🌐 Mailman 3 July 2018 - Python-list - python.org

Re: Checking whether type is None
by Stephan Houben July 27, 2018

July 27, 2018

Op 2018-07-25, Ian Kelly schreef <ian.g.kelly(a)gmail.com>: > Is there a reason for using singledispatch here rather than a simpler and > more readable "if color is None" check? Yes, the other 20 cases I didn't show. And extensibility. Stephan

2 1

Anyone using cloud based monitoring/logging services with Python logging module?
by Malcolm Greene July 27, 2018

July 27, 2018

Looking for feedback on anyone who's using a cloud based monitoring/logging service with Python's standard lib logging module, eg. services such as Datadog, Loggly, Papertrailapp, Scalyr, LogDNA, Logz.io, Logentries, Loggr, Logstats? Would appreciate hearing your experience, pros, cons, recommendations, etc. Thanks! Malcolm

3 2

[ANN] aioxmpp 0.10 released
by Jonas Wielicki July 26, 2018

July 26, 2018

Dear subscribers, We are pleased to announce the release of aioxmpp 0.10. The current release can be obtained from GitHub [1] (check out the v0.10.0 tag) or PyPI [2]. The HTML documentation can be found at [3]. Examples can be found in the GitHub repository, in the examples sub directory. aioxmpp is a Python library based on asyncio. It implements the client side of the XMPP protocol (RFC 6120 and others). For a more detailed description of the package, please review the README of the package on GitHub [1] or on PyPI [2]. For more information on XMPP, please see [8]. aioxmpp is licensed under the terms of the GNU Lesser General Public License Version 3.0 or later. Version 0.10 is a feature release. * Support for XEP-0077 (In-Band Registration) was contributed by Sergio Alemany [@gersiete]. * Support for requesting an HTTP upload slot via XEP-0363 (HTTP Upload) and support for requesting and replying to XEP-0092 (Software Version) requests. Aside from these newly supported XEPs, much of the work has been on plumbing. Some of the highlights include: * New timeout logic which should help on links with high latency * Enumification of Stanza and Stream Error Conditions * Streamlinging of the aioxmpp.im interfaces and support for MUC invitations. The full list of new features is, as always, included in the changelog [9] included in the official documentation. Bugs, feature requests, patches and questions can be directed to either the aioxmpp mailing list [4], the GitHub issue tracker [5] or the XMPP Multi-User chat [6], whatever floats your boat. Please direct security-relevant issue reports directly to me (jonas(a)wielicki.name), preferably encrypted using my GPG public key [7]. best regards and happy-asyncio-ing, The aioxmpp team [1]: https://github.com/horazont/aioxmpp [2]: https://pypi.python.org/pypi/aioxmpp [3]: https://docs.zombofant.net/aioxmpp/0.10/ [4]: https://lists.zombofant.net/mailman/listinfo/aioxmpp-devel [5]: https://github.com/horazont/aioxmpp/issues [6]: aioxmpp(a)conference.zombofant.net [7]: https://sks-keyservers.net/pks/lookup?op=get&search=0xE5EDE5AC679E300F AA5A 78FF 508D 8CF4 F355 F682 E5ED E5AC 679E 300F [8]: https://xmpp.org/ [9]: https://docs.zombofant.net/aioxmpp/0.10/api/ changelog.html#version-0-10 @gersiete: https://github.com/Gersiete

1 0

Python back-end architecture for android application
by praveenkumar beedanal July 26, 2018

July 26, 2018

Hello all, I am new to python language. I am planning to create android application, whose back end will be Python. The work of the android application is to visualize the co2 emission information and production quantity of the each resource plants. I have confusion regarding the back end architecture which will provide co2 and production quantity information for every 15 minutes. Here is the architecture what i am thinking, give me your feedback if anything wrong. First i am deploying the python application (Written in Django framework) in the server, in application i will provide the required parameters to fetch the data from the ENTSOE API, which provide response in XML that i will parse for the required data. The request has to sent by the application for every 15 minutes.Then application store the parsed data in the relational database. I am creating the web service(Django rest framework) to make connection between android application and data base. Once android application sent the request to the web service running in different server sends the request to the database to fetch required data. Web service sends the JSON response to the android app which will display the result. https://ibb.co/fdYboo here you find my architecture to better understandings. Thanks in advance

1 0

Re: Checking whether type is None
by Marko Rauhamaa July 26, 2018

July 26, 2018

Steven D'Aprano <steve+comp.lang.python(a)pearwood.info>: > On Wed, 25 Jul 2018 16:14:18 +0000, Schachner, Joseph wrote: >> thing is None looks just as odd to me. Why not thing == None ? That >> works. > > It is wrong (in other words, it doesn't work) because it allows > non-None objects to masquerade as None and pretend to be what they are > not. > > If that's your intent, then of course you may do so. But without a > comment explaining your intent, don't be surprised if more experienced > Python programmers correct your "mistake". Also, while thing == None would work perfectly in almost all cases in practice, it's unidiomatic and suggests the writer isn't quite comfortable with the workings of the language. Somewhat similarly, this code works perfectly: while (x > 0): y = y * x x = x - 1 # end of while return(y) but it doesn't look like Python. Marko

1 0

Re: Cookies not showing up in environ
by abc abc July 26, 2018

July 26, 2018

Well, I'm so messed up between so many sources and tutorials I don't know which way is up. References to environ variable: https://www.python.org/dev/peps/pep-0333/ https://stackoverflow.com/questions/16774952/wsgi-whats-the-purpose-of-star… I read that I have to have a file project/project/wsgi.py that has a function called 'application' that gets called; still a little fuzzy on whose calling it and passing these parameters. I understood that the cookies should be in HTTP_COOKIES inside the environ hash... they're not. From wsgi.py I call a function in my view which returns a response object. Sorry if my parameters don't quite match up, I've been rearranging things while trying to get this to work; it should just be environ and start_response in wsgi:application(). If I try to access the request object, it is None, and I'm not sure how I would get it if it's not coming form wsgi.py:application... My previous example is bad since they are passing 'status' to the start_response which I don't know how got created. TBH: I've spent days and days on this in different forums and am not getting much help or progress. I think I have made some sort of bad assumption in the beginning which is blocking me now. I don't normally like to ask for handouts, but can you please point me to a dead simple setup with wsgi.py and view.py that can handle cookies... just simply setting them and reading them?

2 5

Checking whether type is None
by Tobiah July 26, 2018

July 26, 2018

Consider: >>> type({}) is dict True >>> type(3) is int True >>> type(None) is None False Obvious I guess, since the type object is not None. So what would I compare type(None) to? >>> type(None) <type 'NoneType'> >>> type(None) is NoneType Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'NoneType' is not defined I know I ask whether: >>> thing is None but I wanted a generic test. I'm trying to get away from things like: >>> type(thing) is type(None) because of something I read somewhere preferring my original test method. Thanks

6 7

Can pip install packages for all users (on a Linux system)?
by John Ladasky July 26, 2018

July 26, 2018

I've been using "sudo pip3 install" to add packages from the PyPI repository. I have multiple user accounts on the computer in question. My goal is to install packages that are accessible to all user accounts. I know that using the Synaptic Package Manager in Ubuntu will install for all users, but not every Python package is included in the Canonical repository. I hadn't noticed any discrepancies until recently. I upgraded from Ubuntu 17.10 to 18.04. In parallel, I upgraded tensorflow-gpu 1.4.0 to 1.8.0. Everything worked on my main account. However, attempting to import tensorflow from Python on a secondary account failed. Eventually I checked the pip lists in each account, and I found a reference to the old tensorflow 1.4 on the secondary account. Uninstalling that, and reinstalling tensorflow-gpu 1.8 on the secondary account fixed the problem. I believe that I now have tensorflow 1.8 installed twice on my system, once for each user. If anyone can share how to convince pip to behave like Synaptic, I would appreciate it. Thanks.

3 3

Re: curses, ncurses or something else
by Peter Pearson July 25, 2018

July 25, 2018

On Mon, 23 Jul 2018 23:24:18 +0100, John Pote wrote: > I recently wrote a command line app to take a stream of numbers, do some > signal processing on them and display the results on the console. There > may be several output columns of data so a title line is printed first. > But the stream of numbers may be several hundred long and the title line > disappears of the top on the console. > > So I thought it might be quick and easy to do something with curses to > keep the title line visable while the numbers roll up the screen. But > alas I'm a Windows user and the 'curses' module is not in the Windows > standard library for Python. > > It occured to me that I could create a simple tkinter class but I > haven't tinkered for some time and would have to refresh my knowledge of > the API. Just wondered if there was any other simple way I could keep > the title line on the console, preferably without having to install > another library. Browsergui is designed to simplify GUI-building by mooching off your web browser. I like it. sudo pip3 install browsergui python3 -m browsergui.examples Enjoy! -- To email me, substitute nowhere->runbox, invalid->com.

2 1

Re: Checking whether type is None
by Stephan Houben July 25, 2018

July 25, 2018

Op 2018-07-24, Chris Angelico schreef <rosuav(a)gmail.com>: > On Wed, Jul 25, 2018 at 9:18 AM, Rob Gaddi ><rgaddi(a)highlandtechnology.invalid> wrote: >> On 07/24/2018 01:07 PM, Chris Angelico wrote: >> I suppose one valid usage would be this sort of thing: >> >> fn = { >> int: dispatchInt, >> str: dispatchStr, >> list: dispatchList, >> type(None): dispatchNone >> }[type(x)] >> fn(x) >> > > True, but that would be useful only in a very few situations, where > you guarantee that you'll never get any subclasses. So if you're > walking something that was decoded from JSON, and you know for certain > that you'll only ever get those types (add float to the list and it's > basically covered), then yes, you might do this; and then I would say > that using "type(None)" is the correct spelling of it. This is actual code I have: @singledispatch def as_color(color): """Convert object to QColor.""" return QtGui.QColor(color) as_color.register(type(None), lambda x: QtGui.QColor(0, 0, 0, 0)) Stephan

3 2