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  • urlencode an array of values

    - by Ikke
    I'm trying to urlencode an dictionary in python with urllib.urlencode. The problem is, I have to encode an array. The result needs to be: criterias%5B%5D=member&criterias%5B%5D=issue #unquoted: criterias[]=member&criterias[]=issue But the result I get is: criterias=%5B%27member%27%2C+%27issue%27%5D #unquoted: criterias=['member',+'issue'] I have tried several things, but I can't seem to get the right result. import urllib criterias = ['member', 'issue'] params = { 'criterias[]': criterias, } print urllib.urlencode(params) If I use cgi.parse_qs to decode a correct query string, I get this as result: {'criterias[]': ['member', 'issue']} But if I encode that result, I get a wrong result back. Is there a way to produce the expected result?

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  • Why allow concatenation of string literals?

    - by Caspin
    I recently got bit by a subtle bug. char ** int2str = { "zero", // 0 "one", // 1 "two" // 2 "three",// 3 nullptr }; assert( values[1] == "one"_s ); // passes assert( values[2] == "two"_s ); // fails If you have godlike code review powers you'll notice I forgot the , after "two". After the considerable effort to find that bug I've got to ask why would anyone ever want this behavior? I can see how this might be useful for macro magic, but then why is this a "feature" in a modern language like python? Have you ever used string literal concatenation in production code?

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  • django admin: Add a "remove file" field for Image- or FileFields

    - by w-
    I was hunting around the net for a way to easily allow users to blank out imagefield/filefields they have set in the admin. I found this http://www.djangosnippets.org/snippets/894/ What was really interesting to me here was the code posted in the comment by rfugger remove_the_file = forms.BooleanField(required=False) def save(self, *args, **kwargs): object = super(self.__class__, self).save(*args, **kwargs) if self.cleaned_data.get('remove_the_file'): object.the_file = '' return object When i try to use this in my own form I basically added this to my admin.py which already had a BlahAdmin class BlahModelForm(forms.ModelForm): class Meta: model = Blah remove_img01 = forms.BooleanField(required=False) def save(self, *args, **kwargs): object = super(self.__class__, self).save(*args, **kwargs) if self.cleaned_data.get('remove_img01'): object.img01 = '' return object when i run it I get this error maximum recursion depth exceeded while calling a Python object at this line object = super(self.__class__, self).save(*args, **kwargs) When i think about it for a bit, it seems obvious that it is just infinitely calling itself causing the error. My problem is i can't figure out what is the correct way i should be doing this. Any suggestions? thanks

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  • Comparison of the multiprocessing module and pyro?

    - by fivebells
    I use pyro for basic management of parallel jobs on a compute cluster. I just moved to a cluster where I will be responsible for using all the cores on each compute node. (On previous clusters, each core has been a separate node.) The python multiprocessing module seems like a good fit for this. I notice it can also be used for remote-process communication. If anyone has used both frameworks for remote-process communication, I'd be grateful to hear how they stack up against each other. The obvious benefit of the multiprocessing module is that it's built-in from 2.6. Apart from that, it's hard for me to tell which is better.

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  • User management API

    - by Akshey
    Hi, I am developing an application suite where users will need to connect to a server and depending on their account type they will be given some services. The server will run Linux. Can you please suggest me some user management API which I can use to develop the server program? By user management I mean user authentication and other related functionalities. I prefer to work in C++ or python, but any other language should not be a problem. Please note that this application suite is not web based. Due to security issues, I do not want to give each user a separate account on the linux server. Thanks, Akshey

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  • Getting BeautifulSoup to find a specific <p>

    - by Ryan
    I'm trying to put together a basic HTML scraper for a variety of scientific journal websites, specifically trying to get the abstract or introductory paragraph. The current journal I'm working on is Nature, and the article I've been using as my sample can be seen at http://www.nature.com/nature/journal/v463/n7284/abs/nature08715.html. I can't get the abstract out of that page, however. I'm searching for everything between the <p class="lead">...</p> tags, but I can't seem to figure out how to isolate them. I thought it would be something simple like from BeautifulSoup import BeautifulSoup import re import urllib2 address="http://www.nature.com/nature/journal/v463/n7284/full/nature08715.html" html = urllib2.urlopen(address).read() soup = BeautifulSoup(html) abstract = soup.find('p', attrs={'class' : 'lead'}) print abstract Using Python 2.5, BeautifulSoup 3.0.8, running this returns 'None'. I have no option of using anything else that needs to be compiled/installed (like lxml). Is BeautifulSoup confused, or am I?

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  • Best DataMining Database

    - by Eric
    I am an ocasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small compamy and I have been started a new project where I think it is about time to try new databases. Sales departament makes a CSV dump every week and I need to make a small scripting application that allow people form other departaments mixing the information, mostly linking the records. I have all this solved, my problem is the speed, I am using just plain text files for all this and unsurprisingly it is very slow. I thought about using mysql, but then I need installing mysql in every desktop, sqlite is easier, but it is very slow. I do not need a full relational database, just some way of play with big amounts of data in a decent time. Many thanks!

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  • Thrift client-server multiple roles

    - by dexter
    Hi, this is my first question, so sorry if the form is wrong! I'm trying to make thrift server (python) and client (c++). However I need to exchange messages in both direction. Client should register (call server's function and wait), and server should listen on same port for N (N- 100k) incoming connections (clients). After some conditions are satisfied, server needs to call functions on each client and collect results and interpret them. I'm little confused, and first questions is "can this be done in Thrift"? Second question is related to mechanism that will allow me bidirectional communication. I guess that I will need two services. One with client's functions other with server's. But I'm confused with calling code. I understand one way communication (calling functions from server), but with calling functions from client side I have a problem. Any suggestions??? Thanks!

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  • Implementing a Patricia Trie for use as a dictionary

    - by Regis Frey
    I'm attempting to implement a Patricia Trie with the methods addWord(), isWord(), and isPrefix() as a means to store a large dictionary of words for quick retrieval (including prefix search). I've read up on the concepts but they just aren't clarifying into an implementation. I want to know (in Java or Python code) how to implement the Trie, particularly the nodes (or should I implement it recursively). I saw one person who implemented it with an array of 26 child nodes set to null/None. Is there a better strategy (such as treating the letters as bits) and how would you implement it?

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  • Game cross-compiling and packaging

    - by Helltone
    Hi, Some friends and I wanted to develop a game. Any language will do. I've been programming in C for years, but never wrote a game before. One of us knows SDL a little bit. It would also be a nice excuse to learn Python+pygame. We wish our game to be 'standalone'. By standalone, I mean most users (at least Linux, Mac and Windows) will not have to manually download and install anything else apart from a package. It is ok if the installation automatically handles missing dependencies. If the packages contain binaries, we wish to be able to generate them using cross-compilation from Linux. How should we package and structure the project, and what language is best suited?

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  • pygtk - dynamically update the widgets taking input from the gtk combo box

    - by Webrsk
    On selecting value from 1 to 10 from gtk combox box it should populate the checkbox by taking combo box value as an input. Say for example if i select 5 then 5 checkbox will be generated. It works.. But the issue is after i selected 5 now im selecting next value as 3 from combo box then there 8 checkboxes are displayed. The old 5 checkbox didnt get replaced. Is there any way to refresh the vbox(which has the checkboxes) or update to a new value. Enviroment : FC10 , Glade 2 , Python 2.5 , GTK.

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  • What should I use - Mako or Django?

    - by mridang
    Hi guys, I'm making a website that mail users when a movie or a pc game has released. It isn't too complex - users can sign up, choose movies/music or a genre and save the settings. When the movie/music is released - it mails the user. Some other functionality too but this is the jist. Now, I've been working with Python for a bit but mainly in the area of console apps. For web: what should I use, the web framework Django or the templating engine Mako? I can't seem to decide between the two. :( Thanks

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  • Simplest language to make an interpreter for

    - by None
    I want to make an interpreter of a very simple language for practice. When I say simple I don't mean easy to use, I mean simple. Brainf**k is a good example of a language I want. I already have made a brainf**k interpreter in python (which is the language I would be using to write the interpreter). I would appreciate any suggestions of simple languages. Note: I don't want to make a compiler! I want to make an interpreter.

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  • Migrating from CPython to Jython

    - by itsadok
    I'm considering moving my code (around 30K LOC) from CPython to Jython, so that I could have better integration with my java code. Is there a checklist or a guide I should look at, to help my with the migration? Does anyone have experience with doing something similar? From reading the Jython site, most of the problems seem too obscure to bother me. I did notice that: thread safety is an issue Unicode support seems to be quite different, which may be a problem for me mysqldb doesn't work and needs to be replaced with zxJDBC Anything else? Related question: What are some strategies to write python code that works in CPython, Jython and IronPython

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  • this is my Receiving Email code,but can't Receiving Email .. (google-app-engine)

    - by zjm1126
    import logging, email from google.appengine.ext import webapp from google.appengine.ext.webapp.mail_handlers import InboundMailHandler from google.appengine.ext.webapp.util import run_wsgi_app class LogSenderHandler(InboundMailHandler): def receive(self, message): _subject = message.subject _sender=message.sender bodies = message.bodies('text/plain') allBodies = "" #for body in bodies: # allBodies = allBodies + "\n---------------------------\n" + body[1].decode() #m= mail.EmailMessage(sender="[email protected] ",subject="reply to "+_subject) #m.to = _sender #m.body =allBodies #m.send() message = mail.EmailMessage(sender="[email protected]", subject="Your account has been approved") message.to = _sender message.body = """ Dear Albert: Your example.com account has been approved. You can now visit http://www.example.com/ and sign in using your Google Account to access new features. Please let us know if you have any questions. The example.com Team """ message.send() application = webapp.WSGIApplication([LogSenderHandler.mapping()], debug=True) app.yaml: application: zjm1126 version: 1-2 runtime: python api_version: 1 inbound_services: - mail handlers: - url: /media static_dir: media - url: /_ah/mail/.+ script: handle_incoming_email.py login: admin - url: / script: a.py - url: /sign script: a.py - url: .* script: django_bootstrap.py i use my email:[email protected] send some words to [email protected] but i can't get a Receiving Email, why ??? thanks and this is the log:

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  • pdb show different variable values than print statements

    - by martin
    Hi, everyone. I am debugging a python module with homemade c extensions. The output seems correct when I print it with 'p' in pdb. But if I use a normal print statement or pickle it, the output is wrong. What could be causing pdb to show different values than normal execution? I can even step to the print statement in debug mode, and pdb will show the correct value but the program will print the wrong one. The problem seems to happen only when I have called a certain c extension earlier. Glad to post code if that helps. Thank you.

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  • Why does TheyWorkForYou (TWFY) web API always returns '{}'

    - by Tartley
    I'm calling a web API exposed by TheyWorkForYou (TWFI). http://www.theyworkforyou.com/api/ I'm using the Python bindings provided by twfython: http://code.google.com/p/twfython/ I wrote some code to call this API a few months ago, at which time it worked fine. But now I dig it out to run it again, no matter what query I ask of the API, it always returns '{}' (an empty dictionary). For example the following code, which should return a list of all MPs: from twfy import TWFY API_KEY = 'XXXXXXXXXXXXXXXXXXXXXX' twfy = TWFY.TWFY(API_KEY) print twfy.api.getMPs(output='js') Am I being really dumb? What else should I check?

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  • Seeking enlightenment - global variables in AppEngine (aeoid.get_current_user())

    - by jerd
    Hello This may be a 'Python Web Programming 101' question, but I'm confused about some code in the aeoid project (http://github.com/Arachnid/aeoid). here's the code: _current_user = None def get_current_user(): """Returns the currently logged in user, or None if no user is logged in.""" global _current_user if not _current_user and 'aeoid.user' in os.environ: _current_user = User(None, _from_model_key=os.environ['aeoid.user']) return _current_user But my understanding was that global variables were, ehm, global! And so different requests from different users could (potentially) access and update the same value, hence the need for sessions, in order to store per-user, non-global variables. So, in the code above, what prevents one request from believing the current user is the user set by another request? Sorry if this is basic, it's just not how i thought things worked. Thanks

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  • Printing Stdout In Command Line App Without Overwriting Pending User Input

    - by Chris S
    In a basic Unix-shell app, how would you print to stdout without disturbing any pending user input. e.g. Below is a simple Python app that echos user input. A thread running in the background prints a counter every 1 second. import threading, time class MyThread( threading.Thread ): running = False def run(self): self.running = True i = 0 while self.running: i += 1 time.sleep(1) print i t = MyThread() t.daemon = True t.start() try: while 1: inp = raw_input('command> ') print inp finally: t.running = False Note how the thread mangles the displayed user input as they type it (e.g. hell1o wo2rld3). How would you work around that, so that the shell writes a new line while preserving the line the user's currently typing on?

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  • "TypeError: draw() takes exactly 1 non-keyword argument (3 given)"

    - by Amorack
    I wrote this code to open a window with Pyglet in Python... import pyglet from pyglet import window class Window(pyglet.window.Window): def __init__(self): super(Window, self).__init__() myLabel = pyglet.text.Label("Prototype") windowText = myLabel.draw(Window, "Hello World", font_name = "Times New Roman", font_size = 36, color = (193, 205, 193, 255)) def on_draw(self): self.clear() self.label.draw() if __name__ == '__main__': window = Window() pyglet.app.run() however every time I run it I get this error: TypeError: draw() takes exactly 1 non-keyword argument (3 given) AFAIK the "(3 given)" means the problem is with the font_size or color arguments but I'm not sure. Could someone explain what's wrong and help me make this work?

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  • append a numpy array to a numpy array

    - by Fraz
    I just started programming in python and am very new to numpy packages.. so still trying to get a hang of it. I have a an numpy_array so something like [ a b c] And then I want to append it into anotehr numpyarray (Just like we create a list of lists) How do we create an array of numpy arrays containing numpy arrays I tried to do the following without any luck >>> M = np.array([]) >>> M array([], dtype=float64) >>> M.append(a,axis=0) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'numpy.ndarray' object has no attribute 'append' >>> a array([1, 2, 3])

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  • django app using amazon aws s3 storage in stead of DB?

    - by farble1670
    new to python here so bear with me ... i'm looking at django for a rapid prototype to a photo sharing app with an amazon aws s3 storage back end. however, as far as i can tell, django is tailored toward the typical database MVC type of pattern. is there a way to for example provide a custom django model implementation that talks to s3 in stead of a DB? a custom DB engine? would either of these be practical, or am i looking in the wrong direction? thanks.

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  • undefined symbol: PyUnicodeUCS2_Decode whilst trying to install psycopg2

    - by Marco Fucci
    I'm getting an error whilst trying to install psycopg2 on ubuntu 9.10 64 bit. The error is: >>> import psycopg2 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "psycopg2/__init__.py", line 69, in <module> from _psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID ImportError: psycopg2/_psycopg.so: undefined symbol: PyUnicodeUCS2_Decode I've tried downloading the package from http://initd.org/pub/software/psycopg/ and installing it. I've tried by using easy_install too. No error during the installation. It's quite weird as my python (2.6.2) has been compiled with UCS4 and so the installation should just work without problems. Any help would be appreciated. Cheers

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  • Gantt Chart online

    - by Luca
    I need to insert a horizontal bar chart in a web page. The thing I have to do is very similar to a Gantt Chart. I'd like to use a javascript library for the purpose. I tried jsgantt, but actually it is not very beautiful. I could evaluate also a server generation of the graph. In case my server side language is Python. It will be part of an internal project with no internet access, so Google Charts isn't an option.

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  • Why can't I download a whole image file with urllib2.urlopen()

    - by John Gann
    When I run the following code, it only seems to be downloading the first little bit of the file and then exiting. Occassionally, I will get a 10054 error, but usually it just exits without getting the whole file. My internet connection is crappy wireless, and I often get broken downloads on larger files in firefox, but my browser has no problem getting a 200k image file. I'm new to python, and programming in general, so I'm wondering what nuance I'm missing. import urllib2 xkcdpic=urllib2.urlopen("http://imgs.xkcd.com/comics/literally.png") xkcdpicfile=open("C:\\Documents and Settings\\John Gann\\Desktop\\xkcd.png","w") while 1: chunk=xkcdpic.read(4028) if chunk: print chunk xkcdpicfile.write(chunk) else: break

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