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• What is the best way to map windows drives using Python?

  - by Gary Willoughby

  What is the best way to map a network share to a windows drive using Python? This share also requires a username and password.

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• In Python, can an object have another object as an attribute?

  - by ChrisC

  In Python, can an object have another object as an attribute? For example, can a class called car have a class called tire as an attribute?

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• Can I avoid a threaded UDP socket in Python dropping data?

  - by 666craig

  First off, I'm new to Python and learning on the job, so be gentle! I'm trying to write a threaded Python app for Windows that reads data from a UDP socket (thread-1), writes it to file (thread-2), and displays the live data (thread-3) to a widget (gtk.Image using a gtk.gdk.pixbuf). I'm using queues for communicating data between threads. My problem is that if I start only threads 1 and 3 (so skip the file writing for now), it seems that I lose some data after the first few samples. After this drop it looks fine. Even by letting thread 1 complete before running thread 3, this apparent drop is still there. Apologies for the length of code snippet (I've removed the thread that writes to file), but I felt removing code would just prompt questions. Hope someone can shed some light :-) import socket import threading import Queue import numpy import gtk gtk.gdk.threads_init() import gtk.glade import pygtk class readFromUDPSocket(threading.Thread): def __init__(self, socketUDP, readDataQueue, packetSize, numScans): threading.Thread.__init__(self) self.socketUDP = socketUDP self.readDataQueue = readDataQueue self.packetSize = packetSize self.numScans = numScans def run(self): for scan in range(1, self.numScans + 1): buffer = self.socketUDP.recv(self.packetSize) self.readDataQueue.put(buffer) self.socketUDP.close() print 'myServer finished!' class displayWithGTK(threading.Thread): def __init__(self, displayDataQueue, image, viewArea): threading.Thread.__init__(self) self.displayDataQueue = displayDataQueue self.image = image self.viewWidth = viewArea[0] self.viewHeight = viewArea[1] self.displayData = numpy.zeros((self.viewHeight, self.viewWidth, 3), dtype=numpy.uint16) def run(self): scan = 0 try: while True: if not scan % self.viewWidth: scan = 0 buffer = self.displayDataQueue.get(timeout=0.1) self.displayData[:, scan, 0] = numpy.fromstring(buffer, dtype=numpy.uint16) self.displayData[:, scan, 1] = numpy.fromstring(buffer, dtype=numpy.uint16) self.displayData[:, scan, 2] = numpy.fromstring(buffer, dtype=numpy.uint16) gtk.gdk.threads_enter() self.myPixbuf = gtk.gdk.pixbuf_new_from_data(self.displayData.tostring(), gtk.gdk.COLORSPACE_RGB, False, 8, self.viewWidth, self.viewHeight, self.viewWidth * 3) self.image.set_from_pixbuf(self.myPixbuf) self.image.show() gtk.gdk.threads_leave() scan += 1 except Queue.Empty: print 'myDisplay finished!' pass def quitGUI(obj): print 'Currently active threads: %s' % threading.enumerate() gtk.main_quit() if __name__ == '__main__': # Create socket (IPv4 protocol, datagram (UDP)) and bind to address socketUDP = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) host = '192.168.1.5' port = 1024 socketUDP.bind((host, port)) # Data parameters samplesPerScan = 256 packetsPerSecond = 1200 packetSize = 512 duration = 1 # For now, set a fixed duration to log data numScans = int(packetsPerSecond * duration) # Create array to store data data = numpy.zeros((samplesPerScan, numScans), dtype=numpy.uint16) # Create queue for displaying from readDataQueue = Queue.Queue(numScans) # Build GUI from Glade XML file builder = gtk.Builder() builder.add_from_file('GroundVue.glade') window = builder.get_object('mainwindow') window.connect('destroy', quitGUI) view = builder.get_object('viewport') image = gtk.Image() view.add(image) viewArea = (1200, samplesPerScan) # Instantiate & start threads myServer = readFromUDPSocket(socketUDP, readDataQueue, packetSize, numScans) myDisplay = displayWithGTK(readDataQueue, image, viewArea) myServer.start() myDisplay.start() gtk.gdk.threads_enter() gtk.main() gtk.gdk.threads_leave() print 'gtk.main finished!'

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• What are common mistakes PHP programmers make when developing in Python?

  - by ensnare

  Perhaps by compiling a list of common errors or coding style differences PHP coders make when first starting out with Python, we can help to avoid headaches later on. (Or at least I can :).

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• How to teach beginners reversing a string in Python?

  - by Tomaž Pisanski

  I am teaching an undergraduate course "Introduction to Computer Programming". How should I teach reversing a string in Python?

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• Is it possible to read Fortran formatted data in Python?

  - by Werner

  I get output files from very old Fortran programs, which look like: 0.81667E+00 -0.12650E+01 -0.69389E-03 0.94381E+00 -0.11985E+01 -0.11502E+00 0.96064E+00 -0.11333E+01 -0.17616E+00 0.10202E+01 -0.12435E+01 -0.93917E-01 0.10026E+01 -0.10904E+01 -0.15108E+00 0.90516E+00 -0.11030E+01 -0.19139E+00 0.98624E+00 -0.11598E+01 -0.22970E+00 Is it possible to read this in Python and convert the numbers to "normal" floats?

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• How exactly does a python (django) request happen? does it have to reparse all the codebase?

  - by Blankman

  With a scripting language like python (or php), things are not compiled down to bytecode like in .net or java. So does this mean that on every request, it has to go through the entire application and parse/compile it? Or at least all the code required for the given call stack?

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• Do you use the get/set paradigm when programming in python?

  - by Avery Payne

  Question says it all. Using get/set seems to be a common practice in Java (for various reasons) but I hardly see source in Python that uses this.

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• How do I pass a Python Variable to Bash?

  - by user336537

  Hello, How would I pass a Python variable to the Bash shell? It should work like this: foo="./RetVar.py 42" Replace the double-quotes with `s I have tried printing and sys.exiting the result, but to no avail. How would I accomplish my goal?

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• How do you read a cell's value from an OpenOffice Calc .ods file with python?

  - by user329257

  I have been able to read an excel cell value with xlrd using column and row numbers as inputs. Now I need to access the same cell values in some spreadsheets that were saved in .ods format. So for example, how would I read the value stored in cell E10 from a .ods file from python?

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• How to get path to the installed GIT in Python?

  - by Vladimir Prudnikov

  I need to get a path to the GIT on Max OS X 10.6 using Python 2.6.1 into script variables. I use this code for that: r = subprocess.Popen(shlex.split("which git"), stdout=subprocess.PIPE) print r.stdout.read() but the problem is that output is empty (I tried stderr too). It works fine with another commands such as pwd or ls. Can anyone help me with that?

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• Transitioning from php to python/pylons/SQLAlchemy -- Are ORMs the standard now?

  - by EmpireJones

  Should I invest a lot of time trying to figure out an ORM style implementation, or is it still common to just stick with standard SQL queries in python/pylons/sqlalchemy?

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• how to print chinese word in my code.. using python

  - by zjm1126

  this is my code: print '??'.decode('gb2312').encode('utf-8') and it print : SyntaxError: Non-ASCII character '\xe5' in file D:\zjm_code\a.py on line 2, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details how to print '??' thanks

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• Can't install Mercurial on Mac OS X 10.5.8

  - by Peter

  Hi When selecting the volume in the installation program it says "You cannot install Merucrial on this volume. Mercurial requires Apple Python 2.6". I tried installing the latest version of Python from python.org but no luck. Regards Peter

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• How do I open the default mail program with a subject in Python in a cross-platform way?

  - by chirag

  I am trying to add the ability to send mails using the default mail client from my python app. It can be done with the webbrowser module by opening a 'mailto:' URI. But, is there a better and direct way to do this like java's Desktop.mail(URI). Thanks in advance.

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• Python - time.clock() vs. time.time() - accuracy?

  - by Corey Goldberg

  Which is better to use for timing in Python? time.clock() or time.time()? Which one provides more accuracy? for example: start = time.clock() ... do something elapsed = (time.clock() - start) vs. start = time.time() ... do something elapsed = (time.time() - start)

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• How to make lists automatically instantiate on use in Python as they do in Perl?

  - by aXqd

  In Perl, I can do this: push(@{$h->[x]}, y); Can I simplify the following python codes according to above Perl example? if x not in h: h[x] = [] h[x].append(y) I want to simplify this, because it goes many places in my code, (and I cannot initialize all possible x with []). I do not want to make it a function, because there is no 'inline' keyword. Any ideas?

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• I need to authenticate against one db with python and openfire. How do I do this?

  - by Ethan

  Its not urgent but I was just wondering how one would go about authenticating against a single db using python and openfire? Is there a simple module that will do this?

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• Where can I find good ajax support in Java/Python ?

  - by HJ-INCPP

  Hello, I want a framework (or anything) that helps me make rich client guis. I know my server-side, but I don't like programming in ajax, javascript, css etc. Something that wraps the ajax code in some objects/methods with clean syntax, would do the trick. I want to write code in java instead of defining css and html tags. Does Java Spring, JSF, Django support this ? Languages: Java, Python Thank you

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• How do I prevent a file from being copied using Python?

  - by Zachary Brown

  I have a file that I need to "protect" so that it cannot be copied! I am using Python on Windows XP. I think it may just be changing file permissions??

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• How can I do the multiple replace in python?

  - by prosseek

  As asked and answered in HERE, I need to replace '[' with '[[]', and ']' with '[]]'. I tried to use s.replace(), but as it's not in place change, I ran as follows to get a wrong anwser. path1 = "/Users/smcho/Desktop/bracket/[10,20]" path2 = path1.replace('[','[[]') path3 = path2.replace(']','[]]') pathName = os.path.join(path3, "*.txt") print pathName -- /Users/smcho/Desktop/bracket/[[[]]10,20[]]/*.txt How can I do the multiple replace in python? Or how can I replace '[' and ']' at the same time?

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• Using Suds for SOAP in python, are suds.client.Client objects thread safe?

  - by kdt

  I'm using Suds to access a SOAP web service from python. If I have multiple threading.Thread threads of execution, can each of them safely access the same suds.client.Client instance concurrently, or must I create separate Client objects for each thread?

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• Parsing <geo:lat>, <geo:long> tags value using feedparser in python!

  - by rahman.bd

  Hello, I am using feedparser for parsing from XML file.But I couldn't parse <geo:lat>, <geo:long> tags using feedparser from that file! Do you people have any idea how I can parse those tags using feedparser in python? Thanks in advance!

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• Are there any concerns I should have about storing a Python Lock object in a Beaker session?

  - by Jack

  There is a certain page on my website where I want to prevent the same user from visiting it twice in a row. To prevent this, I plan to create a Lock object (from Python's threading library). However, I would need to store that across sessions. Is there anything I should watch out for when trying to store a Lock object in a session (specifically a Beaker session)?

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• How do you determine which file is imported in Python with an "import" statement?

  - by litghost

  How do you determine which file is imported in Python with an "import" statement? I am want to determine that I am loading the correct version of a locally modified .py file. Basically the equivalent of "which" in a POSIX environment.

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