Re: templates
I haven't got around to trying HTMLTemplate yet but it is on my list of things to do. It would be great to see how it compares in perfomance and simplicity to PyMeld and other DOM approaches. -- http://mail.python.org/mailman/listinfo/python-list
Re: templates
Yes I looked at that but I did not benchmark it. Basically it seems to convert the Meld or part of a Meld into a %s template in any case and I already knew that %s performace was very good. So if I had used PyMeld combined with %s then sure it would be much faster but I wanted to benchmark a pure PyMeld approach against a pure %s approach. You are right thought that this could significantly speed things up if one was prepared to use a dual approach (less clean but I would still use it if it was convenient). -- http://mail.python.org/mailman/listinfo/python-list
Re: templates
I would like to give a few more specifics about my "benchmarking". The web page had about 10 simple fields and a table of roughly 30 table rows. The method of generation the table rows was exactly the same as the example in the PyMeld documentation ie you create the Meld, you make a copy of a prototypr row instance, you generate your new rows, which may have replaceable fields inside them, and finally you replace the single prototype row with all the new rows you have generated. The same test using the same data with Cheetah and native templates resulted in (on an oldish 600Mhz box): PyMeld: +-300ms Cheetah: +-30ms Native %s: +- 5ms On newer hardware obviously the times will be very different but this particular application has to be able to scale to very large tables. I did not try PyMeldLite because the HTML I am using is exactlty that: HTML and not XHTML. Again I am not criticising PyMeld, I love its simplicity and clean api and the code is easily understandable so I will probably take a look at it again at some time. Also its great that it works with any snippet of HTML code it does not even have to be valid HTML and I get a lot of invalid HTML from the designers. Regarding Cheetah, I was using Cheetah 1.0. There is a 2.0 Release Candidate out but I didnt want to be using anything in RC status for a production site. -- http://mail.python.org/mailman/listinfo/python-list
Re: templates
I have used PyMeld (http://www.entrian.com/PyMeld/) which is one of very few that gives a 100% separation of code and presentation, in fact PyMeld is not strictly speaking a template system at all. I have also used Cheetah. (http://www.cheetahtemplate.org/) However for a recent project (http://muti.co.za) I ended up using Python's built in %s templating engine. The reason for this was performance. The %s native system is extremely fast. In my somewhat informal benchmarks PyMeld was two orders of magnitude and Cheetah one order of magnitude slower than Python native templates. I don't mean to criticze these two systems, they are both excellent, and I probably could have spent some time trying to figure out why they were so much slower but in the end it was quicker for me to go with something I knew was super fast. I did try compiling the Cheetah templates which provided a small performace boost but it was still much slower than native templates. (I also tried the new $ based native template system in Python 2.4 but it doesnt have the flexible formatting support that the % one has) -- http://mail.python.org/mailman/listinfo/python-list
Re: Indentation/whitespace
Yes, thats what you have to do. And that was my original point, you cannot just paste and go, you have to first reformat. -- http://mail.python.org/mailman/listinfo/python-list
Re: Indentation/whitespace
>It just has to be consistent within a *single* block. Correct, and therein lies the problem I am describing. If someone has used two spaces and you paste into the SAME block where you are using four spaces you will break your code. -- http://mail.python.org/mailman/listinfo/python-list
Re: Indentation/whitespace
>That's hardly Python's fault. That's a problem with lousy browsers, >editors etc. which add word-wrapping or remove whitespace. >Complain to the >browser developers. While I have no doubt that there are lousy browsers out there, the problem is not only with browsers, but also I agree with you its not Python's fault. The issue is that the code I am pasting may have used a DIFFERENT indentation scheme, so lets say I used four spaces and the code I am pasting used two spaces, or worse yet, a tab, that is where the problem arises. Now assuming that the browser and the copy and paste buffers dont screw up the indentation, when I paste that code into my editor that is where the problem arises. Sure if everyone stuck to the recommended 4 spaces in the style guide it would help. But even then in the context of your program you may be a further level of indentation. I dont know if trying to make the editor any cleverer would help either. You could get it to simply replace the indentation in the newly pasted code to the same as the surrounding code, (and there may even be some Python modes that do that already) but that may not always be what you wanted! -- http://mail.python.org/mailman/listinfo/python-list
Re: Indentation/whitespace
I consider myself a fairly experienced Python coder and although I am
not "uncomfortable" with significant whitespace there are a few places
where I do find it annoying and I wouldnt mind an alternate block
delimitation syntax. I would prefer something like the ruby "end"
though rather than '{' and '}'. The place I find it annoying is in
pasting snippets of code from say web pages. I very often google for a
piece of code and then paste it into my editor and almost always the
pasted piece of code has different indentation and causes a compiler
error. Sometimes in vim "100==" fixes it but very often not. It would
be nice if you could use an "end" delimiter for quick experimentation
with code and then later on go and remove the "end" and fix the
indentation.
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Re: Indentation/whitespace
It is not really unique to Python as I have pointed out on this or other forums before. The Occam (OCCAM?) language also uses significant whitespace in much the same way as Python and there may also be others. -- http://mail.python.org/mailman/listinfo/python-list
Re: bsddb185 question
Martin you are great!
If I had just opened the file with f=bsddb185.hashopen('filename',''w')
it would have worked the first time.
So now I will create wrapper classes around the file classes of
bsddb185 and create the methods that I need to keep it consistent
with bsddb. Another small difference I noted is that bsddb seems
to auto sync() while bsddb185 does not, this is not a big issue though.
Thanks very much for all your input!
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Re: bsddb185 question
Thanks Martin However the line: del db[key] results in an error: (1, 'Operation not permitted') (only tested on Python 2.3.5) Could this be because the .del() method of the dictionary has not been implemented either? In fact in my tests any attempt at altering the db by use of normal dictionary methods fails with the same error. e.g. db['newkey']='newvalue' causes the same error. (again, only tested on Python 2.3.5) So it seems only those methods listed by dir() have been implemented, which is what I would expect. Thanks for your info on the rules for interface implementation in Python. That is an interesting difference. I have grown to like the rules for java interface implementation because you are guaranteed that all defined methods for the interface have been implemented. That is what is meant by "implementing" an interface in java. Although I dont deny the Python way may also have its advantages, just different ones! -- http://mail.python.org/mailman/listinfo/python-list
Re: bsddb185 question
Ok but if you read my original post I already said that! The issue is that I have an application that needs to share data with an existing Berekeley db 1.85 database and applications in perl. Sure if I was creating the database myself I would use the newer bsddbmodule but I can't require the perl code be rewritten, so is there any way in Python to read and write to a legacy 1.85 Berkely db? -- http://mail.python.org/mailman/listinfo/python-list
Re: bsddb185 question
It seems it doesnt implement ALL of the dictionary interface though.
dir({}) yields many more methods than dir(bsddb185.open(f)).
So bsddb185 is missing many of the methods that I am used
to in bsddb. I mentioned some above that are missing, pop()
in particular would be useful in my situation but there are
others as well.
>From a java perspective I believe that its not possible to omit certain
methods when implementing an interface, I am not sure about Python
though.
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bsddb185 question
I have an application that needs to create and delete records in a Berkeley DB version 1.85 database. If I use the bsdddb185 module I dont see any of the record manipulation methods in there that are available in the newer bsddb module. (put(), get(), pop() etc) I know the docs say that one should always use the newer bsddb module however it appears that the bsddb module is unable to open version 1.85 databases. So it seems I am forced to use the bsddb185 module which does not have convenient record level methods. Am I missing something here or have others eperienced tha same? -- http://mail.python.org/mailman/listinfo/python-list
Re: HTML generation vs PSP vs Templating Engines
I just do the following: I store the form data as a pickeled dictionary. Then I create my HTML form with something like this: HTMLout=""".. .. ''' where the field1, field2 etc era the fields on my form. Then finally: print HTMLout % dict where dict has all the values that I previously pickled. You have to do some additional trickery for type fields and checkboxes and so on but its really not difficult. -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl.flock() not working when called from a function
Thank you both for your replies. You are both quite correct and upon testing I get the desired results. I was mistakenly expecting the execution of the function to block at the fcntl.flock(f,fcntl.LOCK_EX) line. But I am slowly getting my head around it. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and Lotus Notes
I have had success with jython using the notes.jar classes, for
example:
import lotus.domino
import java.io
import java.net
import java.lang
import java.util
lotus.notes.NotesThread.sinitThread()
S = lotus.notes.Session.newInstance();
db=S.getDatabase("server/domain","domlog.nsf")
agent=db.getAgent("DeleteOldDocs")
for x in range(50):
print x
result=agent.runOnServer()
print "res %d" % result
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fcntl.flock() not working when called from a function
The following code works as expected when run in the main body of a
python script (ver 2.3.5) on OpenBSD v3.8. but when it is in the body
of a function definition it does not work. It does not raise any errors
but it simply does not block as expected. I have repeated this in both
a cgi envirnoment and a non-cgi environment. I also have repeated it
under OpenBSD 3.6 Python Version 2.3.4. To test this you need to run
the code from two shells or if testing the cgi version from two
browsers.
The first call to flock() should pass without blocking while the second
call should block.
I have tried varying the file open mode by using 'r', 'r+', 'w', 'rw',
'w+', and always I get the same results.
Does anyone have an idea why this would work in the main body of the
script but not in a function?
This code works if in the main body of a script:
import fcntl
f=open('/tmp/lockfile')
fcntl.flock(f,fcntl.LOCK_EX)
but this does not work:
import fcntl
def lock():
f=open('/tmp/lockfile')
fcntl.flock(f,fcntl.LOCK_EX)
lock()
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Re: Simple prototype text editor in python
Thanks for everyones advice. I finally went for a very basic BSD style template that I found somewhere. Its really short and easy to understand, at least to me! -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple prototype text editor in python
Thanks Robert I have packaged it up with distutils and included the license in the README.txt file. I think I am missing something as I have only seen a place (under submissions) on http://python.org/pypi?%3Aaction=submit_form to submit the PKG_INFO file, or to submit a url manually but nowhere to actually upload the distribution file. (the tar.gz file) Am I looking in the wrong place? Or is it acceptable to post a .tar.gz file in place of the PKG_INFO file? -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple prototype text editor in python
Hi Viktor At the moment I dont have any web site where I can upload it. Do you or anyone have any suggestions or know of any web sites where one can post python code? If not please email me and I will send you the code by email. Regarding the license I have not yet decided what type of license (if any, since its very few lines of code) but probably will be GPL or BSD style. I have no former experience in licensing code so any suggestions will be welcome there as well. (For one, do you know if simply stating somewhere in the code "This is licensed under blah blah" is sufficient to consider the code licensed?) -- http://mail.python.org/mailman/listinfo/python-list
