Re: Implicit initialization is EXCELLENT
Hello, I agree with the contents of this post. I see a similar problem with API's requiring to initialize all kinds of data using setters/properties instead of receiving it in the initializer (or constructor). Python generally follows this design. Apart from files, I can't easily think off the top of my head of any types that require a separate open/start/activate call before they are usable. database connections, network connections, spawning expensive processes/threads, things that benefit from lazy evaluation... Now, I have an ulterior motive in raising this issue... I can't find the original article I read! My google-fu has failed me (again...). I don't suppose anyone can recognise it and can point me at it? My sarcasm detector warns me not to add a link, although perhaps it's time for recalibration (after all, summer season started) :-) Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: Implicit initialization is EXCELLENT
No! I was serious. I've spent *ages* trying to find the link to the article... if you know it, please share. Ok - I thought you were referring to some troll's rant with similar title. I'm probably way off, but were you referring to the RAII technique? http://en.wikipedia.org/wiki/Resource_Acquisition_Is_Initialization -- http://mail.python.org/mailman/listinfo/python-list
Re: list comprehension to do os.path.split_all ?
Hi,
[python 2.7] I have a (linux) pathname that I'd like to split
completely into a list of components, e.g.:
'/home/gyoung/hacks/pathhack/foo.py' --> ['home', 'gyoung',
'hacks', 'pathhack', 'foo.py']
Not sure what your exact requirements are, but the following seems to work:
pathname = '/home/gyoung/hacks/pathhack/foo.py'
print pathname[1:].split("/")
Note that this would only work for absolute linux paths (i.e. starting
with "/").
Best regards,
Stefaan.
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Re: Python IDE/text-editor
Here's a mockup of the app I'm looking for: http://i52.tinypic.com/2uojswz.png Which would you recommend? You drew editra! http://editra.org/preview -- http://mail.python.org/mailman/listinfo/python-list
Re: Python IDE/text-editor
Thanks for all the suggestions, glad I found the right one! You're welcome :D -- http://mail.python.org/mailman/listinfo/python-list
Re: Easiest framework to develop simple interactive web site in python?
The simplest one to learn is web2py http://www.web2py.com No configuration needed, just unpack and get started. It also has very good documentation and tons of little examples to get things done. The other options you mentioned are good too :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Usefulness of the "not in" operator
So what is the usefulness of the "not in" operator ? Recall what Zen of Python tells There should be one-- and preferably only one --obvious way to do it. the zen of python also says (amongst other things): ... Readability counts. ... Although practicality beats purity ... Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
auto upgrade scripts?
Hello list, Is anyone aware of a (light-weight, easy-to-use) auto-upgrade framework for python scripts? I find it hard to believe no one has wanted this before, yet google doesn't find too much relevant stuff. Thanks, Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: auto upgrade scripts?
> Auto-upgrade from what to what? > -Larry Bates Interesting question. In my case I want my program to check for (e.g.) bug-fix releases on some location (network drive or ftp), and if available, allow to automatically download and install them. Kind of like the AutoUpgrade functionality in .net (*shudder*) ;) Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: auto upgrade scripts?
> Since you mention .NET and didn't state otherwise, I'm assuming > Windows platform? No, I need both linux and windows. I guess this means I'll have to make something myself ... Thanks, and best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to determine if one char of many in a string
An entirely different approach would be to use a regular expression:
import re
if re.search("[abc]", "nothing expekted"):
print "a, b or c occurs in the string 'nothing expekted'"
if re.search("[abc]", "something expected"):
print "a, b or c occurs in the string 'something expected'"
Best regards,
Stefaan.
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Re: p2exe for python 2.6
How can convert my python script in exe for the python version 2.6? You must use a standalone executable builder like * py2exe (Windows) * py2app (Mac OS) * PyInstaller (all platforms) * cx_Freeze (Windows and Linux) * bbFreeze (Windows and Linux) Presumably you could use GUI2EXE [1] as a graphical front-end to these tools (never tried this myself). Best regards, Stefaan. [1] http://xoomer.alice.it/infinity77/main/GUI2Exe.html -- http://mail.python.org/mailman/listinfo/python-list
Re: Building musical chords starting from (a lot of) rules
The costrunction of a chord is based on a root note and a structure,
so by default, giving just a note, it creates a major chord adding the
third and fifth note.
Quite some time ago I wrote something to solve the reverse problem:
given a list of note names, find out a chord name.
(http://chordrecognizer.sourceforge.net/ )
I used a look-up table to made a correspondence between the chord-name
and the notes from which the chord is built. The notes are expressed as
a distance from the root note.
E.g. starting from a chromatic scale built on C, the distances would be:
C:0 C#:1 D:2 D#:3 E:4 F:5 F#:6 G:7 G#:8 A:9 A#:10 B:11
(and similar for flats, double sharps and double flats, ...)
Any chord thus can be constructed from a root note + the distance
information.
example distance information:
{ 'm' : [ 0, 3, 7 ],# minor triad
'' : [ 0, 4, 7 ],# major triad
'7' : [ 0, 4, 7, 10] # etc...
...
}
How does one e.g. construct the E7 chord from this information?
1. generate the chromatic scale starting from E, and annotate with note
distance to root note:
E:0 F:1 F#:2 G:3 G#:4 A:5 A#:6 B:7 C:8 C#:9 D:10 D#:11
2. take the recipe for a '7' chord from the distance information:
[0, 4, 7, 10]
3. map the numbers from step 2. to the note names from step 1.: E G# B D
If you care about proper enharmonic spelling of the chord's note names
(i.e. do not confuse F# and Gb), you will need to add some extra
information in the look-up tables or you need to pass extra information
to the chord construction recipe at the moment of creating a chord, but
that is left as an excercise to you - the interested reader ;)
HTH,
Stefaan.
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Re: Using Python after a few years of Ruby
Hi, 1) Is there anything like a Python build tool? (Or do I even need something like that?) If you're going to run the python source code, you don't need anything. Python builds what it needs automagically. Some tools exist to build stand-alone executables though, if you'd like to do so (e.g. py2exe, http://www.py2exe.org) 3) Web frameworks I quite like the powerful and very intuitive and easy to use web2py (http://www.web2py.com). (not to be confused with the minimalist web framework web.py, http://webpy.org). Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: html ui + py background? any tut?
Perhaps you want to investigate pyjamas[1] and pyjamas-desktop[2] [1] http://pyjs.org/ [2] http://pyjd.sourceforge.net/ Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: html ui + py background? any tut?
Or maybe you are looking for something like nufox? http://nufox.berlios.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: regarding SWIG
Hi.. I'm new to SWIG and need to create Wrapper for C code, so, I have installed the SWIG already but doesnot know how to run it for generating Interface file... As far as I understand, SWIG will not generate an interface file for you. You have to write it yourself, to tell SWIG what parts of your API you want to expose in python. HTH, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: I donä't get while-loops
def read2():
expr = ""
while expr != "quit":
expr = raw_input("Lisp> ")
print parse(expr)
read2()
^
print "Good session!"
You shouldn't call read2() inside read2()...
just remove that line and retry...
Each time you call read2() recursively, a
new expr is initialized to "", so the condition
never becomes true
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Re: Profiling weirdness: Timer.timeit(), fibonacci and memoization
Nothing weird about this ... The difference will become larger as your input value becomes larger. You can easily understand why if you try to calculate fib(10) by hand, i.e. work through the algorithm with pencil and paper, then compare the work you have to do to the memoized version which just takes fib(9) and fib(8) from memory and adds them together. Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: raw_input on several lines
How can I change this behavior, so that another action is needed to stop the input? For example, CTRL-G. It would allow the user to input several lines. I don't think you can change raw_input's behaviour in this respect, but you could build something yourself that's based on interpretation of raw keyboard scan codes. Google is your friend in this... e.g. on Linux you could use something like urwid e.g. on win32 you could use something like http://code.activestate.com/recipes/197140/ I am not aware of an os independent way to accomplish what you want. -- http://mail.python.org/mailman/listinfo/python-list
Re: Distribution of Python Scripts
So, what's my options. Maybe this page can give some inspiration? http://wiki.python.org/moin/deployment -- http://mail.python.org/mailman/listinfo/python-list
Re: A web site using Python
1. Pick a web framework, I'd suggest looking at: web2py: http://web2py.com - probably the easiest to install (no configuration needed) and learn. Suitable for both small and big projects. No worries when upgrading to a newer version as backward compatibility is an explicit design goal. -- http://mail.python.org/mailman/listinfo/python-list
surprised by import in python 2.6
Hello list, Recently someone asked me this question, to which I could not give an answer. I'm hoping for some insight, or a manual page. What follows is python 2.6. The problem is with the difference between from test import * and import test First things first. Here's the code to test.py: a = 3 def f(): global a return a Now, in the interactive interpreter: >>> from test import * >>> a 3 >>> f() 3 >>> a = 4 >>> f() 3 in a second session: >>> import test >>> test.a 3 >>> test.f() 3 >>> test.a = 4 >>> test.f() 4 Somehow, in the first session I cannot modify the global variable a returned from f, but in the second session I can. To my eye, the only difference seems to be a namespace. Can anyone shine some light on this matter? Thanks, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: Reactive programming in Python ?
You can find more information on this project at www.yoopf.org. Your comments are more than welcome! Is this something similar to trellis? http://pypi.python.org/pypi/Trellis -- http://mail.python.org/mailman/listinfo/python-list
Re: Only one forum app in Python?
Is Pocoo really the only solution available out there? No. See e.g. http://www.pyforum.org/ -- http://mail.python.org/mailman/listinfo/python-list
Re: can python make web applications?
Deep_Feelings wrote: can python make powerfull database web applications that can replace desktop database applications? e.g: entrprise accounting programs,enterprise human resource management programs ...etc In addition to the recommendations by other people, I'd like to recommend the very easy to learn and use web2py. (www.web2py.com). -- http://mail.python.org/mailman/listinfo/python-list
Re: Spreadsheet-style dependency tracking
Florian Weimer wrote: Are there libraries which implement some form of spreadsheet-style dependency tracking? The first that come to mind (I have very limited experience with them): trellis http://peak.telecommunity.com/DevCenter/Trellis pycells http://pycells.pdxcb.net/ Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
