🌐 Mailman 3 October 2013 - Python-list - python.org

converting a string to a function parameter
by koranthala Jan. 5, 2014

Jan. 5, 2014

Hi, Is it possible to convert a string to a function parameter? Ex: str = 'True, type=rect, sizes=[3, 4]' and I should be able to use it as: test(convert(str)) and the behaviour should be same as calling test with those values : i.e. test(True, type=rect, sizes=[3, 4]) I tried eval, but it did not work. And any other mechanism I think turns out to be creating a full fledged python parser. Is there any mechanism with which we can do this straight away?

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Python for IPSA (Power flow analysis)
by Debbie Dec. 15, 2013

Dec. 15, 2013

Hi there, I am new to Python, and wondering if you could help me with python based coding for the IPSA (Power system analysis software). I have a electrical distribution network with generators, buses and loads, on which I am performing the load flow analysis every 1 hour for a period of 1 year. The code to perform instantaneous load/power flow analysis is given below. I need to modify it such that I can perform this load flow analysis every 1 hour for a period of 1 year. Please help. from ipsa import * ipsasys = IscInterface() net = ipsasys.ReadFile("refinery.iif") bok = net.DoLoadFlow(); if bok: busbars = net.GetBusbars() print "Load Flow results:" print "" print "BusName Vmag(kV)" print "====================" for bus in busbars.itervalues(): name = bus.GetName() vm = bus.GetVoltageMagnitudekV() res = "%-8s %10.5f" % (name, vm) print res else: print "Load Flow failed!" Regards, Debbie

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PEP 450 Adding a statistics module to Python
by Steven D'Aprano Dec. 10, 2013

Dec. 10, 2013

I am seeking comments on PEP 450, Adding a statistics module to Python's standard library: http://www.python.org/dev/peps/pep-0450/ Please read the FAQs before asking anything :-) Also relevant: http://bugs.python.org/issue18606 -- Steven

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Problem when applying Patch from issue1424152 to get https over authenticating proxies working with urllib2 in Python 2.5
by tvashtar Dec. 10, 2013

Dec. 10, 2013

Hi, I'm trying to get https requests working through an authenticating proxy with urllib2 in Python 2.5, I'm aware that this isn't supported "out of the box", so applied the patch http://bugs.python.org/file9753/http-tunnel-urllib linked from http://bugs.python.org/issue1424152 , my baseline test program is the following: p = "user:pass@proxy:port" proxy_handler = urllib2.ProxyHandler({"http": p, "https": p}) urllib2.install_opener( urllib2.build_opener( urllib2.HTTPHandler, urllib2.HTTPSHandler, proxy_handler)) request = urllib2.Request( "https://groups.google.com") response = urllib2.urlopen(request) Unfortunately this doesn't work, the call stack being: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "D:\p4\depot\Development\HEAD\Build\ReleaseSystem\DownloadSystem \urllib2.py", line 121, in urlopen return _opener.open(url, data) File "D:\p4\depot\Development\HEAD\Build\ReleaseSystem\DownloadSystem \urllib2.py", line 374, in open response = self._open(req, data) File "D:\p4\depot\Development\HEAD\Build\ReleaseSystem\DownloadSystem \urllib2.py", line 392, in _open '_open', req) File "D:\p4\depot\Development\HEAD\Build\ReleaseSystem\DownloadSystem \urllib2.py", line 353, in _call_chain result = func(*args) File "D:\p4\depot\Development\HEAD\Build\ReleaseSystem\DownloadSystem \urllib2.py", line 1108, in https_open return self.do_open(httplib.HTTPSConnection, req) File "D:\p4\depot\Development\HEAD\Build\ReleaseSystem\DownloadSystem \urllib2.py", line 1075, in do_open raise URLError(err) urllib2.URLError: <urlopen error (1, 'error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol')> Does anyone know why I might be hitting this issue? Any help is greatly appreciated, thanks

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status of regex modules
by Mark Lawrence Dec. 5, 2013

Dec. 5, 2013

The new module is now five years old. PEP 429 Python 3.4 release schedule has it listed under "Other proposed large-scale changes" but I don't believe this is actually happening. Lots of issues on the bug tracker have been closed as fixed in the new module, see issue 2636 for more data. Some work is still being carried out on the old re module. So where do we stand? Is the new module getting into Python 3.x, Python 4.y or what? If no do all the old issues have to be reopened and applied to the re module? Who has to make the final decision on all of this? Note that I've no direct interest as I rarely if ever use the little perishers, I just find this situation bizarre. -- Python is the second best programming language in the world. But the best has yet to be invented. Christian Tismer Mark Lawrence

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Re: Finding keywords
by Cross Dec. 5, 2013

Dec. 5, 2013

On 03/09/2011 01:21 AM, Vlastimil Brom wrote: > 2011/3/8 Cross<X(a)x.tv>: >> On 03/08/2011 06:09 PM, Heather Brown wrote: >>> >>> The keywords are an attribute in a tag called<meta>, in the section >>> called >>> <head>. Are you having trouble parsing the xhtml to that point? >>> >>> Be more specific in your question, and somebody is likely to chime in. >>> Although >>> I'm not the one, if it's a question of parsing the xhtml. >>> >>> DaveA >> >> I know meta tags contain keywords but they are not always reliable. I can >> parse xhtml to obtain keywords from meta tags; but how do I verify them. To >> obtain reliable keywords, I have to parse the plain text obtained from the >> URL. >> >> Cross >> >> --- news://freenews.netfront.net/ - complaints: news(a)netfront.net --- >> -- >> http://mail.python.org/mailman/listinfo/python-list >> > > Hi, > if you need to extract meaningful keywords in terms of data mining > using natural language processing, it might become quite a complex > task, depending on the requirements; the NLTK toolkit may help with > some approaches [ http://www.nltk.org/ ]. > One possibility would be to filter out more frequent and less > meaningful words ("stopwords") and extract the more frequent words > from the reminder., e.g. (with some simplifications/hacks in the > interactive mode): > >>>> import re, urllib2, nltk >>>> page_src = urllib2.urlopen("http://www.python.org/doc/essays/foreword/").read().decode("utf-8") >>>> page_plain = nltk.clean_html(page_src).lower() >>>> txt_filtered = nltk.Text((word for word in re.findall(r"(?u)\w+", page_plain) if word not in set(nltk.corpus.stopwords.words("english")))) >>>> frequency_dist = nltk.FreqDist(txt_filtered) >>>> [(word, freq) for (word, freq) in frequency_dist.items() if freq> 2] > [(u'python', 39), (u'abc', 11), (u'code', 10), (u'c', 7), > (u'language', 7), (u'programming', 7), (u'unix', 7), (u'foreword', 5), > (u'new', 5), (u'would', 5), (u'1st', 4), (u'book', 4), (u'ed', 4), > (u'features', 4), (u'many', 4), (u'one', 4), (u'programmer', 4), > (u'time', 4), (u'use', 4), (u'community', 3), (u'documentation', 3), > (u'early', 3), (u'enough', 3), (u'even', 3), (u'first', 3), (u'help', > 3), (u'indentation', 3), (u'instance', 3), (u'less', 3), (u'like', 3), > (u'makes', 3), (u'personal', 3), (u'programmers', 3), (u'readability', > 3), (u'readable', 3), (u'write', 3)] >>>> > > Another possibility would be to extract parts of speech (e.g. nouns, > adjective, verbs) using e.g. nltk.pos_tag(input_txt) etc.; > for more convoluted html code e.g. BeautifulSoup might be used and > there are likely many other options. > > hth, > vbr I had considered nltk. That is why I said that straightforward frequency calculation of words would be naive. I have to look into this BeautifulSoup thing. --- news://freenews.netfront.net/ - complaints: news(a)netfront.net ---

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Share Code: Laptop Lid State
by Devyn Collier Johnson Dec. 5, 2013

Dec. 5, 2013

Aloha everyone! I attached a script that I thought I could share with everyone for your help. This Python3 script only works on Unix systems. It prints the current state of the lid. This can be used to make a script that performs some action when the lid is closed or open. The script is licensed under LGPLv3 and I will soon upload it to my Launchpad account. Enjoy! Mahalo, DevynCJohnson(a)Gmail.com

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Sine wave?
by EC Nov. 25, 2013

Nov. 25, 2013

Ive been banging my head against the wall for the past few days trying to generate a sine wave... My math skills arent the best, I'll admit, and I think I'm going crosseyed trying to understand this... I *think* the following code should work but it outputs some really weird stuff. I'm sorta new so please help if you can! Thank you Eric #------------------------------------------- import math import wave import string pi = math.pi sin = math.sin cos = math.cos #init output and related vars sr = 44100 Outfile = wave.open("outfile.wav", "w") Outfile.setnchannels(1) Outfile.setsampwidth(4) Outfile.setframerate(sr) Outfile.setcomptype("NONE", "Uncompressed") Outtemp = [] Outstr = "" def get_phase(curphs, freq): phinc = (freq*1.0000/sr*1.0000)*360 phase = curphs + phinc if phase >= 360: phase -= 360 elif phase < 0: phase += 360 return phase def gen_wav(sec, freq, ampcent): numsamp = sec*sr amp = (ampcent*1.0000/100)*32767 i = 0 temp = [] t = 0 curphase = 0 while i < numsamp: curphase = get_phase(curphase, freq) t = int(round(amp*sin(2*pi*curphase))) temp.append(t) i+=1 return temp Outtemp = gen_wav(.01, 440, 75) Outstr = string.join(map(str, Outtemp), ",") print Outstr Outfile.writeframes(Outstr) Outfile.close()

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Dvalve! we called the heart of outsourcing world.
by Dvalve.com Nov. 22, 2013

Nov. 22, 2013

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Python Front-end to GCC
by Philip Herron Nov. 15, 2013

Nov. 15, 2013

Hey, I've been working on GCCPY since roughly november 2009 at least in its concept. It was announced as a Gsoc 2010 project and also a Gsoc 2011 project. I was mentored by Ian Taylor who has been an extremely big influence on my software development carrer. Gccpy is an Ahead of time implementation of Python ontop of GCC. So it works as you would expect with a traditional compiler such as GCC to compile C code. Or G++ to compile C++ etc. Whats interesting and deserves a significant mention is my work is heavily inspired by Paul Biggar's phd thesis on optimizing dynamic languages and his work on PHC a ahead of time php compiler. I've had so many ups and down in this project and i need to thank Andi Hellmund for his contributions to the project. http://paulbiggar.com/research/#phd-dissertation The project has taken so many years as an in my spare time project to get to this point. I for example its taken me so long simply to understand a stabilise the core fundamentals for the compiler and how it could all work. The release can be found here. I will probably rename the tag to the milestone (lucy) later on. https://github.com/redbrain/gccpy/releases/tag/v0.1-24 (Lucy is our dog btw, German Shepard (6 years young) loves to lick your face off :) ) Documentation can be found http://gcc.gnu.org/wiki/PythonFrontEnd. (Although this is sparse partialy on purpose since i do not wan't people thinking this is by any means ready to compile real python applications) I've found some good success with this project in compiling python though its largely unknown to the world simply because i am nervous of the compiler and more specifically the python compiler world. But at least to me there is at least to me an un-answered question in current compiler implementations. AOT vs Jit. Is a jit implementation of a language (not just python) better than traditional ahead of time compilation. What i can say is ahead of time at least strips out the crap needed for the users code to be run. As in people are forgetting the basics of how a computer works in my opinion when it comes to making code run faster. Simply need to reduce the number of instructions that need to be executed in order to preform what needs to be done. Its not about Jit and bla bla keyword llvm keyword instruction scheduling keyword bla. I could go into the arguments but i feel i should let the project speak for itself its very immature so you really cant compare it to anything like it but it does compile little bits and bobs fairly well but there is much more work needed. There is nothing at steak, its simply an idea provoked from a great phd thesis and i want to see how it would work out. I don't get funded of paid. I love working on compilers and languages but i don't have a day job doing it so its my little pet to open source i believe its at least worth some research. I would really like to hear the feedback good and bad. I can't describe how much work i've put into this and how much persistence I've had to have in light of recent reddit threads talking about my project. I have so many people to thank to get to this point! Namely Ian Taylor, Paul Biggar, Andi Hellmund, Cyril Roelandt Robert Bradshaw, PyBelfast, and the Linux Outlaws community. I really couldn't have got to this point in my life without the help of these people! Thanks! --Phil

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