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• Are xlrd and xlwt compatible?

  - by Leo

  I'm trying to create a workbook with python and I need to test the values of different cells to fill it but I'm having some troubles. I use xlrd and xlwt to create and edit the excel file. I've made a little example of my problem and I don't understand why it's not working. import xlwt import xlrd wb = xlwt.Workbook() ws = wb.add_sheet('Test') ws.write(0,0,"ah") cell = ws.cell(0,0) # AttributeError: 'Worksheet' object has no attribute 'cell' print cell.value I had taken for granted that xlrd and xlwt have shared classes which can interact with each other but it doesn't seem to be the case. How do I get the cell value of an open Worksheet object?

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• How can I fix "[Error 6] The handle is invalid." with PySerial

  - by alnorth29

  I'm trying to connect to my phone from my Windows 7 PC using PySerial with the following code: import wmi import serial c = wmi.WMI() modem = c.query("SELECT * FROM Win32_POTSModem").pop() ser = serial.Serial(modem.AttachedTo, modem.MaxBaudRateToSerialPort) try: ser.write('at \r\n') print ser.readline() finally: ser.close() But get the following error on the write call: Traceback (most recent call last): File "D:\Alasdair\Documents\Python Scripts\Phone Interface\test.py", line 14, in <module> ser.write('at \r\n') File "C:\Python26\Lib\site-packages\serial\serialwin32.py", line 255, in write raise SerialException("WriteFile failed (%s)" % ctypes.WinError()) SerialException: WriteFile failed ([Error 6] The handle is invalid.) I've tried connecting with TeraTerm and that works fine, so it's not a problem with the connection to the phone itself. I've been searching around for ages trying to find a solution but haven't come up with anything that works. Any ideas?

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• How do I make this simple list comprehension?

  - by Carson Myers

  I'm new to python, and I'm trying to get to know the list comprehensions better. I'm not even really sure if list comprehension is the word I'm looking for, since I'm not generating a list. But I am doing something similar. This is what I am trying to do: I have a list of numbers, the length of which is divisible by three. So say I have nums = [1, 2, 3, 4, 5, 6] I want to iterate over the list and get the sum of each group of three digits. Currently I am doing this: for i in range(0, len(nums), 3): nsum = a + b + c for a, b, c in nums[i, i+3] print(nsum) I know this is wrong, but is there a way to do this? I'm sure I've overlooked something probably very simple... But I can't think of another way to do this.

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• Diophantine Equation

  - by lakshmi

  Show that it is possible to buy exactly 50, 51, 52, 53, 54, and 55 McNuggets, by finding solutions to the Diophantine equation. You can solve this in your head, using paper and pencil, or writing a program. However you chose to solve this problem, list the combinations of 6, 9 and 20 packs of McNuggets you need to buy in order to get each of the exact amounts. Given that it is possible to buy sets of 50, 51, 52, 53, 54 or 55 McNuggets by combinations of 6, 9 and 20 packs, show that it is possible to buy 56, 57,..., 65 McNuggets. In other words, show how, given solutions for 50-55, one can derive solutions for 56-65.python

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• Ironpython call numpy problem

  - by Begtostudy

  Ironpython 2.6, python 2.6.5, numpy, SciPy import sys sys.path.append(r'D:\Python26\dll') sys.path.append(r'D:\Python26\Lib') sys.path.append(r'D:\Python26\Lib\site-packages') » import numpy Traceback (most recent call last): File "<string>", line 1, in <module> File "D:\Python26\Lib\site-packages\numpy\__init__.py", line 132, in <module> File "D:\Python26\Lib\site-packages\numpy\add_newdocs.py", line 9, in <module> File "D:\Python26\Lib\site-packages\numpy\lib\__init__.py", line 4, in <module> File "D:\Python26\Lib\site-packages\numpy\lib\type_check.py", line 8, in <module> File "D:\Python26\Lib\site-packages\numpy\core\__init__.py", line 5, in <module> ImportError: No module named multiarray What's wrong? Thanks.

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• Regex for [a-zA-Z0-9\-] with dashes allowed in between but not at the start or end

  - by orokusaki

  I'm using Python and I'm not trying to extract the value, but rather test to make sure it fits the pattern. allowed values: spam123-spam-eggs-eggs1 spam123-eggs123 spam 123 eggs123 I just can't have a dash at the starting or the end. There is a question on here that works in the opposite direction by getting the string value after the fact, but I simply need to test for the value so that I can disallow it. Also, it can be a maximum of 25 chars long, but a minimum of 4 chars long. Here's what I've come up with after some experimentation with lookbehind, etc: # Nothing here

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• How to decode Google spreadsheet's Json respose as a Php Array

  - by Mohammad

  My google Docs Spreadsheet call returns this response in the json format (I only need everything after "rows") please look at the formatted response here : ) I use php's json_decode function to parse the data and use it (Yes, I am awful at php) This code returns NULL, and according to the documentation, NULL is returned "if the json cannot be decoded". $json = file_get_contents($jsonurl); $json_output = json_decode($json); var_dump ($json_output); // Returns NULL Basically, what i want to accomplish is to make a simple array from the first row values of the Json response. like this $array = {'john','John Handcock','[email protected]','2929292','blanc'} You guys are genius, I would appreciate your insight and help on this very much! Answer as "sberry2A" mentions bellow, the response is not valid Json, google offers the Zend Json library for this purpose, tho I decided to parse the tsv-excel version instead :)

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• pycurl installation on Windows

  - by Vijayendra Bapte

  I am not able to install pycurl on Windows on Python2.6. Getting following error: C:\Documents and Settings\vijayendra\Desktop\Downloads\pycurl-7.19.0>python setup.py install --curl-dir="C:\Documents and Settings\vijayendra\Desktop\Downloads\ curl-7.19.5-win32-ssl\curl-7.19.5" Using curl directory: C:\Documents and Settings\vijayendra\Desktop\Downloads\curl-7.19.5-win32-ssl\curl-7.19.5 Traceback (most recent call last): File "setup.py", line 210, in <module> assert os.path.isfile(o), o AssertionError: C:\Documents and Settings\vijayendra\Desktop\Downloads\curl-7.19.5-win32-ssl\curl-7.19.5\lib\libcurl.lib Any idea what is this error about and how to fix this?

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• add methods in subclasses within the super class constructor

  - by deamon

  I want to add methods (more specifically: method aliases) automatically to Python subclasses. If the subclass defines a method named 'get' I want to add a method alias 'GET' to the dictionary of the subclass. To not repeat myself I'd like to define this modifation routine in the base class. But if I check in the base class init method, there is no such method, since it is defined in the subclass. It will become more clear with some source code: class Base: def __init__(self): if hasattr(self, "get"): setattr(self, "GET", self.get) class Sub(Base): def get(): pass print(dir(Sub)) Output: ['__doc__', '__init__', '__module__', 'get'] It should also contain 'GET'. Is there a way to do it within the base class?

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• CSS file pathing problem

  - by Alan Harris-Reid

  Hi there, When designing a HTML template in my favorite editor (TextPad at the moment) I can view my code in a browser by pressing F11 or the appropriate toolbar button. I have my common css rules in a separate file so my HTML contains the code: <link rel="stylesheet" href="commoncss.css" type="text/css"> This works when the .css file is in the same folder as the .html file, or if I fully path the .css file in the href property, eg. ///c:/mycssfolder/commoncss.css However, in a 'live' situation I want the .css file to reside in a common folder which is accessible from a number of .html files (eg. href='css/commoncss.css', where the css folder is configured at web-server level). How can I achieve this design vs. live dilemma without copying css file to all .html folders (and all the maintenance headaches that comes with it)? I am using Python 3.1 with Jinja2, but I guess this problem is applicable across any language and template-engine. Any help would be appreciated. Alan

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• Django ORM and multiprocessing

  - by Ankur Gupta

  Hi, I am using Django ORM in my python script in a decoupled fashion i.e. it's not running in context of a normal Django Project. I am also using the multi processing module. And different process in turn are making queries. The process ran successfully for an hr and exited with this message "IOError: [Errno 32] Broken pipe" Upon futhur diagnosis and debugging this error pops up when I call save() on the model instance. I am wondering Is Django ORM Process save ? Why would this error arise else ? Cheers Ankur

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• gethostname() returns accurate hostname, bind() doesn't like it

  - by user2072848

  Doing a python socket tutorial, entire codebase is as follows import socket as so s = so.socket() host = so.gethostname() port = 12345 s.bind((host, port)) s.listen(5) while True: c, addr = s.accept() print 'Got connection from', addr c.send('Thank you for connecting') c.close() and error message: Traceback (most recent call last): File "server.py", line 13, in <module> s.bind((host, port)) File "/Users/solid*name*/anaconda/lib/python2.7/socket.py", line 224, in meth return getattr(self._sock,name)(*args) socket.gaierror: [Errno 8] nodename nor servname provided, or not known Printing hostname gives me super*name* Which is, in fact, my computer's hostname.

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• Rails Gem Install Problems: Google-Geocode

  - by spin-docta

  I'm try to install google-geocode for rails sudo gem install google-geocode but I get the following error. Any suggestions? Building native extensions. This could take a while... ERROR: Error installing google-geocode: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb checking for iconv.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include/libxml2,/usr/include,/usr/include/libxml2... yes checking for libxml/parser.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include/libxml2,/usr/include,/usr/include/libxml2... yes checking for libxslt/xslt.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include/libxml2,/usr/include,/usr/include/libxml2... yes checking for libexslt/exslt.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include,/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include/libxml2,/usr/include,/usr/include/libxml2... yes checking for xmlParseDoc() in -lxml2... no libxml2 is missing. try 'port install libxml2' or 'yum install libxml2' *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby --with-iconv-dir --without-iconv-dir --with-iconv-include --without-iconv-include=${iconv-dir}/include --with-iconv-lib --without-iconv-lib=${iconv-dir}/lib --with-xml2-dir --without-xml2-dir --with-xml2-include --without-xml2-include=${xml2-dir}/include --with-xml2-lib --without-xml2-lib=${xml2-dir}/lib --with-xslt-dir --without-xslt-dir --with-xslt-include --without-xslt-include=${xslt-dir}/include --with-xslt-lib --without-xslt-lib=${xslt-dir}/lib --with-xml2lib --without-xml2lib Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/nokogiri-1.4.0 for inspection. Results logged to /Library/Ruby/Gems/1.8/gems/nokogiri-1.4.0/ext/nokogiri/gem_make.out

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• Jython project in Eclipse can't find the Jython library, but works in an identical project

  - by Rob Lourens

  I have two projects in Eclipse with Java and Python code, using Jython. Also I'm using PyDev. One project can import and use the xml module just fine, and the other gives the error ImportError: No module named xml. As far as I can tell, all the project properties are set identically. The working project was created from scratch and the other comes from code checked out of an svn repository and put into a new project. What could be the difference?

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• How can I make mock-0.6 return a sequence of values?

  - by Chris R

  I'm using the mock-0.6 library from http://www.voidspace.org.uk/python/mock/mock.html to mock out a framework for testing, and I want to have a mock method return a series of values, each time it's called. Right now, this is what I figured should work: def returnList(items): def sideEffect(*args, **kwargs): for item in items: yield item yield mock.DEFAULT return sideEffect mock = Mock(side_effect=returnList(aListOfValues)) values = mock() log.info("Got %s", values) And the log output is this: subsys: INFO: Got <generator object func at 0x1021db500> So, the side effect is returning the generator, not the next value, which seems wrong. Where am I getting this wrong?

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• Custom Sorting on Custom Field in Django

  - by RotaJota

  In my app, I have defined a custom field to represent a physical quantity using the quantities package. class AmountField(models.CharField): def __init__(self, *args, **kwargs): ... def to_python(self, value): create_quantities_value(value) Essentially the way it works is it extends CharField to store the value as a string in the database "12 min" and represents it as a quantities object when using the field in a model array(12) * min Then in a model it is used as such: class MyModel(models.Model): group = models.CharField() amount = AmountField() class Meta: ordering = ['group', 'amount'] My issue is that these fields do not seem to sort by the quantity, but instead by the string. So if I have some objects that contain something like {"group":"A", "amount":"12 min"} {"group":"A", "amount":"20 min"} {"group":"A", "amount":"2 min"} {"group":"B", "amount":"20 min"} {"group":"B", "amount":"1 hr"} they end up sorted something like this: >>> MyModel.objects.all() [{A, 12 min}, {A, 2 min}, {A, 20 min}, {B, 1 hr}, {B, 20 min}] essentially alphabetical order. Can I give my custom AmountField a comparison function so that it will compare by the python value instead of the DB value?

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• How can i bundle other files when using cx_freeze?

  - by Mridang Agarwalla

  I'm using Python 2.6 and cx_Freeze 4.1.2 on a Windows system. I've created the setup.py to build my executable and everything works fine. When cx_Freeze runs it movies everything to the build directory. I have some other files that i would like included in my build directory. How can i do this? Here's my structure. src\ setup.py janitor.py README.txt CHNAGELOG.txt helpers\ uncompress\ unRAR.exe unzip.exe Here's my snippet: setup ( name='Janitor', version='1.0', description='Janitor', author='John Doe', author_email='[email protected]', url='http://www.this-page-intentionally-left-blank.org/', data_files = [ ('helpers\uncompress', ['helpers\uncompress\unzip.exe']), ('helpers\uncompress', ['helpers\uncompress\unRAR.exe']), ('', ['README.txt']) ], executables = [ Executable\ ( 'janitor.py', #initScript ) ] ) I can't seem to get this to work. Do i need a MANIFEST.in file? Thank you.

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• don't understand pisa(xhtml2pdf) license

  - by sacabuche

  A client ask me to generate PDF in python, but i don't know if i have to pay the license or just use it. what do i have to do? In their web site said: XHTML2PDF is dual-licensed: 1. GNU General Public License Version 2.0 (GPLv2) 2. A commercial license In their docs: pisa is copyrighted by Dirk Holtwick, Germany. pisa is distributed by Dirk Holtwick, Schreiberstraße 2, 47058 Duisburg, Germany. pisa is licensed under the GNU Gerneral Public License version 2. thanks

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• Are there any existing batch log file aggregation solutions?

  - by Mohan Gulati

  I wish to export from multiple nodes log files (in my case apache access and error logs) and aggregate that data in batch, as a scheduled job. I have seen multiple solutions that work with streaming data (i.e think scribe). I would like a tool that gives me the flexibility to define the destination. This requirement comes from the fact that I want to use HDFS as the destination. I have not been able to find a tool that supports this in batch. Before re-creating the wheel I wanted to ask the StackOverflow community for their input. If a solution exists already in python that would be even better.

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• Inherit a parent class docstring as __doc__ attribute

  - by Reinout van Rees

  There is a question about Inherit docstrings in Python class inheritance, but the answers there deal with method docstrings. My question is how to inherit a docstring of a parent class as the __doc__ attribute. The usecase is that Django rest framework generates nice documentation in the html version of your API based on your view classes' docstrings. But when inheriting a base class (with a docstring) in a class without a docstring, the API doesn't show the docstring. It might very well be that sphinx and other tools do the right thing and handle the docstring inheritance for me, but django rest framework looks at the (empty) .__doc__ attribute. class ParentWithDocstring(object): """Parent docstring""" pass class SubClassWithoutDoctring(ParentWithDocstring): pass parent = ParentWithDocstring() print parent.__doc__ # Prints "Parent docstring". subclass = SubClassWithoutDoctring() print subclass.__doc__ # Prints "None" I've tried something like super(SubClassWithoutDocstring, self).__doc__, but that also only got me a None.

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• Freezing a dual-mode (GUI and console) application using cx_Freeze

  - by Mridang Agarwalla

  Hi, I've developed a Python application that runs both in the GUI mode and the console mode. If any arguments are specified, it runs in a console mode else it runs in the GUI mode. I've managed to freeze this using cx_Freeze. I had some problems hiding the black console window that would pop up with wxPython and so I modified my setup.py script like this: import sys from cx_Freeze import setup, Executable base = None if sys.platform == "win32": base = "Win32GUI" setup( name = "simple_PyQt4", version = "0.1", description = "Sample cx_Freeze PyQt4 script", executables = [Executable("PyQt4app.py", base = base)]) This works fine but now when I try to open up my console and run the executable from there, it doesn't output anything. I don't get any errors or messages so it seems that cx_Feeze is redirecting the stdout somewhere else. Is is possible to get it to work with both mode? Nothing similar to this seems to be documented anywhere. :( Thanks in advance. Mridang

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• How to log in to a website using installed twill?

  - by brilliant

  Hello, everybody!!!! I have just successfully installed TWILL on my computer with the help of one very supportive member of "StackOverflow" (you can check it out HERE) and have tried to run one of the simple examples on the twill documentation page (you can see that page HERE). Here is that example: Let's say my username on www.slash.org is lynxye and my password is mammal. When I try to enter that example code into my Python prompt, I can only type and enter the first line of the code because when I click on "Enter" to start a new line, I get some error messages right away: The same happens when I try to enter this code into my terminal: I think I miss out on some basics here. Perhaps, I need to create a file that would contain that code and then run that file somehow, but I really don't know where I need to create that file and with what extensdion. Can anyone, please, help me with this?

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• Why does "enable-shared failed" happen on libjpeg build for os X?

  - by BryanWheelock

  I'm trying to install libjpeg on os X to fix a problem with the Python Imaging Library JPEG setup. I downloaded libjpeg from http://www.ijg.org/files/jpegsrc.v7.tar.gz I then began to setup the config file cp /usr/share/libtool/config.sub . cp /usr/share/libtool/config.guess . ./configure –enable-shared However, the enable-shared flag didn't seem to work. $ ./configure –-enable-shared configure: WARNING: you should use --build, --host, --target configure: WARNING: invalid host type: –-enable-shared checking build system type... Invalid configuration `–-enable-shared': machine `–-enable' not recognized configure: error: /bin/sh ./config.sub –-enable-shared failed I've done lot's of google searches and I can't figure out where the error is or how to work around this error.

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• Trouble using eval() with cython

  - by Peter Stewart

  I was trying to speed up some code, and then I tried compiling a class and a function using cython and WOW! I havn't measured it yet but it looks at least 10x faster. I first looked at cython just two days ago, I'm very impressed! However, I can't get eval() to work. def thefirst(int a): d = eval('1+2+a') return d I compile this to module1.pyd file and call it with the python file: from module1 import thefirst x = thefirst(2) print x This returns: NameError: name 'a' is not defined. All help is appreciated.

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• realtime collaborative editing: mobwrite on windows7 x64

  - by collabwriter

  I have set up Mobwrite on my Win7 development machine using the daemon and q.py listener. The client test suite passes, but when I run the server test suite, everything fails with this sort of response: Question: U:user10259538167863824 f:0:unittest10259538167863824 R:0:Hello world Expected: u:user10259538167863824 F:0:unittest10259538167863824 D:0:=11 Actual: u:user10259538167863824 F:0:unittest10259538167863824 D:0:=11 Diff: u:user10259538167863824 ¶ F:0:unittest10259538167863824 ¶ D:0:=11¶ ¶ ¶ I am assuming it has something to do with line endings, but I don't know what to do. Can anyone shed some light on this? Thanks so much! PS: I'm running Python 2.7

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