🌐 Mailman 3 December 2014 - Python-list - python.org

learning to use iterators
by Seb Dec. 27, 2014

Dec. 27, 2014

Hi, I'm fairly new to Python, and while trying to implement a custom sliding window operation for a pandas Series, I came across a great piece of code¹: >>> def n_grams(a, n): ... z = (islice(a, i, None) for i in range(n)) ... return zip(*z) ... I'm impressed at how succinctly this islice helps to build a list of tuples with indices for all the required windows. However, I'm not quite following what goes on in the first line of the function. Particulary, what do the parentheses do there? Thanks, +--- Footnotes ---+ ¹ http://sahandsaba.com/thirty-python-language-features-and-tricks-you-may-no… -- Seb

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Re: Future of python on android
by iMath Dec. 26, 2014

Dec. 26, 2014

在 2014年12月25日星期四UTC+8下午11时31分24秒，Fetchinson .写道： > Hi all, > > I was using sl4a for quite some time on android and it basically > worked very well although some features are missing. It looks like > sl4a is dead, although I could be wrong. Does anyone knowledgeable > have any further info on the future of sl4a? For instance it doesn't > work with android 5 and there doesn't seem to be any activity around > it for the past couple of years. > > If sl4a is out, what's the preferred way of running python on android? > Guido is still working at google, right? This makes me suspect that > python is ought to be part of the android ecosystem but can't find > anything else beyond sl4a. > > So what's the future proof way of writing/deploying/installing python > programs on android? > > Cheers, > Daniel > > > -- > Psss, psss, put it down! - http://www.cafepress.com/putitdown According this post here, http://plashless.wordpress.com/2014/08/19/using-pyqtdeploy0-5-on-linux-to-c… you can use PyQt5 for Android app development !

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ANN: PyQt v5.4 Released
by Phil Thompson Dec. 26, 2014

Dec. 26, 2014

PyQt5 v5.4 has been released and is available from http://www.riverbankcomputing.com/software/pyqt/download5. PyQt5 is a comprehensive set of bindings for v5 of Digia's Qt cross-platform application framework. It supports Python v3, v2.7 and v2.6. The highlights of this release include support for Qt v5.4 including the new QtWebChannel and QtWebEngineWidgets modules. The QtXml module has also been restored. PyQt5 supports cross-compiling to iOS and Android. Windows installers are provided which contain everything needed for PyQt5 development (including Qt, Qt Designer, QScintilla, and MySQL, PostgreSQL, SQLite and ODBC drivers) except Python itself. Installers are provided for the 32 and 64 bit versions of Python v3.4. PyQt5 is implemented as a set of 33 extension modules including support for: - non-GUI infrastructure including event loops, threads, i18n, user and application settings, mapped files and shared memory - GUI infrastructure including window system integration, event handling, 2D graphics, basic imaging, fonts, OpenGL - a comprehensive set of desktop widgets - WebKit and Chromium based browsers - WebSockets - a client-side library for accessing Qt Cloud Services - full integration with Quick2 and QML allowing new Quick items to be implemented in Python and created in QML - event driven network programming - multimedia including cameras, audio and radios - Bluetooth - global positioning using satellite, Wi-Fi or text file sources - sensors including accelerometers, altimeters, compasses, gyroscopes, magnetometers, and light, pressure, proximity, rotation and temperature sensors - serial ports - SQL - printing - DBus - XPath, XQuery, XSLT and XML Schema validation - a help system for creating and viewing searchable documentation - unit testing of GUI applications.

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Re: Future of python on android
by Steven D'Aprano Dec. 26, 2014

Dec. 26, 2014

Fetchinson . wrote: > Guido is still working at google, right? No. Google is still using Python for lots of things, but Guido is now working for Dropbox. https://www.python.org/~guido/ -- Steven

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OFF TOPIC Snow Crash [was Re: Hello World]
by Steven D'Aprano Dec. 26, 2014

Dec. 26, 2014

Chris Angelico wrote: > On Tue, Dec 23, 2014 at 12:15 AM, Roy Smith <roy(a)panix.com> wrote: >> If I really didn't trust something, I'd go to AWS and spin up one of >> their free-tier micro instances and run it there :-) > > How do you know it won't create console output that stroboscopically > infects you with a virus through your eyes? Because that's *totally* > what would be done in the town of Eureka. Anybody in IT who hasn't read Neal Stephenson's "Snow Crash" needs to hand in their Geek Card immediately. "Snow Crash" is nearly 20 years old now but still as much of a ripping yarn today as it was the year it was written. Under-achiever, freelance hacker and part-time pizza delivery boy for the Mafia, Hiro Protagonist, discovers that somebody has written a virus that hacks into computer programmers' brains via their optic nerve. This book has drama, adventure, humour, vast amounts of exposition that might even be almost true, a murderous Inuit who is his own sovereign state (a *nuclear armed* sovereign state at that), Rat Things, Sumerian myths, Reverend Wayne's Pearly Gates franchise, one of the most spunky teenage protagonists I've ever read, and pirates listening to Reason. -- Steven

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very weird pandas behavior
by ryguy7272 Dec. 26, 2014

Dec. 26, 2014

I downloaded pandas and put it in my python directory, then, at the C-prompt, I ran this: "pip install pandas" It looks like everything downloaded and installed fine. Great. Now, in Python Shell, I enter this: import pandas as pd I get this error. Traceback (most recent call last): File "<pyshell#19>", line 1, in <module> import pandas as pd ImportError: No module named pandas Any idea what I'm doing wrong?

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suggestions for VIN parsing
by Vincent Davis Dec. 26, 2014

Dec. 26, 2014

I would like to parse the VIN, frame and engine numbers found on this page (below). I don't really know any regex, I have looked a little at pyparsing. I have some other similar numbers to. I am looking for suggestions, which "tool" should I learn, how should I approach this. http://www.britishspares.com/41.php Thanks Vincent

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Re: Classes - "delegation" question.
by Steven D'Aprano Dec. 26, 2014

Dec. 26, 2014

dieter wrote: > "Ivan Evstegneev" <webmailgroups(a)gmail.com> writes: >> I have a question about "delegation" coding pattern(I'm working with >> Python 3.4). > > Unlike Java, Python supports "multiple inheritance". This means > that you need "delegation" much more rarely in Python. > Python does not have much special support for delegation: usually, > you must delegate explicitely - maybe using a delagating decorator. You might *need* delegation more rarely, but some people believe that delegation and composition is a better design pattern than inheritance: http://learnpythonthehardway.org/book/ex44.html http://en.wikipedia.org/wiki/Composition_over_inheritance#Benefits http://joostdevblog.blogspot.com.au/2014/07/why-composition-is-often-better… http://stackoverflow.com/questions/2068158/why-does-cocoa-use-delegates-rat… However, be warned that there are two subtly different models for delegation. Here's the one that people seem to forget: http://code.activestate.com/recipes/519639-true-lieberman-style-delegation-… -- Steven

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If One Line
by JC Dec. 26, 2014

Dec. 26, 2014

Hello, Is it possible in python: if ((x = a(b,c)) == 'TRUE'): print x Thanks.

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Re: what is wrong with d.clear()?
by Rustom Mody Dec. 26, 2014

Dec. 26, 2014

On Tuesday, December 23, 2014 6:30:30 PM UTC+5:30, shawool wrote: > Thank you for answering my query. > > Fonts and colors are reset to defaults now. Sorry for the inconvenience caused. > > Regards, > Shawool Sorry for the peevishness Are you using gmail? If so when you compose a message The compose window has little downward triangle In there there is a 'plain text' option You need to use that [I just use google groups]

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