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

Build unordered list in HTML from a python list
by Nico Grubert June 30, 2010

June 30, 2010

Dear list members I have this python list that represets a sitemap: tree = [{'indent': 1, 'title':'Item 1', 'hassubfolder':False}, {'indent': 1, 'title':'Item 2', 'hassubfolder':False}, {'indent': 1, 'title':'Folder 1', 'hassubfolder':True}, {'indent': 2, 'title':'Sub Item 1.1', 'hassubfolder':False}, {'indent': 2, 'title':'Sub Item 1.2', 'hassubfolder':False}, {'indent': 1, 'title':'Item 3', 'hassubfolder':False}, {'indent': 1, 'title':'Folder 2', 'hassubfolder':True}, {'indent': 2, 'title':'Sub Item 2.1', 'hassubfolder':False}, {'indent': 2, 'title':'Folder 2.1', 'hassubfolder':True}, {'indent': 3, 'title':'Sub Item 2.1.1', 'hassubfolder':False}, {'indent': 3, 'title':'Sub Item 2.1.2', 'hassubfolder':False}, ] From that list I want to create the following HTML code: <ul id="tree"> <li>Item 1</li> <li>Item 2</li> <li>Folder 1 <ul> <li>Sub Item 1.1</li> <li>Sub Item 1.2</li> </ul> </li> <li>Item 3</li> <li>Folder 2 <ul> <li>Sub Item 2.1</li> <li>Folder 2.1 <ul> <li>Sub Item 2.1.1</li> <li>Sub Item 2.1.2</li> </ul> </li> </ul> </li> </ul> If an item of the list has 'True' for the 'hassubfolder' key than a new "<ul><li>" must be created instead of "</li>" after its title. (See "Folder 2" node in the HTML code above. My problem is: How do I keep track of the closing tags while iterating over the python list? Any help is much appreciated. Regards Nico

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Re: Build unordered list in HTML from a python list
by Jorgen Grahn June 30, 2010

June 30, 2010

On Wed, 2010-06-30, Kushal Kumaran wrote: > On Wed, Jun 30, 2010 at 2:04 PM, Nico Grubert <nicogrubert(a)yahoo.de> wrote: >> Dear list members >> >> I have this python list that represets a sitemap: >> >> tree = [{'indent': 1, 'title':'Item 1', 'hassubfolder':False}, >> {'indent': 1, 'title':'Item 2', 'hassubfolder':False}, >> {'indent': 1, 'title':'Folder 1', 'hassubfolder':True}, >> {'indent': 2, 'title':'Sub Item 1.1', 'hassubfolder':False}, >> {'indent': 2, 'title':'Sub Item 1.2', 'hassubfolder':False}, >> {'indent': 1, 'title':'Item 3', 'hassubfolder':False}, >> {'indent': 1, 'title':'Folder 2', 'hassubfolder':True}, >> {'indent': 2, 'title':'Sub Item 2.1', 'hassubfolder':False}, >> {'indent': 2, 'title':'Folder 2.1', 'hassubfolder':True}, >> {'indent': 3, 'title':'Sub Item 2.1.1', 'hassubfolder':False}, >> {'indent': 3, 'title':'Sub Item 2.1.2', 'hassubfolder':False}, >> ] >> >> From that list I want to create the following HTML code: >> >> <ul id="tree"> >> <li>Item 1</li> >> <li>Item 2</li> >> <li>Folder 1 >> <ul> >> <li>Sub Item 1.1</li> >> <li>Sub Item 1.2</li> >> </ul> >> </li> >> <li>Item 3</li> >> <li>Folder 2 >> <ul> >> <li>Sub Item 2.1</li> >> <li>Folder 2.1 >> <ul> >> <li>Sub Item 2.1.1</li> >> <li>Sub Item 2.1.2</li> >> </ul> >> </li> >> </ul> >> </li> >> </ul> >> >> If an item of the list has 'True' for the 'hassubfolder' key than a new >> "<ul><li>" must be created instead of "</li>" after its title. (See "Folder >> 2" node in the HTML code above. >> >> My problem is: How do I keep track of the closing tags while iterating over >> the python list? >> > > Use a stack? > > Whenever you start a new list, push the corresponding closing tag onto > a stack. Whenever your "indent level" decreases, pop the stack and > write out the closing tag you get. > > It's straightforward to use a python list as a stack. Or even simpler. You keep track of your current indentation level (0, 1, ...). If level==1 and you come to an indent: 2, you generate an <ul> and increase level to 2. Similarly for going left. When you reach the end you add </ul>s to go back up to level 1 (or maybe you want to call it level 0 instead). That probably assumes you use HTML (like you say) rather than XHTML (which your example hints at). In HTML you don't need to supply the </li>s. I did all this in Perl earlier today, but in my case it was unsuitable because I skipped levels (had a list of HTML headings, wanted a table-of-contents, but sometimes a <h1> was followed by <h3> with no <h2> inbetween. I'd get invalid stuff like <ul><ul>. /Jorgen -- // Jorgen Grahn <grahn@ Oo o. . . \X/ snipabacken.se> O o .

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Find slope of function given empirical data.
by Thomas June 30, 2010

June 30, 2010

Hello all. Trying to find slope of function using numpy. Getting close, but results are a bit off. Hope someone out here can help. import numpy as np def deriv(y): x = list(range(len(y))) x.reverse() # Change from [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] x = np.array(x) # to [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] y = np.array(y) # x.reverse() is used to put point 0 at end of list. z = np.polyfit(x, y, 2) print np.poly1d(z) # Returns: # 2 # 3.142 x - 18.85 x + 35.13 # 2 # Should be closer to 3.142 x - 6.283 + 10 ???????????????????? return [z[0] * 2, z[1]] if __name__=='__main__': # range(-6,5,1) # y = 3.141592 * x ** 2 - 6.283184 * x + 10 for x in range(-6, 5, 1) # 160.796416, 119.95572, 85.398208, 57.12388, 35.132736, 19.424776, 10.0, 6.858408, 10.0, 19.424776, 35.132736 # # y' = 6.283184 * x - 6.283184 for x in range(-6, 5, 1) # -43.982288, -37.699104, -31.41592, -25.132736, -18.849552, -12.566368, -6.283184, 0.0, 6.283184, 12.566368, 18.849552 # z = deriv([160.796416, 119.95572, 85.398208, 57.12388, 35.132736, 19.424776, 10.0, 6.858408, 10.0, 19.424776, 35.132736]) for x in range(-6,5,1): print str(w(x)) + ',' , # Returns: # -56.548656, -50.265472, -43.982288, -37.699104, -31.41592, -25.132736, -18.849552, -12.566368, -6.283184, -1.06581410364e-14, 6.283184 # Should be: # -43.982288, -37.699104, -31.41592, -25.132736, -18.849552, -12.566368, -6.283184, 0.0, 6.283184, 12.566368, 18.849552 # Note that the range is offset by 2 positions

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Re: [OT] Re: Why Is Escaping Data Considered So Magical?
by Jorgen Grahn June 30, 2010

June 30, 2010

On Wed, 2010-06-30, Michael Torrie wrote: > On 06/29/2010 10:17 PM, Michael Torrie wrote: >> On 06/29/2010 10:05 PM, Michael Torrie wrote: >>> #include <stdio.h> >>> >>> int main(int argc, char ** argv) >>> { >>> char *buf = malloc(512 * sizeof(char)); >>> const int a = 2, b = 3; >>> snprintf(&buf, sizeof buf, "%d + %d = %d\n", a, b, a + b); >> ^^^^^^^^^^ >> Make that 512*sizeof(buf) > > Sigh. Try again. How about "512 * sizeof(char)" ? Still doesn't make > a different. The code still crashes because the &buf is incorrect. I haven't tried to understand the rest ... but never write 'sizeof(char)' unless you might change the type later. 'sizeof(char)' is by definition 1 -- even on odd-ball architectures where a char is e.g. 16 bits. /Jorgen -- // Jorgen Grahn <grahn@ Oo o. . . \X/ snipabacken.se> O o .

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Re: pyc runtime error
by Baris CUHADAR June 30, 2010

June 30, 2010

On Jun 30, 3:10 pm, Thomas Jollans <tho...(a)jollans.com> wrote: > On 06/30/2010 01:20 PM, Baris CUHADAR wrote: > > > > > On Jun 30, 12:06 pm, Christian Heimes <li...(a)cheimes.de> wrote: > >>> Actually i wrote some scripts in python that are working as gateway > >>> controlling scripts iptables/tc/squid-proxy, and i want to execute > >>> them as cgi. Protection of source code is also important. These > >>> scripts works fine with ubuntu 9.10 and ubuntu 10.04, trying to > >>> eleminate this execution error and successfully port them to centos > >>> 5.4. Or i have to rewrite these scripts in C which is time comsuming. > > >> It looks like you have the binfmt kernel feature installed and > >> configured on your Ubuntu machines. Do you have some Python related > >> files in /proc/sys/fs/binfmt_misc/ ? > > >> Christian > > > Thanks Christian, before your message i was thinking about writing > > wrapper to turn round this issue. > > > my wrapper: > > #!/usr/bin/bash > > > /usr/bin/python m_file.pyc > > > Yes /proc/sys/fs/binfmt_misc/python2.6 is there. > > > enabled > > interpreter /usr/bin/python2.6 > > flags: > > offset 0 > > magic d1f20d0a > > > How can make it possible in centos? With custom kernel compiling? > > The binfmt_misc module has to be loaded, which is presumably is, if > /proc/sys/fs/binfmt_misc exists (not 100% sure on that) > It's almost certainly provided by CentOS, even if it's not loaded by > default. > > Assuming file.pyc was actually compiled by python2.6, and not some other > version, it should work. > > -- Thomas Yes centos5.4 loads it automatically, however little kickstart script in "/etc/rc.local" is required. is_python=$(ls -l /proc/sys/fs/binfmt_misc/python2.4 | wc -l) if [ $is_python -lt 1 ]; then echo ':python2.4:E::pyc::/usr/bin/python:' > /proc/sys/fs/binfmt_misc/ register fi i'm still digging in..

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Re: PDF Generation With Reportlab
by Tim Roberts June 30, 2010

June 30, 2010

Albert Leibbrandt <albertl(a)compuscan.co.ug> wrote: > >I am hoping there is someone out there that knows reportlab quite well. >I posted this on the reportlab mailing list but there is not much >activity on that list Never the less, that is the correct forum for this question. The ReportLab mailing list is operated and manned by ReportLab employees. They know the code better than anyone. >I am currently generating a pdf report using reportlab 2.3 and python >2.5.4. The report has a table that spans multiple pages. My problem is >that the portions on the table that continues after the first page, is >starting at a point not defined by me, so it creates a layer over the >logo which is on each page. >How do I specify the starting point of each page the table spans ? Are you talking about something more sophisticated than setting the topMargin property in the SimpleDocTemplate constructor? If you have a logo on each page, you'd want your top margin to exclude that logo. The default top margin is 1 inch. If that's not enough, extend it. If you need different margins on different pages, then you need something more sophisticated than SimpleDocTemplate. >Normally I would use pagebreak and spacers but I cannot figure out how >to fit this into the table structure. Page breaks and spacers are absolutely the wrong way to handle this. Think about this as a Word document. If you want to exclude the logo, you'd change the top margin to protect it. -- Tim Roberts, timr(a)probo.com Providenza & Boekelheide, Inc.

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Re: Why Is Escaping Data Considered So Magical?
by Roy Smith June 30, 2010

June 30, 2010

In article <mailman.14.1277891765.1673.python-list(a)python.org>, Cameron Simpson <cs(a)zip.com.au> wrote: > Jeez. PDP-11s, 16 bit addressing, tiny tiny disc drives! What you talking about, tiny? An RK-05 was huge! Why would anybody ever need more than that? > The original V7 (and probably earlier) UNIX filesystem has 16 byte directory > entries Certainly earlier. I used v6, and it was like that there. I'm reasonably sure it pre-dated v6, however.

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Re: pyc runtime error
by Baris CUHADAR June 30, 2010

June 30, 2010

On Jun 30, 12:06 pm, Christian Heimes <li...(a)cheimes.de> wrote: > > Actually i wrote some scripts in python that are working as gateway > > controlling scripts iptables/tc/squid-proxy, and i want to execute > > them as cgi. Protection of source code is also important. These > > scripts works fine with ubuntu 9.10 and ubuntu 10.04, trying to > > eleminate this execution error and successfully port them to centos > > 5.4. Or i have to rewrite these scripts in C which is time comsuming. > > It looks like you have the binfmt kernel feature installed and > configured on your Ubuntu machines. Do you have some Python related > files in /proc/sys/fs/binfmt_misc/ ? > > Christian Thanks Christian, before your message i was thinking about writing wrapper to turn round this issue. my wrapper: #!/usr/bin/bash /usr/bin/python m_file.pyc Yes /proc/sys/fs/binfmt_misc/python2.6 is there. enabled interpreter /usr/bin/python2.6 flags: offset 0 magic d1f20d0a How can make it possible in centos? With custom kernel compiling?

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1.5.1 Py_XDECREF Core
by Sunil June 30, 2010

June 30, 2010

Hi, We are using a legacy product which is using 1.5.1 version of Python and we have seen frequent core dumps offlate which is as below #0 0x2b79b0 in list_dealloc (op=0x414b11d0) at listobject.c:220 #1 0x283c48 in dict_dealloc (mp=0x415b8c18) at dictobject.c:491 #2 0x2b4760 in frame_dealloc (f=0x4042ea50) at frameobject.c:116 #3 0x28b938 in eval_code2 (co=0x404a4d28, globals=0x4049bec8, locals=0x0, args=0x404da5dc, argcount=1, kws=0x0, kwcount=0, defs=0x0, defcount=0, owner=0x0) at ceval.c:1873 #4 0x28d690 in call_function (func=0x41497958, arg=0x404da5d0, kw=0x0) at ceval.c:2472 Can someone confirm if this is a problem at Python or in the source code, I know that this version is quite old and needs upgarde, but since this in use for long i would need evidence to prove that this is a problem at Python not in the product so that we can upgrade to the latest version. listobject.c for (i = 0; i < op->ob_size; i++) { Py_XDECREF(op->ob_item[i]); //Line 220 } Can some one help me out in this, while i belive that the pointer where the derefernece is happening might have got corrupted but this happens rarely and the code is a provisioning script with a command that is successful most times. Regards Sunil

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Re: pyc runtime error
by Baris CUHADAR June 30, 2010

June 30, 2010

On Jun 30, 11:31 am, Rami Chowdhury <rami.chowdh...(a)gmail.com> wrote: > On 2010-06-30 01:06, Baris CUHADAR wrote: > > > Can anyone explain this unexpected behavior? > > I'm sorry -- can you let us know what behavior you're expecting? > > > all files chmod 755, i've compiled x.py with py_compilefiles, > > also tried within python console with "import x" > > > system: centos 5.4 32bit > > > This a PATH related problem i think? > > Perhaps I'm misunderstanding what you're trying to do but from what I can > see, you are expecting .pyc files to be directly executed by the shell. And > as I understand them, they are *not* meant to be directly executed by the > shell at all -- they're simply a sometimes-useful shortcut for the Python > interpreter. > > Python scripts like your x.py, however, *are* meant to be executed by the > shell. Have you tried: > > [user@box cgi-bin]$ ./x.py > > ? > > > [root@centos-14 cgi-bin]# ./x.pyc > > May I ask, as well, why you're doing all of this as root? > > > > > [root@centos-14 cgi-bin]# python x.pyc > > Content-Type:text/html > > > python > > 2.4.3 (#1, Sep 3 2009, 15:37:12) > > [GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] > > > -------------------------------------------------------------------------------------------- > > > x.py file content: > > > #!/usr/bin/env python > > > print "Content-Type:text/html\n\n" > > print "python" > > import sys > > print sys.version > > > -------------------------------------------------------------------------------------------- > > > -- > >http://mail.python.org/mailman/listinfo/python-list > > Thank you for your replies. This machine is a local virtual test machine so security issues are omitted. Actually i wrote some scripts in python that are working as gateway controlling scripts iptables/tc/squid-proxy, and i want to execute them as cgi. Protection of source code is also important. These scripts works fine with ubuntu 9.10 and ubuntu 10.04, trying to eleminate this execution error and successfully port them to centos 5.4. Or i have to rewrite these scripts in C which is time comsuming. On centos 5.4, i think httpd tries to execute it as i did "./x.pyc".

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