Re: [Tutor] Converting MAC address . Need Help
On 2/27/06, Kent Johnson <[EMAIL PROTECTED]> wrote: > This is not what Sudarshana asked for - '\\x00' and '\x00' are not the > same string Thanks for clearning that up for me, Kent. -- Regards, Travis Spencer ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Converting MAC address . Need Help
On 2/27/06, Kent Johnson <[EMAIL PROTECTED]> wrote:
> Sudarshana KS wrote:
> > The problem i am facing is the mac address i have is in the form
> > 00:11:22:33:44:55 need to convert to '\x00\x11\x22\x33\x44\x55'
Perhaps I'm mistaking but it seems that you need to prepend the `\x'
escape sequence to the mac address you already have and replace the
colons with the same sequence. If it is any harder than that, I'm
missing something. If I got what you mean, Sudarshana, you can
achieve your goal with this one-liner:
>>> macAddress = '00:11:22:33:44:55'
>>> reduce(lambda a, b: a + r"\x" + b, macAddress.split(':'), "")
'\\x00\\x11\\x22\\x33\\x44\\x55'
Perhaps you may prefer this:
>>> "\\x" + macAddress.replace(":", "\\x")
'\\x00\\x11\\x22\\x33\\x44\\x55'
> The list elements are still strings, you need to convert them to
> integers.
Why is this needed, Kent? Why not just leave them as strings?
> The strings are in hexadecimal so use the optional base
> parameter to int():
> >>> int('11', 16)
> 17
>
> Finally you have to convert this number to a byte of a string using chr():
> >>> chr(17)
> '\x11'
Seems like a lot of extra work to me.
--
Regards,
Travis Spencer
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Re: [Tutor] Parsing os.popen(command) output
On 9/11/05, Bill Burns <[EMAIL PROTECTED]> wrote: > Like I said, it does work but can it be improved upon? The variable names could stand some improvement. p, r, s, tmp, i, etc. aren't very explanatory. If you choose better names, your coworkers, not to mention your future self, will be very thankful. -- Regards, Travis Spencer ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] convert binary to ascii
On 9/2/05, Danny Yoo <[EMAIL PROTECTED]> wrote:
Hey Danny,
> If we have strings of ones and zeros, we can turn those into numbers by
> using the int() function. For example:
>
> ##
> >>> int("101", 2)
> 5
> >>> int("110", 2)
> 6
> >>> int("111", 2)
> 7
Oh, that's nice. I guess my solution was the total C hacker's way;
not very pythonic :-) Thanks for the info.
--
Regards,
Travis Spencer
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Re: [Tutor] convert binary to ascii
On 9/2/05, Servando Garcia <[EMAIL PROTECTED]> wrote: > Hello Hey Servando, > Here is my question : sam in binary is 01110011 0111 01101101. >if given 01110011 0111 01101101 how would I go back to ascii. > I guess am asking is there a module that will do this conversion for > me. I don't know about module, but it isn't hard to do it yourself. Here is one way: #!/bin/env python import sys for line in sys.stdin: result = "" for binaryStr in line.split(): j = len(binaryStr) - 1 i = charCodeOfBinaryStr = 0 while j > 0: charCodeOfBinaryStr += int(binaryStr[j]) * 2 ** i j -= 1 i += 1 result += chr(charCodeOfBinaryStr) print result Here is the output of your binary string: $ python btoa.py <<< "01110011 0111 01101101" sam Its a really common algorithm. Google for "change of base algorithm" and you'll probably find lots of explinations. HTH. -- Regards, Travis Spencer ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Directory permission and ACLs
On 9/2/05, Pat Martin <[EMAIL PROTECTED]> wrote: > I am new to python and wanted to write a program that looks at directory > permissions and ext3 ACLs and also change them if needed. What modules > would I be looking at for those functions? os and os.path: * http://docs.python.org/lib/module-os.html * http://docs.python.org/lib/module-os.path.html stat and shutil might be useful too. HTH. -- Regards, Travis Spencer ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Writing to XML file with minidom
On 8/31/05, Danny Yoo <[EMAIL PROTECTED]> wrote: > Hi Travis, Hey Danny, > Putting pure binary bytes in an XML file has a flaw: the issue is that the > binary bytes themselves might contain characters that could be interpreted > as XML! Even if we wrap the content in CDATA, there's nothing that really > stops the bytes from containing the characters "]]>" to prematurely close > off the CDATA tag. Oh, sure. I didn't think that through, and if I had, I wouldn't have know how to work around it. > To get around this, we can use a technique called "ascii-armor" to wrap > protection around the troublesome binary text. > > http://en.wikipedia.org/wiki/ASCII_armor Brilliant. I won't forget the term "ascii-armor" if I ever find myself in Johan's shoes and I've forgotten the details. > (Hey, look, an Elf! *grin*) HA! > Hope this helps! Tremendously. Thanks, Danny! -- Regards, Travis Spencer ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Writing to XML file with minidom
On 8/30/05, Johan Geldenhuys <[EMAIL PROTECTED]> wrote: > One snag that I found is that the des encryption that I used for the data > that is > written back, it is not parsed correctly when the file is read again with the > new > data in it. There is non-printable characters or non-ascii chars in that > gives errors > from expat when the contents is parsed. > I had to use a different encryption algorithm. I am going to do some tests on > it > now. Put the cyphertext in a CDATA section, so the parser knows to ignore its contents: -- Regards, Travis Spencer P.S. Please don't send HTML e-mails. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
