🌐 Mailman 3 June 2010 - Python-list - python.org

Re: Using Python for web applications
by Mithrandir June 30, 2010

June 30, 2010

Wyatt Schwartz <Wyattjs42(a)gmail.com> wrote in news:mailman.33.1277921551.1673.python-list@python.org: > Dear Python-List members, > > Sorry for asking such a simple (or possibly complicated) question, as > I am new to Python programming. Anyways, I have read online that many > popular websites use Python for some of their web-based applications > (for example, Reddit), and that lead me to wonder how is this done? > > Thanks in advance! > > - Wyatt > - Beginning Python Programmer For something more server side see: http://wiki.python.org/moin/WebFrameworks Some nice examples are at: http://wiki.python.org/moin/WebApplications Good luck! :) -- People should read more. https://secure.wikimedia.org/wikipedia/en/wiki/User:MithrandirAgain "All that is gold does not glitter, not all those who wander are lost; the old that is strong does not wither, deep roots are not reached by the frost. >From the ashes a fire shall be woken, a light from the shadows shall spring; renenwed shall be blade that was broken, the crownless again shall be king."

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Energy Saving Tips
by ... June 30, 2010

June 30, 2010

1. Reduce heater's room temperature For each extra degree (Celsius) of temperature, your heater will consume 7 to 11% more energy. Adjust it to 18degrees which is also better for your health. 2. Install a programmable thermostat You will be able to control the heater's temperature during specific hours every day. 3. Insulate your house Loss of heat is loss of energy. 4. Fix air leaks 5. Close the chimney of the fireplace when you don't use it It is designed to drive smoke (hot air) out of the house! 6. Get an energy audit to advice you about the necessary fixes and insulation 7. Install energy efficient windows 8. Install storm windows In cold climates they may save up to 50% of energy loss of your current windows during the winter. 9. Shade the windows properly A tent outside the window will prevent more solar energy to enter the house that a curtain. 10.Plant deciduous trees to shade your house. During the winter they will loose their leaves and allow sunlight penetrate the house. 11.Mount aluminum sheets behind your space heaters It will reflect the thermal energy in the room, not on the wall. 12.Put the refrigerator far from any heat sources 13.Don't overload the fridge 14.Don't put hot food in the fridge. It will drain energy for no reason. Leave it out until it gets to the room temperature before putting it in the fridge. 15.Tidy up your fridge Firstly, you will need less time with the door open until you find what you need. Secondly, the frost will be distributed better. 16.Keep your fridge clean You can save up to 30% of loss of energy by cleaning the dust from the back of your refrigerator. Also, clean it from the ice which reduces its performance. 17.Switch off the lights where you don't need them 18.Use CFLs Compact Fluorescent Light bulbs are way more economic. Save up to 70% of electricity costs for lighting. 19. Look for Energy Star qualified appliances 20.Use the “eco” mode to reduce your appliances electricity consumption 21.Don't use the air-conditioner with the windows open 22.Clean the air-conditioner's filters regularly 23.Shade your air-conditioner's compressors properly They will use 10% less energy. 24.Walk, walk, walk Walk to the supermarket, walk to the school, walk and save energy. 25.Drive slower to reduce emissions Aggressive driving consumes more fuel. 26.Don't pre-heat the car engine. Instead, you can drive at low velocities during the first minutes until the engine is properly heated. 27.Keep your car tires pressure at the proposed limits. This will save you fuels and it will make your car safer too. 28.Go Hybrid Hybrid cars produce less greenhouse gases. Check out the local funds and buy one at a better price OR 29.Buy an electric car 30.Use public means of transport 31.Buy proper cookware Make sure that your pans and the other kitchenware fix properly on the cooker. Otherwise you will loose energy for no reason. 32.Turn the cooker off before the food is finished It will remain hot for a little and the food will be cooked without wasting any energy. 33.Don't use a cloth dryer It consumes too much energy. Remember, sun can be a really good friend if used properly. 34.Wash your clothes on lower temperature Avoid energy loss when possible. 35.Don't leave electronics on stand-by mode They will not stop using electricity. Use a plug-board with a switch to completely switch off all appliances. 36.Say no to screen savers Turn the monitor off instead. 37.A plugged charger will consume energy even when it is not connected to the device 38.Go Local Avoid transportation to far away distances if you can do the same thing nearby. Choose a local supermarket, buy from the bakery of the neighborhood. Also prefer local products to reduce the CO2 emissions cause to their transportation. 39.Go On-line Make your bank or any other transactions using the Internet. This will save you time and transportation costs too. 40.Don't use the microwave oven to defrost food Instead, you can just leave it at room temperature for a little bit longer. 41.Go Passive Using the sun properly can save you lots of money. 42.Use solar water heaters They provide free hot water. 43.Maintain your water heater regularly Badly maintained heaters consume way more electricity. 44.Insulate your water pipes 45.Install a Green Roof It will save you lots of energy along with multiple other advantages it provides.

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Re: Why Is Escaping Data Considered So Magical?
by Carl Banks June 30, 2010

June 30, 2010

On Jun 30, 2:55 am, Cameron Simpson <c...(a)zip.com.au> wrote: > On 29Jun2010 21:49, Carl Banks <pavlovevide...(a)gmail.com> wrote: > | On Jun 28, 2:44 am, Gregory Ewing <greg.ew...(a)canterbury.ac.nz> wrote: > | > Carl Banks wrote: > | > > Indeed, strncpy does not copy that final NUL if it's at or beyond the > | > > nth element. Probably the most mind-bogglingly stupid thing about the > | > > standard C library, which has lots of mind-boggling stupidity. > | > > | > I don't think it was as stupid as that back when C was > | > designed. Every byte of memory was precious in those days, > | > and if you had, say, 10 bytes allocated for a string, you > | > wanted to be able to use all 10 of them for useful data. > | > > | > So the convention was that a NUL byte was used to mark > | > the end of the string *if it didn't fill all the available > | > space*. > | > | I can't think of any function in the standard library that observes > | that convention, which inclines me to disbelieve this convention ever > | really existed. If it did, there would be functions to support it. > | > | For that matter, I'm not really inclined to believe bytes were *that* > | precious in those days. > > Jeez. PDP-11s, 16 bit addressing, tiny tiny disc drives! > > The original V7 (and probably earlier) UNIX filesystem has 16 byte directory > entries: 2 bytes for an inode and 14 bytes for the name. You could use 14 > bytes of that name, and strncpy makes it effective to work with that data > structure. > > Shortening something already only 14 bytes (the name) _is_ a big ask, > and it is well work the unusual convention in play. You are talking about fixed-length memory records, not strings. I'm saying that bytes were not so precious that, when you operate on *actual strings*, that you need to desperately cut off nul terminators to save space. > | The obvious rationale behind strncpy's stupid behavior is that it's > | not a string function at all, but a memory block function, that stops > | at a NUL in case you don't care what's after the NUL in a block. But > | it leads you to believe it's a string function by it's name. > > Bah. It's for copying a _string_ into a _buffer_! Strangely, since it > starts with a string (NUL-terminated byte sequence) it begins with > "str". And it _is_ copying, but not into another string. I'm going to disagree. The input of strncpy can be either a string or a memory block, and the output can only a memory block. In other words, neither the source nor destination has to be a string. This is a memory block function, not a string function. The correct name for this function should have been memcpytonul. Even if you disagree, then you must admit it should have been called strcpytobuf. Nothing about the name strncpy gives the slightest suggestion that the destination is not a string. Based on analogy from other str functions, none of which have any sources or destinations that are memory blocks, one would logically expect that strncpy's destination was a string. It defies common sense. And there should have been an actual, correctly working strncpy in the standard library that copies and truncates actual strings. > It is special purpose but perfectly reasonable for the problem at hand. The usefulness of strncpy's behavior for writing fixed-length memory blocks is not in question here. The thing that's mind-bogglingly stupid is that the function that does this is called "strncpy". Carl Banks

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Using Python for web applications
by Wyatt Schwartz June 30, 2010

June 30, 2010

Dear Python-List members, Sorry for asking such a simple (or possibly complicated) question, as I am new to Python programming. Anyways, I have read online that many popular websites use Python for some of their web-based applications (for example, Reddit), and that lead me to wonder how is this done? Thanks in advance! - Wyatt - Beginning Python Programmer

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Writing & Editing Jobs
by Australia June 30, 2010

June 30, 2010

Hi, We are looking for some people that are interested in working from their home on a part or full-time basis. If you want to earn $100, $200 or even up to $500 a day, and you don't mind writing some short opinions up, this is the perfect opportunity for you! We work with hundreds of companies such as 20th Century Fox, Paramount Entertainment, Ford Motor Company, Google and more! We recruit people to fill 1000s of jobs for companies like this every year. Many of these jobs are simple online writing tasks, such as blogging about a movie that you recently saw, commenting on what your opinion is of a certain kind of car, proof reading simple documents and more! http://fyad.org/11352 These companies are fighting for exposure on the internet and know the more people blogging about them, means the more exposure they are going to get, and ultimately the more money they are going to make. There has been an explosion in the need for online writers, regardless of skill. These companies are more interested in your honest genuine opinions when you're writing blog entries about their company... not if you are a very talented writer. If you're looking for work, or just want to make some part time money on the side, please come check out the jobs we have available. We are currently accepting new members. http://fyad.org/11352 Sincerely, Lisa Roberts Director of HR

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Re: I strongly dislike Python 3
by Lie Ryan June 30, 2010

June 30, 2010

On 07/01/10 01:30, Stephen Hansen wrote: > On 6/30/10 5:52 AM, Lie Ryan wrote: >> On 06/27/10 11:24, Steven D'Aprano wrote: >>>>> Producing print function takes a little bit more effort than >>>>> producing a >>>>> print statement. >>> >>> (1) The main use-cases for print are quick (and usually dirty) scripts, >>> interactive use, and as a debugging aid. >> >> That is precisely how the quick-and-dirty syntax of print statement can >> be justified. While debugging, you'll need to be able to quickly add and >> delete prints here and there, and the extra parens can quickly become >> irritating. > > I want to stamp a [Citation Needed] claim on that :) That's based on my own anecdotal experience. > Considering all the other things you're likely to do during 'quick and > dirty' debugging, an extra set of parens seems terribly unlikely to > really be any kind of issue. You want to focus on doing these "other things you're likely to do" instead of having to do the function call keyboard dance. > That justification sounds like its based on a > mountain-out-of-a-mole-hill complaint: print() is really not that > significantly more difficult then the print statement. indeed it isn't a major irritant; but it *is* irritating.

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Re: numpy - save many arrays into a file object
by Peter Otten June 30, 2010

June 30, 2010

Laszlo Nagy wrote: > import numpy > data = numpy.array(...) > numpy.save("test.np",data) > > This is very good, but I want to save the data into a file object with a > write() method. E.g. not a real file. (My purpose right now is to save > many arrays into one binary file, while recording starting positions of > the arrays.) > > How can I do that? numpy.save() accepts file(-like) objects, the help is quite clear about that: """ save(file, arr) Save an array to a binary file in NumPy format. Parameters ---------- f : file or string File or filename to which the data is saved. If the filename does not already have a ``.npy`` extension, it is added. x : array_like Array data. """ >>> import numpy >>> from StringIO import StringIO >>> stream = StringIO() >>> a = numpy.array([1,2,3]) >>> b = numpy.array([10, 11]) >>> numpy.save(stream, a) >>> pos = stream.tell() >>> numpy.save(stream, b) >>> stream.seek(0) >>> stream.seek(pos) >>> numpy.load(stream) array([10, 11]) >>> stream.seek(0) >>> numpy.load(stream) array([1, 2, 3]) Peter

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Re: dynamically modify help text
by aahz＠pythoncraft.com June 30, 2010

June 30, 2010

In article <mailman.2338.1277812368.32709.python-list(a)python.org>, Thomas Jollans <thomas(a)jollans.com> wrote: > >% python2.6 >Python 2.6.5+ (release26-maint, Jun 28 2010, 19:46:36) >[GCC 4.4.4] on linux2 >Type "help", "copyright", "credits" or "license" for more information. >>>> class OLD: pass >... >>>> class NEW(object): pass >... >>>> OLD.__doc__ = "foo" >>>> NEW.__doc__ = "bar" >Traceback (most recent call last): > File "<stdin>", line 1, in <module> >AttributeError: attribute '__doc__' of 'type' objects is not writable >>>> I'd argue that's a bug -- feel free to file one. I think this might even be fixable in 2.7.1. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ "If you don't know what your program is supposed to do, you'd better not start writing it." --Dijkstra

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numpy - save many arrays into a file object
by Laszlo Nagy June 30, 2010

June 30, 2010

import numpy data = numpy.array(...) numpy.save("test.np",data) This is very good, but I want to save the data into a file object with a write() method. E.g. not a real file. (My purpose right now is to save many arrays into one binary file, while recording starting positions of the arrays.) How can I do that? Thanks Laszlo

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Re: git JSONRPC web service and matching pyjamas front-end
by CM June 30, 2010

June 30, 2010

On Jun 29, 6:54 pm, Luke Kenneth Casson Leighton <l...(a)lkcl.net> wrote: > as more than just a proof-of-concept but to get pyjamas out of looking > like "a nice toy, doesn't do much, great demos, shame about real > life", i've created yet another git repository browser. this one, > thanks to pyjamas, obviously runs as both a desktop application and > also as a web application - same source code. > > pyjamasgitweb is actually two independent happily small projects. the > first is simply a JSONRPC-based git web server (in python, using > python-git) and the second is a matching front-end. > > the front-end is happily bare but functional. a demo is here (please > be nice to it) where you will see immediately a total lack of colour > or even borders:http://pyjs.org/pygit When I load that page all I see is what appears to be the barest of a web page with some text and links, but no widgets. If may be generated with pyjamas but I'm not sure how this fulfills your wish to do something that does more than "doesn't do much". I would expect a demo to at least have some typical GUI features on it--or am I completely missing the point of what you're doing? Che

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