Lurchington posted:

Closing the file with either a with statement or a try-finally is usually better.


itertools.islice(open('your_file', 'rb'), -1, 0, -1)

Just kidding. It'd be neat though

Sailor_Spoon posted:

stuff

Sailor_Spoon posted:

Type checking is usually the wrong way to do things. Here, I would probably do something like ... and let either file mode errors or IOErrors bubble up

Sailor_Spoon posted:

Depends on your user, I guess. I'd much rather get an error then have the function return None, which could mean a lot of things.

Also, does a file that's not seekable still have the seek method? I assumed it does, so an error on seek would presumably not get caught by that except.

tef posted:

Thermopyle posted:

code:

>>> a_list = ["one", "two", "three"]
>>> "two" in a_list
True

Did I misunderstand what you meant?

Space Prostitute posted:

I believe that in general x in y is syntactic sugar for y.__contains__(x). This page has some details.

tef posted:

wart, no longer a feature in python 3

Rocko Bonaparte posted:

I'm trying to tie together .NET and native environments as much as possible. I am more familiar with IronPython, but I understand there's an alternative Python for .NET. IronPython puts the engine in the .NET runtime, whereas I believe Python for .NET is the CPython engine with hooks into .NET. Unfortunately I need both .NET and native stuff, and some COM just to really screw things up. I'm trying to figure out what options I have for making this as painless as possible.

An example of my woes: I'm trying to get Ironclad to load into IronPython because it claims to cover a lot of ctypes stuff. I can't get it to load into the .NET 4.0 runtime by default. I might figure it out; there's some app.config variable I think I can turn on to make it happy, or I might be able to recompile it. Still, that's own problem of many.

spengler posted:

I'm struggling with something pretty basic. I have an XML file that looks like this:

code:

?xml version="1.0" encoding="iso-8859-1"?>
<dcst:ServiceRequests xmlns:dcst="http://dc.gov/dcstat/types/1.0/">
    <dcst:ServiceRequest xmlns:dcst="http://dc.gov/dcstat/types/1.0/">
        <dcst:inspectiondate><![CDATA[2009-01-06T23:41:00-05:00]]></dcst:inspectiondate>
        <dcst:resolution><![CDATA[Complete]]></dcst:resolution>
        <dcst:resolutiondate><![CDATA[2009-01-06T23:41:00-05:00]]></dcst:resolutiondate>
        <dcst:serviceduedate><![CDATA[2009-01-05T01:56:00-05:00]]></dcst:serviceduedate>
        <dcst:servicenotes><![CDATA[Close Ticket.]]></dcst:servicenotes>
        <dcst:parentservicerequestid><![CDATA[]]></dcst:parentservicerequestid>
        <dcst:adddate><![CDATA[2009-01-01T00:00:00-05:00]]></dcst:adddate>
        <dcst:lastmodifieddate><![CDATA[2009-12-31T00:00:00-05:00]]></dcst:lastmodifieddate>
        <dcst:siteaddress><![CDATA[5312 NORTH CAPITOL STREET NW]]></dcst:siteaddress>
     </ServiceRequest>
   <dcst:ServiceRequest xmlns:dcst="http://dc.gov/dcstat/types/1.0/">
         <dcst:inspectiondate><![CDATA[2009-01-01T06:40:00-05:00]]></dcst:inspectiondate>
        <dcst:resolution><![CDATA[Complete]]></dcst:resolution>
        <dcst:resolutiondate><![CDATA[2009-01-01T06:40:00-05:00]]></dcst:resolutiondate>
        <dcst:serviceduedate><![CDATA[2009-01-01T07:11:00-05:00]]></dcst:serviceduedate>
        <dcst:servicenotes><![CDATA[]]></dcst:servicenotes>
        <dcst:parentservicerequestid><![CDATA[]]></dcst:parentservicerequestid>
        <dcst:adddate><![CDATA[2009-01-01T00:00:00-05:00]]></dcst:adddate>
        <dcst:lastmodifieddate><![CDATA[2009-12-31T00:00:00-05:00]]></dcst:lastmodifieddate>
        <dcst:siteaddress><![CDATA[]]></dcst:siteaddress>
        <geo:lat xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">0</geo:lat>
        <geo:long xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">0</geo:long>
    </ServiceRequest>

It has a ton of other nodes that I don't care about. All I want to do is parse this into some useful, simple data structure such that I end up with a list of associated inspectiondates, siteaddresses and resolutions. I've been playing with xml.dom.minidom.parse, and have not come up with anything helpful:

code:

import xml.dom.minidom
from xml.dom.minidom import Node
doc = xml.dom.minidom.parse("src.xml")
mapping = {}
i = 0 
for node in doc.getElementsByTagName("dcst:ServiceRequest"):
	address = node.getAttribute("dcst:siteaddress")
	mapping[i] = address
	i+=1

That gets me an object that has the same length as the number of elements I'm after, but nothing useful. Basically, I don't know what the gently caress I'm doing, but I think if someone gave me a snippet that returned something useful to me I could figure out how it's working and extend it to whatever I need. Can someone throw me a bone?

What I say "some useful data object", I don't really care what it looks like as long as I can easily extract an address along with it's associated resolution, and resolutionDate. This is also something I'm doing completely for fun that has nothing to do with my job, etc, so I'm not asking anyone to do my job-work for me.

leterip posted:

If your input has no elements, i is never created.

Python code:

>>> def foo():
...     for i in []:
...             pass
...     else:
...             print i
... 
>>> foo()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 5, in foo
UnboundLocalError: local variable 'i' referenced before assignment

duck monster posted:

Aaaaaand apple continues its tradition of wiping users python directorys instead of migrating them during operating system upgrades.

Hey apple, gently caress you. At least loving back that poo poo up you stupid cunts.

e: Oh hey mercurial has had its internal organs eviscerated by it too.

e2:

pliable posted:

What in the mother gently caress?

I want to try this but, 18 minutes to process...

bc87 posted:

Coming from a c++ background, serialization is so much easier using the pickle module.

Suspicious Dish posted:

"I'm helping all these people do their jobs, and without me, they couldn't work!"

BeefofAges posted:

Configure your editor to output four spaces when you hit tab.

yaoi prophet posted:

What's the idiomatic way for initializing a bunch of variables to the same value without that kind of sharing?

dedian posted:

I wrote a little script this weekend to calculate and store md5 hashes of files in a list of directories I point the script to, for the purpose of finding duplicates. I fully realize there's lots of tools to do this already, and do it better, but I wanted to write something myself as I get more familiar with Python (I keep meaning to go through Learn python the hard way or other tutorials ). Does any of this look like the completely wrong way of doing things? It seems like the for loops don't need to be as nested... somehow? List comprehensions, or.. something? Anyway, just something dumb to poke holes in on a Monday morning (I'm happy at least that it works )

http://pastie.org/7577472

Dominoes posted:

I got my program to work on Ubuntu running from source - everything works. (although the GUI fonts are too big for their buttons - easy fix) I looked up making a .deb file, and the instructions were complex, and seemed to require being on Linux to it.

Mr. Wynand posted:

I still don't quite get how input() is running at all during the retrieval unless you are already using a multithreaded or at least async lib. If you are then there is usually a way to control tasks and make them dependent on one of them finishing. I mean you said something about it being in a loop, so... stop the loop?

If you really really want to do this via input streams, sure, I mean you could just use something other then raw_input/input to which you can explicitly pass the input stream. This strikes me as a terribly awkward way of doing things though when you can just as easily control the thing reading from that stream (i.e. the input call) - at least from where I'm standing.

I'm sure there is a god awful way of suppressing stdin globally but that should almost certainly be your last option.

evensevenone posted:

Have you tried sys.stdin.flush()? I can't test it right now and terminals seem to defy all common sense but feel like that might work if you put it immediately before the input command.

Thermopyle posted:

Secondly, and I'm not as sure about myself here, I think the fact that a == True and a is True both give you the same result is implementation-specific. In other words, I think, that the next version of CPython could change that, or another implementation, like IronPython for example, might return False when you ask it to evaluate a is True, because conceptually a with the value True is a different object from True.

Hammerite posted:

I take it you are aware that "for row in inpt" is the inner loop here?

quote:

On the other hand, I do not understand how this code can be giving you the result you expect. I would expect it to give you "Product 1" for the first item, then "Product 2" for the second item, and so on until it runs out of product numbers.

sharktamer posted:

Has anyone used comments withing a ConfigParser config file? I can set up comments within the file like so:

code:

; This is a section
[SECTION]
; This is a setting
setting = value

but when I call the write method on the config file object, the comments are removed. I don't see any options in the documentation and I am using what seems to be the sanctioned comment syntax.

lostleaf posted:

Does anyone have any recommendations on python libraries that handle multitouch events from the trackpad or touchscreen? I'm looking to write a program like bettertouchtool(mac) or touchegg(linux) but for windows to customize multitouch events.

It seems like pyqt is an option. Another option is kiva or pymt. I haven't programmed for about 10 years and looking to learn python as a hobby that also fixes annoyances with windows 8.

Thermopyle posted:

I wish one of you smart, experienced motherfuckers would get off your rear end and make a good python game framework already. I hate having to tell newbies that their options aren't that great.

ahmeni posted:

Either someone will have to build Python bindings for Unity via some sort of IronPython wizardry or someone will have to build a cross-platform compatible game library that runs a Python engine on mobile platforms. Either way that's a lot of work.

Pollyanna posted:

...right I forgot to say, "define a function that has a name equal to page". I don't know if there's a way to do that, though...

Thermopyle posted:

One of you is saying on the new OP document to not suggest Windows users download the python.org Windows version but to instead download a Windows-specific distribution like...well like, I don't know what. But anyway...

My personal feelings on it are that when I was doing dev work on Windows I always preferred to use the official distribution and install whatever packages I wanted or needed. However, I must say that I didn't spend a lot of time evaluating other options as the whole idea of it just rubbed me the wrong way.

Does anyone have any thoughts about whether recommending Windows users use something other than the official distribution is a good idea?

In particular I'd like some thoughts from non-scientific users whom I think probably have different requirements than your average beginner. They're almost always whom I see talking about alternative distributions...

Pivotal Lever posted:

I mistook CoC for GBS 2.1, sorry! This thread could use more missiles, tbh.

Dren posted:

Lookaheads are cheating