python

Best option for Google App Engine Datastore and external database?

I need to get an App Engine app talking to and sharing data with an external database, The best option i can come up with is outputting the external database data to an xml file and then processing this in my app engine app and storing it inside the datastore, although the data being shared is sensitive data such as login details so ou...

queries in django

How to query Employee to get all the address related to the employee, Employee.Add.all() does not work.. class Employee(): Add = models.ManyToManyField(Address) parent = models.ManyToManyField(Parent, blank=True, null=True) class Address(models.Model): address_emp = models.CharField(max_length=512) description = mo...

how to define an array in python?

i want to define an array in python . how would i do that ? do i have to use list? ...

How to replace empty string with zero in comma-separated string?

"8,5,,1,4,7,,,,7,,1,9,3,6,,,8,6,3,9,,2,5,4,,,,,3,2,,,7,4,1,1,,4,,6,9,,5,,,,5,,,1,,6,3,,,6,5,,,,7,4,,1,7,6,,,,8,,5,,,7,1,,3,9," I'm doing a programming challenge where i need to parse this sequence into my sudoku script. Need to get the above sequence into 8,5,0,1,4,7,0,0,0,7,0,1,9,3,6,0,0,8......... I tried re but without success, help ...

How do I find out if the variable is declared in Python?

I want to use a module as a singleton referenced in other modules. It looks something like this (that's not actually a code I'm working on, but I simplified it to throw away all unrelated stuff): main.py import singleton import printer def main(): singleton.Init(1,2) printer.Print() if __name__ == '__main__': pass singleto...

Loading Files in AppEngine

I've got a tiny bit of code to display a file in app.yaml - url: /(.*\.(gif|png|jpg)) static_files: static/\1 upload: static/(.*\.(gif|png|jpg)) in main.py ... class ShowImage(webapp.RequestHandler): def get(self): rootpath = os.path.dirname(__file__) file = rootpath + "/static/tracker.gif"; fh=open(file, 'r'...

tmpfile and gzip combination problem

I have problem with this code: file = tempfile.TemporaryFile(mode='wrb') file.write(base64.b64decode(data)) file.flush() os.fsync(file) # file.seek(0) f = gzip.GzipFile(mode='rb', fileobj=file) print f.read() I dont know why it doesn't print out anything. If I uncomment file.seek then error occurs: File "/usr/lib/python2.5/gzip.py"...

how to create a pure browser/javascript search engine for a bunch of static files ?

Hello, I was wondering if there exists some kind of indexer (in python language for exemple) that would take a bunch of html files and create an index in javascript. In the solution, these javascript files would then be used to create a pure browser search engine. Jerome ...

Help with python list-comprehension

A simplified version of my problem: I have a list comprehension that i use to set bitflags on a two dimensional list so: s = FLAG1 | FLAG2 | FLAG3 [[c.set_state(s) for c in row] for row in self.__map] All set_state does is: self.state |= f This works fine but I have to have this function "set_state" in every cell in __map. Every c...

Django syncdb error

/mysite/project4 class notes(models.Model): created_by = models.ForeignKey(User) detail = models.ForeignKey(Details) Details and User are in the same module i.e,/mysite/project1 In project1 models i have defined class User(): ...... class Details(): ...... When DB i synced there is an error saying Error:...

[Django] How to find out whether a model's column is a foreign key?

I'm dynamically storing information in the database depending on the request: // table, id and column are provided by the request table_obj = getattr(models, table) record = table_obj.objects.get(pk=id) setattr(record, column, request.POST['value']) The problem is that request.POST['value'] sometimes contains a foreign record's prima...

What's the right way to use idlestartup on python 2.6.5?

Idlestartup is analogous to pythonstartup variable, but for IDLE, instead of command line. But it seems not to work properly. I'm using python 2.6.5 on Windows. I have the following script assigned to it: from pprint import pprint import sys newPath = 'C:\\Python26\test') sys.path.append(newPath) print "initial config loaded" Both va...

Problems with umlauts in python appdata environvent variable

Hi, I can't find a correct way to get the environment variable for the appdata path in python. The problem is that my user name includes special characters (the german ae and ue). I made a workaround wit PyQt for Vista and Windows 7 but it doesn't work for XP Systems. Does anybody know the correct encoding of these environment variabl...

How to output in the the log window in perforce client p4v using custom tools.

We're developing perforce custom tools in python and we're outputting messages during the script execution. It shows up in p4win but we're mainly using p4v and the output doesn't show up in the log window. Is there a way to output there or in any other pane without resorting to run the tool in a terminal window ? Thanks ...

How to call bash process from within django / wsgi?

I'm using mod_wsgi apache2 adapter for a django site and I like to call some bash process within a view, using the usual ... p = subprocess.Popen("/home/example.com/restart-tomcat.sh", shell=True) sts = os.waitpid(p.pid, 0)[1] ... This code works perfectly from within a usual python shell but does nothing (I can trace right now) when ...

Python: Getting the attribute name that the created object will be given

Before I ask this, do note: I want this for debugging purposes. I know that this is going to be some bad black magic, but I want to use it just during debugging so I could identify my objects more easily. It's like this. I have some object from class A that creates a few B instances as attributes: class A(object): def __init__(self...

Detect marker with opencv and python

Hi im trying to detect a marker in a webcam video feed and overlay it with a 3d object - pretty much exactly like this: http://www.morethantechnical.com/2009/06/28/augmented-reality-with-nyartoolkit-opencv-opengl/ i know artoolkit is the best module for this, but i was hoping to just use opencv in python since i dont know nearly enough...

What is the difference between type and type.__new__ in python?

I was writing a metaclass and accidentally did it like this: class MetaCls(type): def __new__(cls, name, bases, dict): return type(name, bases, dict) ...instead of like this: class MetaCls(type): def __new__(cls, name, bases, dict): return type.__new__(cls, name, bases, dict) What exactly is the difference b...

How do I insert video greater than 1MB with gdata.youtube api direct method

I am using the gdata.youtube service to insert a video entry. It is failing with a url fetch error complaining that the file is too large. It is a pretty small video (1.7MB). In an ideal world, there is a natural way to break up the file as necessary and stream it in chunks. Is there an api to do this already. Here is the code I am usin...

Is there a way to make python become interactive in the middle of a script?

I'd like to do something like: do lots of stuff to prepare a good environement become_interactive #wait for Ctrl-D automatically clean up Is it possible with python?If not, do you see another way of doing the same thing? ...