6
to base 2, base 8 to base 2, base 10 to 6, 10 to 8, 8 to 6?
I wouldn't like to write for the standard library, because you can
never please everyone.
But yeah, feel free to use the above, just keep my doc strings and comments.
Regards,
Liam Clarke
On Fri, 4 Feb 2005 23:30:19 -0500, Jacob S. <[EMAIL PROTECTED]> wrote:
> > The binary value is the same as the hex value.
> > The binary representation is 000111110100, but
> > unfortunately Python doesn't support binary in
> > its string formatting(although it does in int()!
>
> Uh, question. Why not? It seems that all simple types should be included.
> Since the computer stores it as binary, why shouldn't python be able to
> display a
> string of it in binary? That seems to be a short coming that should be added
> to the
> next release... IMHO of course.
> Jacob Schmidt
>
> _______________________________________________
> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
--
'There is only one basic human right, and that is to do as you damn well please.
And with it comes the only basic human duty, to take the consequences.
######
# binString.py
# by Liam Clarke
#(Let me know when it's included in the standard library ;-))
######
"""Converts a integer base 10 to a string base 2"""
def binary(decimalInt, bigEndian = True, bits = 32, truncExcess = False):
"""
Integer to be converted is essential, Endianess is an optional flag;
me being a Win32 user, Endianess is big by default, defaults to a 32-bit
representation, most integers in Python being 32 bit. truncExcess will
strip place-holder zeros for succintness.
Oh, and it will represent 11111111 as 256, as I'm not sure whether you want
to start counting for zero with this. It's a simple matter to change."""
tempList = ['0' for x in range(bits)]
for bitPlace in range(bits, -1, -1):
if decimalInt - 2**bitPlace >= 0:
tempList[bitPlace] = '1'
decimalInt = decimalInt - 2**bitPlace
if bigEndian:
tempList.reverse()
outPut = ''.join(tempList)
if truncExcess:
if bigEndian:
outPut=outPut.lstrip('0')
else:
outPut=outPut.rstrip('0')
return outPut_______________________________________________
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