Re: Bounds checking
What sort of checks are you making ? - in general greater than/less than
tend to be fairly optimal, although you might be able to do a faster is
negative test
Katie
On Fri, Mar 18, 2011 at 2:24 PM, Martin De Kauwe mdeka...@gmail.com wrote:
Hi,
if one has a set of values which should never step outside certain
bounds (for example if the values were negative then they wouldn't be
physically meaningful) is there a nice way to bounds check? I
potentially have 10 or so values I would like to check at the end of
each iteration. However as the loop is over many years I figured I
probably want to be as optimal as possible with my check. Any
thoughts?
e.g. this is my solution
# module contain data
# e.g. print state.something might produce 4.0
import state as state
def main():
for i in xrange(num_days):
# do stuff
# bounds check at end of iteration
bounds_check(state)
def bounds_check(state):
check state values are 0
for attr in dir(state):
if not attr.startswith('__') and getattr(state, attr) 0.0:
print Error state values 0: %s % (attr)
sys.exit()
if __name__ == __main__:
sys.exit(main())
thanks
Martin
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Re: Bounds checking
On Fri, Mar 18, 2011 at 3:01 PM, Jean-Michel Pichavant jeanmic...@sequans.com wrote: Don't check for bounds, fix any bug in the code that would set your values out of bounds and use asserts while debugging. Otherwise if you really need dynamic checks, it will cost you cpu, for sure. Howeverver you could for instance override the __setatttr__ of state object, and call the attribute's associated function. If the codes something critical (i.e. it's used for financial calculations, hardware control, etc.) it's probably safer to test it dynamically, unless you only have a finite number of inputs/outputs it's often hard to ensure you've fixed all the bugs. Katie -- CoderStack h http://www.coderstack.co.ukttp://www.coderstack.co.uk/perl-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: possible to run a python script without installing python?
On Tue, Mar 15, 2011 at 8:58 PM, davidj411 davidj...@gmail.com wrote: it seems that if I copy the python.exe binary and the folders associated with it to a server without python, i can run python. does anyone know which files are important to copy and which can be omitted? i know about py2exe and have had no luck with it. What's the reason for wanting to avoid installing Python? - are you just trying to save disk space? If it's a case of not having admin rights, you can just copy the Python directory, I don't believe it has any dependencies anywhere else. Katie -- CoderStack http://www.coderstack.co.uk The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Numerical representation
The main choices for arbitrary point precision seem to be mpmath (which is pure python) and GMP (C++ but with python wrapper; GMP is heavily used in academia) Links: http://code.google.com/p/mpmath/ http://gmpy.sourceforge.net/ Katie -- CoderStack http://www.coderstack.co.uk The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to gain root privileges
On Wed, Feb 16, 2011 at 9:26 PM, GSO gso...@yahoo.co.uk wrote: I'm sure this question is as old as time, but what is the best way to gain root privileges? (Am using Python 2.6.5, pygtk2 v2.16, Gtk v2.18.9, on RHEL6.) Running any kind of script sudo'd is a bad idea, it's very very hard (in many cases impossible) to do securely. Root permissions in general should only be used for what they're needed for and nothing else (that means getting the permission, doing the stuff that needs to be done as root, and then returning back to normal privs), anything else is just asking for trouble. Katine -- CoderStack http://www.coderstack.co.uk/php-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Developing a program to make a family tree.
On Fri, Jan 14, 2011 at 7:57 PM, Jon Clements jon...@googlemail.com wrote: Otherwise, you're in for a struggle, as you need to choose a storage back-end, a GUI (wxWindows/GTK/Qt4 etc...), how to handle GEDCOM format (unless it's not going to be compatible with other software), does it need to produce web pages/reports (and in what formats). There are a couple of Python gedcom parsers around: http://ilab.cs.byu.edu/cs460/code/gedcom/gedcom.py https://github.com/dijxtra/simplepyged Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Fitness data program
On Sat, Jan 15, 2011 at 5:47 PM, Antonio Cardenes antonio.carde...@gmail.com wrote: Hello folks, I'm trying to improve my Phyton skills with a project: A fitness program that can correlate measurements (weight and size of various body parts), date taken and it has to be able to print a nice graph showing improvements (a la Wii Fit) Scipy + Matplotlib should give you the tools to do correlation stats and graphing. Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Python use growing fast
On Mon, Jan 10, 2011 at 10:29 PM, John Nagle na...@animats.com wrote: On 1/10/2011 1:02 PM, MRAB wrote: On 10/01/2011 20:29, Dan Stromberg wrote: I invite folks to check out Tiobe's Language Popularity Rankings: http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html That's somehow derived from web searches, not from any real data source. Look how far down JavaScript is. Any measure is arbitrary and subject to biases, what methodology would you prefer ? Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On Sun, Jan 2, 2011 at 7:26 AM, azakai alonmozi...@gmail.com wrote: The idea is that by compiling CPython itself, all the features of the language are immediately present, and at the latest version, unlike writing a new implementation which takes time and tends to lag behind. As to why run it on the web, there could be various uses, for example it could allow a simple learning environment for Python, which since it's on the web can be entered immediately without any download (and would run even in places where Python normally can't, like say an iPad). It looks pretty neat ! - most solutions I've seen involve running Python in a sandbox environment on the server as opposed to on the client desktop. Katie -- CoderStack http://www.coderstack.co.uk/perl-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter: The good, the bad, and the ugly!
On Thu, Dec 30, 2010 at 12:15 AM, rantingrick rantingr...@gmail.com wrote: However i need to stress that my intention is towards a 100% Python GUI. Not a binding, not a wrapping (except for OS calls!) but a *real* Python GUI. The only thing that i know of at this point is pyGUI although there are probably others. Allowing the average Python programmer the ability to read OS specific calls written in Python would not only benefit their GUI knowledge, but also there knowledge of OS's in general. It's very hard to write a good gui framework, very very few people have managed to do it well. Microsoft, Sun and Google have all had the resources to hire very good developers and designers to dedicate to the task and still haven't managed to do it well. There's not the expertise or the investment in the Python community to build a strong Python GUI solution. From an educational viewpoint I see that there could be value in having a pure Python solution, but in terms of having a GUI solution that people will actually want to use in their apps, I'm dubious that it's achievable. Katie -- CoderStack http://www.coderstack.co.uk/perl-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter: The good, the bad, and the ugly!
On Wed, Dec 29, 2010 at 11:58 PM, rantingrick rantingr...@gmail.com wrote: Then and only then will Python be truly what GvR intended. I want everyone here to consider what i am proposing and offer some opinions because it is time for change. What's your opinion of the other gui toolkits with Python bindings like PyQt and PyGtk? Katie -- CoderStack http://www.coderstack.co.uk/perl-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Language Detection Library/Code
On Tue, Dec 28, 2010 at 12:42 AM, Shashwat Anand anand.shash...@gmail.com wrote: Regarding dictionary lookup+n-gram approach I didn't quite understand what you wanted to say. Run through trigram analysis first, if it identified multiple languages as being matches within the error margin then split the text into words, and look up each word in the respective dictionaries to get a second opinion. Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Language Detection Library/Code
On Mon, Dec 27, 2010 at 7:10 PM, Shashwat Anand anand.shash...@gmail.com wrote: Can anyone suggest a language detection library in python which works on a phrase of say 2-5 words. Generally such libraries work by bi/trigram frequency analysis, which means you're going to have a fairly high error rate with such small phrases. If you're only dealing with a handful of languages it may make more sense to combine an existing library with a simple dictionary lookup model to improve accuracy. Katie -- CoderStack http://www.coderstack.co.uk/perl-jobs-in-london The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Web App
On Wed, Dec 22, 2010 at 9:43 PM, Sean secr...@gmail.com wrote: Anybody know where I can find a Python Development Environment in the form of a web app for use with Chrome OS. I have been looking for a few days and all i have been able to find is some old discussions with python developers talking about they will want one for the OS to be a success with them. Your best bet is probably just to SSH to a *nix box and use something like vim or emacs. None of the web solutions are anywhere near acceptable. Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Average Salary Report
On Sat, Dec 25, 2010 at 11:38 AM, czarina08 rina...@gmail.com wrote: I'm doing a market research report on the average hourly rates for Python/Django developers. Any input on this? I do understand that it does depend on the location, amount of experience and skills. I'd like to hear what are the hourly rates within your area :-) Thanks! Sector and location have a much bigger impact than language/platform on salary (although obviously demand for different languages varies by sector and location as well). Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Help regarding pattern matching
On Wed, Dec 15, 2010 at 9:21 PM, jupiter anil.jupit...@gmail.com wrote: Hi People, I need some ideas on how to find pattern in random data series like stock chart. What I want is to be able to find Head Shoulder pattern in chart. Have a look at the references in: http://www.dpem.tuc.gr/fel/fm2009/Papers/Tsinaslanidis.pdf They cover a variety of algorithms for detecting such patterns. Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Help regarding pattern matching
On Thu, Dec 16, 2010 at 2:34 AM, Chris Rebert c...@rebertia.com wrote: On Wed, Dec 15, 2010 at 6:22 PM, Katie T ka...@coderstack.co.uk wrote: On Wed, Dec 15, 2010 at 9:21 PM, jupiter anil.jupit...@gmail.com wrote: Hi People, I need some ideas on how to find pattern in random data series like stock chart. What I want is to be able to find Head Shoulder pattern in chart. Have a look at the references in: http://www.dpem.tuc.gr/fel/fm2009/Papers/Tsinaslanidis.pdf http://uom-gr.academia.edu/ProdromosTsinaslanidis/Papers/281823/An_Examination_of_the_Head_and_Shoulders_Technical_Pattern_A_Support_of_the_Technical_Analysiss_Subjective_Nature Katie -- CoderStack http://www.coderstack.co.uk/python-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Python distribution recommendation?
On Sat, Dec 11, 2010 at 12:43 PM, Octavian Rasnita orasn...@gmail.com wrote: Hi, Is there a recommended Python distribution for Windows XP? Either will work, although the python.org one is the more popular and is likely the one used by most tutorials and beginners guides. The ActiveState one bundles PyQT if you want to build apps with GUIs using QT (although it's fairly trivial to install with the regular Python as well). Katie -- CoderStack http://www.coderstack.co.uk The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling FORTAN dll functions from Python
On Tue, Dec 7, 2010 at 11:11 AM, Alex van der Spek zd...@xs4all.nl wrote: Does anyone know how to call functions from FORTRAN dlls in Python? Is it even possible? I browsed the documentation for Python 2.6.1 and the Python/C API comes close to what I would like to do but it is strictly limited to C. Unfortunately the passing of arguments in C and FORTRAN is very different, not to mention the differences with strings where FORTRAN expects a hidden length argument. It could call the FORTRAN dll from C and call the C functions from Python but is that my only option? For reference: I am using Python 2.6.1 FORTRAN powerstation 4.0. It is not an option to translate the FORTRAN code to C (using f2c) as the source code is the official ASME version of calculating steam tables. I've done it before by creating C wrapper function and it was relatively painless, using C wrappers means that it's much easier to integrate into other languages as well if you need to do more integration down the line. Katie -- CoderStack http://www.coderstack.co.uk The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
