python

Python: Convert format string to regular expression

The users of my app can configure the layout of certain files via a format string. For example, the config value the user specifies might be: layout = '%(group)s/foo-%(locale)s/file.txt' I now need to find all such files that already exist. This seems easy enough using the glob module: glob_pattern = layout % {'group': '*', 'locale'...

Boost Python : How to only expose the constructor of a class with virtual (pure & impure) methods

Hello, I'm a newbie with Boost::Python but I tried to search on the web to do so I want to expose a 3rd party library to Python. One of the class of the library (.hpp) is composed of a public constructor with arguments a protected constructor and functions various regular functions various pure virtual functions various non pure virt...

django link format words joined with hypens

href="http://www.torontolife.com/daily/daily-dish/restauranto/2010/03/10/best-new-restaurants-2010-james-chatto-names-five-honourable-mentions/">Best new restaurants 2010: honourable mentions does django have built in mechanism to format links above i mean words joined with hypens how can i achieve this ? ...

What's the equivalent of Ruby's class @@variable in Python?

In Ruby 1.9, I can use its class variable like the following: class Sample @@count = 0 def initialize @@count += 1 end def count @@count end end sample = Sample.new puts sample.count # Output: 1 sample2 = Sample.new puts sample2.count # Output: 2 How can I achieve the above in Python 2.5+ ? ...

Is it approproate it use django signals withing the same app

Trying to add email notification to my app in the cleanest way possible. When certain fields of a model change, app should send a notification to a user. Here's my old solution: from django.contrib.auth import User class MyModel(models.Model): user = models.ForeignKey(User) field_a = models.CharField() field_b = models.Ch...

How to allow resizing of QMessageBox in PyQt4

I'm using the nice feature in QMessageBox to optionally show detailed text to the user. However, the window after expansion is still fairly small, and one immediately tries to resize the window so more of the details are visible. Even after setting what I think are the proper settings it won't allow resizing. Here's the relevant snippet...

Error with python decorator

I get this error object has no attribute 'im_func' with this class Test(object): def __init__(self, f): self.func = f def __call__( self, *args ): return self.func(*args) pylons code: class TestController(BaseController): @Test def index(self): return 'hello world' full error: File '/en...

Stop execution of python script when parent Bash shell script is killed

I'm working on a Bash shell script that runs several Python scripts like so: cd ${SCRIPT_PATH} python -u ${SCRIPT_NAME} ${SCRIPT_ARGS} >> $JOBLOG 2>&1 At one point, I killed the shell script (using kill PID), but the Python script continued running, even after the script terminated. I thought these would die as soon as the main script...

Accessing data entered into multiple Django forms and generating them onto a new URL

I have a projects page where users can start up new projects. Each project has two forms. The two forms are: class ProjectForm(forms.Form): Title = forms.CharField(max_length=100, widget=_hfill) class SsdForm(forms.Form): Status = forms.ModelChoiceField(queryset=P.ProjectStatus.objects.all()) With their respective models as follows:...

ungetc in Python

Some file read (readlines()) functions in Python copy the file contents to memory (as a list) I need to process a file that's too large to be copied in memory and as such need to use a file pointer (to access the file one byte at a time) -- as in C getc(). The additional requirement I have is that I'd like to rewind the file pointe...

python unittest howto

I`d like to know how I could unit-test the following module. def download_distribution(url, tempdir): """ Method which downloads the distribution from PyPI """ print "Attempting to download from %s" % (url,) try: url_handler = urllib2.urlopen(url) distribution_contents = url_handler.read() url_handle...

mouse rollover event in Python (VPython)

Is there something similar to scene.mouse.getclick in the visual module (VPython)? I need it for a rollover. Thanks in advance. EDIT: I need a function for doing something when the mouse moves inside a special area without clicking. ...

Writing a DBMS in Python

Hey guys, I'm working on a basic DBMS as a pet project and planning to prototype in Python. I figure there's a reason there are only a few Python databases, and my gut agrees that my favorite language will be too slow to act as an honest performing database, but I'm looking forward to using it to learn what I need quickly. Would someo...

filtering elements from list of lists in Python?

I want to filter elements from a list of lists, and iterate over the elements of each element using a lambda. For example, given the list: a = [[1,2,3],[4,5,6]] suppose that I want to keep only elements where the sum of the list is greater than N. I tried writing: filter(lambda x, y, z: x + y + z >= N, a) but I get the error: <l...

ListCtrl - wxPython / Python

Hello everyone. My question is if we can assign/bind some value to a certain item and hide that value(or if we can do the same thing in another way). Example: Lets say the columns on ListCtrl are "Name" and "Description": self.lc = wx.ListCtrl(self, -1, style=wx.LC_REPORT) self.lc.InsertColumn(0, 'Name') self.lc.InsertColumn(1, 'Descri...

Cleaner way to get user name in pylons with repoze.name

in mako template, i use this ${request.environ['repoze.who.identity']['user']} and the render in controller: render('file.html') can i write this better without passing in parameter everytime? ...

Sending email from an web2py on GAE

I am trying to send a mail from my web2py app hosted on GoogleAppEngine. But it is not working. I used the mail function that was given with the web2py. Does anybody how to do this? I read in the GAE Documentation that python mail library would not work with GAE and GAE mail library has to be used. Does it also applies to web2py mail? Th...

Adding a font for use in ReportLab

I'm trying to add a font to the python ReportLab so that I can use it for a function. The function is using canvas.Canvas to draw a bunch of text in a PDF, nothing complicated, but I need to add a fixed width font for layout issues. When I tried to register a font using what little info I could find, that seemed to work. But when I tr...

Python: shutil.rmtree fails on Windows with 'Access is denied'

In Python, when running shutil.rmtree over a folder that contains a read-only file, the following exception is printed: File "C:\Python26\lib\shutil.py", line 216, in rmtree rmtree(fullname, ignore_errors, onerror) File "C:\Python26\lib\shutil.py", line 216, in rmtree rmtree(fullname, ignore_errors, onerror) File "C:\Python26\l...

Handle incorrect user/password repoze.who gracefully in Python/Pylons

im using FriendlyFormPlugin, but would like to retrieve the username that was input as part of the request.params, but its no longer there when i check. this way i can set the default for username if the password is incorrect. thanks ...