🌐 Mailman 3 September 2010 - Python-list - python.org

Re: Unicode usenet posting. This is a test.
by Xah Lee Sept. 26, 2010

Sept. 26, 2010

On Sep 26, 5:40 am, Spiros Bousbouras <spi...(a)gmail.com> wrote: > > And just for good measure, some «European style quotes» and “balanced smart > > quotes” which I intend some day to try to convince people to start using > > to eliminate the scourge of backslash escapes. But that's a topic for > > another day. > > I don't see how they would help to eliminate backslash escapes. Let's > imagine that strings were delimited by « and ». If you wanted a > string which contained a » you would still need to escape it. I thought about these, but ultimately I don't think it is avoidable. However, using matching pairs eliminate many unnecessary escapes. For example in my recent essay about html6, I thought about the escape issue. Ultimately, if your content refers to the language itself, then you will need escapes, unless your language can switch to another quoting mechanism. For example, in perl: "this" 'this' q[this] q(this) q{this} print <<'xyzxyz'; this xyzxyz Are all equivalent. (technically except the last one which contains extra new line) Note that it has variable quoting chars. Similarly with Python. e.g. "this" 'this' """this""" '''this''' In python , the variability is less than perl. Now, suppose, if you need to quote perl code in perl itself or python in python. e.g. suppose you are writing a perl script that parse a perl snippet that contains all perl lang's quoting mechanisms, then, basically you'll start to need escapes. (worse when this is nested. A practical example that happens to me often is when writing a blog in html about using perl to parse html, and the html contains complex javascript or php, which may contain regex string, and you need to show the perl source code in html marked up syntax highlight.) in the study of symbolic logic, this is a form of self reference, and is a unavoidable problem (to not to have to escape chars yet still want the ability to quote the lang itself). the variable quoting chars also introduces some complexity. Namely, your lang at syntax level is no longer simple. e.g. in emacs lisp, whenever the symbol straight double quote appears, it has only one meaning (unless in special cases such as in comments or being escaped). Or, when you need to get strings in a lang, the only char you need to look for is double straight quote. In langs with variable quotes such as perl, this can no longer be true, in one or both ways. doesn't matter which is your philosophy in lang design with regards to quoting mechanism, unicode introduce many proper matching pairs that are helpful, and avoid multiple semantic meanings for a given char. in a similar way, this is one of my pet peeve in math notation and computer lang syntaxes. e.g. In Mathematica, paren is used for one single purpose only, always. Namely, grouping. The square bracket [] has one single purpose only, namely as bracket for function arguments. The curly brackets {} again has one single purpose only, as a syntax sugar for list, e.g. List[1,2] is the same as {1,2}. In traditional math notation and most comp langs, it's all context dependent soup. • 〈Strings in Perl and Python〉 http://xahlee.org/perl-python/quoting_strings.html • 〈Strings in PHP〉 http://xahlee.org/php/quoting_strings.html • 〈HTML6, Your HTML/XML Simplified〉 http://xahlee.org/comp/html6.html • 〈Matching Brackets in Unicode〉 http://xahlee.org/comp/unicode_matching_brackets.html Xah ∑ xahlee.org ☄

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xml.etree - why no HTMLTreeBuilder included?
by Jon P. Sept. 26, 2010

Sept. 26, 2010

It is great that Fredrik Lundh's ElementTree is now a part of the Python Standard Library. However, Is it correct that if you want to use xml.etree.ElementTree to parse an HTML Document that you will have to install a separate HTMLTreeBuilder (e.g. TidyHTMLTreeBuilder) and that the only TreeBuilder objects that come with the Standard Library is the one for XML source? Seems like some kind of HTMLTreeBuilder ought to be included by default. For a script I'm doing which deals with HTML, I thought I could jettison lxml and use xml.etree instead, but since I would need to have to ask the end-user to install an external library anyways even if I use xml.etree, I switched back to lxml.

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creating python daemon ?
by vineet daniel Sept. 26, 2010

Sept. 26, 2010

Hi I have succesfully created daemon with python script and as next step I am trying to give input to that python script daemon from Apache Logs....here I have got stuck and I have even checked IRC python channel for solution. Apache is able to call the file but fails to execute it properly and I get this error continuosly : piped log program '/var/www/html/test.py' failed unexpectedly How do I rectify the above error and make adjustment to the code so that it takes input from apache. code that I am using is as follows : #! /usr/bin/env python import sys,os pid = os.fork() os.chdir("/var/www/html/") os.setsid() os.umask(0) #this line will read apache log in real time as redirected from the CustomLog directive of Apache. log = sys.stdin.readlines() f = open('/var/www/logmongo.txt','a') # append log to this text file f.write(log) I'd appreciate if anybody could share the code that they used for daemon or used with Apache CustomLog directive.

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Python2.7 on OSX
by Jonas Galvez Sept. 26, 2010

Sept. 26, 2010

Just installed Python2.7 on my OSX Leopard with make altinstall. No missing dependencies, but I have one annoying problem: the delete key prints '^H' on the Python shell. Does anyone know how to fix that? Thanks in advance, -- Jonas

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Re: Qt not working o Wing ide 3.2
by Detlev Offenbach Sept. 26, 2010

Sept. 26, 2010

Thomas Jollans wrote: > On Sunday 26 September 2010, it occurred to tayfuryılmaz to exclaim: >> hi everyone ı develop a program with pythoon and qt on wing ide >> ı use pyqt module in my program bu when ı debug a program,python is >> not debugging and o.s show a screen for solution.. and solution says >> python is not debugging. can he/she explain this solve problem.. >> thanks >> regards.. > > Quite frankly, I don't have the faintest idea what you're getting at. > You'll have to be a lot clearer and more precise if you want to enable > us to offer you useful help. > > * Minimal example script? > * exact output (traceback!) of Python? > * possibly, exact output of some other component? > > Just a thought - if you're using Wing IDE, you probably paid for it? > Did you also pay for a support contract? Maybe that's part of the deal? > If it is, maybe you should phone them up - they probably know a lot > more about Wing IDE than most of us here. Alternatively I would recommend the eric IDE, which is free and works very well with PyQt (actually it is written in PyQt). And it is available for Python2 and Python3. Regards, Detlev -- Detlev Offenbach detlev(a)die-offenbachs.de

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adding a method to an existing builtin class
by TP Sept. 26, 2010

Sept. 26, 2010

Hi everybody, Today I have learned a bit of the news of Python 3.0 compared to 2.4 version. By the way, I have asked myself if it is possible to add a method to a builtin type as 'unicode': >>> a="foo" >>> type(a) <type 'unicode'> >>> print(dir(a)) ['__add__', ..., 'zfill'] For example, I would like to add a "colorize" method to 'unicode' objects. Is this possible? Or am I compelled to derive the unicode builtin as below: class my_unicode(unicode): def __init__( self, unicode_string ): super( my_unicode, self ).__init__( ) def colorize( self ): return "\x1b[93;102m" + self + "\x1b[0m" my_unicode_string = my_unicode( "coucou" ) print( type( my_unicode_string ) ) print( my_unicode_string.colorize() ) print( my_unicode_string.upper() ) Thanks, Julien -- python -c "print ''.join([chr(154 - ord(c)) for c in '*9(9&(18%.\ 9&1+,\'Z4(55l4('])" "When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong." (first law of AC Clarke)

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Qt not working o Wing ide 3.2
by tayfuryılmaz Sept. 26, 2010

Sept. 26, 2010

hi everyone ı develop a program with pythoon and qt on wing ide ı use pyqt module in my program bu when ı debug a program,python is not debugging and o.s show a screen for solution.. and solution says python is not debugging. can he/she explain this solve problem.. thanks regards..

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Re: sequence multiplied by -1
by BartC Sept. 26, 2010

Sept. 26, 2010

"Yingjie Lan" <lanyjie(a)yahoo.com> wrote in message news:mailman.1050.1285403326.29448.python-list@python.org... > Hi, > > I noticed that in python3k, multiplying a sequence by a negative integer > is the same as multiplying it by 0, and the result is an empty sequence. > It seems to me that there is a more meaningful symantics. > > Simply put, a sequence multiplied by -1 can give a reversed sequence. > > Then for any sequence "seq", and integer n>0, we can have > > "seq * -n" producing "(seq * -1) * n". > > Any thoughts? Gimmicky. Best to define multiplication only by unsigned or positive values. -- Bartc

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Re: equivalent of bash "set -x" in Python
by TP Sept. 26, 2010

Sept. 26, 2010

James Mills wrote: > What do you mean by "command" ? For example, print statements, but it could extend to class definitions, etc. I am going to examine the solution given by Chris. Cheers, Julien -- python -c "print ''.join([chr(154 - ord(c)) for c in '*9(9&(18%.\ 9&1+,\'Z4(55l4('])" "When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong." (first law of AC Clarke)

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equivalent of bash "set -x" in Python
by TP Sept. 26, 2010

Sept. 26, 2010

Hi everybody, I am interested in having the possibility to print every Python commands in a script (for didactic purpose). So I am looking for some sort of equivalent of bash "set -x". Does it exist? Thanks Julien -- python -c "print ''.join([chr(154 - ord(c)) for c in '*9(9&(18%.\ 9&1+,\'Z4(55l4('])" "When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong." (first law of AC Clarke)

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