I need to run a CPU- and memory-heavy Python script (analyzing and altering a lengthy WAV file) as a background process on my web server (a VPS), between HTTP requests. The script takes up to 20 seconds to run and I am concerned about the performance on my server. Is there a good approach to either lower the priority of the process, per...
How do I list all tga files in a directory (non recursive) in Python? ...
I'm looking to build a caching decorator that given a function caches the result of the function to a location specified in the decoration. Something like this: @cacheable('/path/to/cache/file') def my_function(a, b, c): return 'something' The argument to the decorator is completely separate from the argument to the function it's ...
return sum(jobrecord.get_cost() or 0 for jobrecord in self.project.jobrecord_set.filter( date__lte=date, date__gte=self.start_date) or 0) ...
What is the "django-way" of specifying channel image in rss feed? I can do it manually by rolling my own xml, but was looking for a proper way of doing it. Edit dobrych's solution is not quite applicable here because I was asking specifically about RSS not Atom feeds ...
I'm trying to use the admin datepicker in my own django forms. Roughly following the discussion here : http://www.mail-archive.com/[email protected]/msg72138.html I've a) In my forms.py included the line from django.contrib.admin import widgets b) and used the widget like this : date = forms.DateTimeField(widget=widget...
Given the documentation at http://docs.python.org/library/threading.html which states for Thread.run(): You may override this method in a subclass. The standard run() method invokes the callable object passed to the object’s constructor as the target argument, if any, with sequential and keyword arguments taken from the args and kwar...
I am stuck with a fairly complex Python module that does not return useful error codes (it actually fails disturbingly silently). However, the underlying C library it calls sets errno. Normally errno comes in over OSError attributes, but since I don't have an exception, I can't get at it. Using ctypes, libc.errno doesn't work because e...
I want to debug a python project The problem is, I don't know where to set a break point, what I want to do, is be able to call a method SomeClass( some_ctor_arguments ).some_method()` and have the debugger be fired right away How do I do that? I tried pdb.run( string_command ) but it doesn't seem to work right >>> import pdb >>...
If I am evaluating a Python string using eval(), and have a class like: class Foo(object): a = 3 def bar(self, x): return x + a What are the security risks if I do not trust the string? In particular: Is eval(string, {"f": Foo()}, {}) unsafe? That is, can you reach os or sys or something unsafe from a Foo instance? Is eval(s...
I have a project where in I collect all the wikipedia articles belonging to a particular category, pull out the dump from the wikipedia, and put it into our db. So I should be parsing wikipedia dump file to get the stuff done. Do we have an efficient parser to do this job. I am a python developer. So I prefer any parser in python. If not...
Is there a simple way of testing if the generator has no items, like peek, hasNext, isEmpty, something along those lines? ...
I want to have an application writing out information at the same time that a monitor is reading it. The application is "embedded" (and on Win32 XP) and so has restricted memory and I/O functionality. The simplest way I can think to do this is by writing the data to a buffer file from the application, and then read the same file using t...
I have this view in my app: def context_detail(request, context_id): c = get_object_or_404(Context, pk=context_id) scs = SherdCount.objects.filter(assemblage__context=c).exclude(count__isnull=True) total = sum(sc.count for sc in scs) table = [] forms = [] for a in c.assemblage_set.all(): for sc in a.sherdcount_set.all(): for...
Is there a way I can preserve the original order of attributes when processing XML with minidom? Say I have: <color red="255" green="255" blue="233" /> when I modify this with minidom the attributes are rearranged alphabetically blue, green, and red. I'd like to preserve the original order. I am processing the file by looping through t...
How can I do this in Python/PIL? I.e., given the four points of an offset rectangle (a photographed document), make it look flat on as if it were scanned. Is there a simple algorithm for it? Also, are there any other manipulations I should do to make it look more "scan-like"? I want to make a simple version of this program for myself ...
I am trying to modify a trac plugin that allows downloading of wiki pages to word documents. pagetodoc.py throws an exception on this line: # Call the subprocess using convenience method retval = subprocess.call(command, shell=True, stderr=errptr, stdout=outptr, close_fds = True) Saying that close_fds is not supported on Windows. The ...
Can I write web application that I can host on Windows(IIS web server) and Linux (Apache or lighttpd) without any changes? CGI? Maybe something new? WSGI | FastCGI ? ...
Does anyone know an easy way in Python to convert a string with HTML entity codes (e.g. < &) to a normal string (e.g. < &)? cgi.escape() will escape strings (poorly), but there is no unescape(). ...
Is there a way to substring a string in Python, to get a new string from the 3rd character to the end of the string? Maybe like myString[2:end]? EDIT: If leaving the second part means 'till the end', if you leave the first part, does it start from the start? ...