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  • So, I guess I can't use "&&" in the Python if conditional. What should I use in this case? Any help?

    - by Sergio Tapia
    Here's my code: # F. front_back # Consider dividing a string into two halves. # If the length is even, the front and back halves are the same length. # If the length is odd, we'll say that the extra char goes in the front half. # e.g. 'abcde', the front half is 'abc', the back half 'de'. # Given 2 strings, a and b, return a string of the form # a-front + b-front + a-back + b-back def front_back(a, b): # +++your code here+++ if len(a) % 2 == 0 && len(b) % 2 == 0: return a[:(len(a)/2)] + b[:(len(b)/2)] + a[(len(a)/2):] + b[(len(b)/2):] else: #todo! Not yet done. :P return I'm getting an error in the IF conditional. What am I doing wrong? Edit: I meant no arrogance here. Someone edited my question title to make it sound douchy. I was genuinely confused about what to use, didn't think 'and' would be a keyword. Please don't downvote as other newbies might be confused about it as well.

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  • Python: How can I read in the characters from a line in a file and convert them to floats and strs, depending on if they are numbers or letters?

    - by user1467577
    I have a file that looks like: 1 1 C C 1.9873 2.347 3.88776 1 2 C Si 4.887 9.009 1.21 I would like to read in the contents of the file, line-by-line. When I only had numbers on the lines I used: for line in readlines(file): data = map(float, line.split) But this only works when all the elements of line.split are numbers. How can I make it store the letters as strings and the numbers as floats?

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  • The problem with installing PIL using virtualenv or buildout.

    - by Alexander Artemenko
    When I install PIL using easy_install or buildout it installs in such way, that I must do 'import Image', not 'from PIL import Image'. However, if I do "apt-get install python-imaging" or use "pip -E test_pil install PIL", all work fine. Here are examples of how I trying to install PIL using virtualenv: # virtualenv --no-site-packages test_pil # test_pil/bin/easy_install PIL # test_pil/bin/python Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12) [GCC 4.0.1 (Apple Inc. build 5465)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import PIL Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named PIL I see, that easy_install pack PIL into the Egg, and PIP does not. Same thing with buildbot, it uses eggs. How could I install PIL properly, using easy_install or buildout?

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  • How to install wexpect?

    - by Justine
    Hello, I'm running 32-bit Windows XP and trying to have Matlab communicate with Cgate, a command line program. I'd like to make this happen using wexpect, which is a port of Python's module pexpect to Windows. I'm having trouble installing or importing wexpect though. I've put wexpect in the folder Lib, along with all other modules. I can import those other modules but just not wexpect. Commands I've tried include: import wexpect import wexpect.py python wexpect.py install python wexpect.py install --home=~ wexpect install Does anyone have anymore ideas?

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  • Jython 2.5.1: "ImportError: No Module named os"

    - by Leonidas
    I looked through the other posts and bug reports and couldn't figure out what's causing this. I'm using Jython 2.5.1, in a Java project in Eclipse (Ubuntu 8.10). It has been added to the project as a standalone .jar file (I just replaced the old Jython 2.1 jar with this one). I'm running a script that uses the threading.py class. At some point the statement "import os" is evaluated from linecache.py and I get this error, which I can't seem to figure out how to fix: 'Execution failed. Traceback (most recent call last): File "<string>", line 1, in <module> File "../lib/python/threading.py", line 6, in <module> import traceback File "../lib/python/traceback.py", line 3, in <module> import linecache File "../lib/python/linecache.py", line 9, in <module> import os ImportError: No module named os'

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  • Unable to run winpdb

    - by hekevintran
    I tried to run winpdb.py, but I got an error saying that it could not find wxPython. This is strange to me because I know I have wxPython installed and included in my PYTHONPATH. I can import wx in the Python interpreter. Mac OS X 10.5.8 Python 2.6 PYTHONPATH=/sw/lib/python2.6/site-packages/:/usr/local/lib/wxPython-unicode-2.8.10.1/lib/python2.6/site-packages/wx-2.8-mac-unicode: $ python winpdb.py wxPython was not found. wxPython 2.6 or higher is required to run the winpdb GUI. wxPython is the graphical user interface toolkit used by Winpdb. You can find more information on wxPython at http://www.wxpython.org/ The Unicode version of wxPython is recommended for Winpdb. To use the debugger without a GUI, run rpdb2. What could be causing this?

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  • AttributeError while adding colorbar in matplotlib

    - by bgbg
    The following code fails to run on Python 2.5.4: from matplotlib import pylab as pl import numpy as np data = np.random.rand(6,6) fig = pl.figure(1) fig.clf() ax = fig.add_subplot(1,1,1) ax.imshow(data, interpolation='nearest', vmin=0.5, vmax=0.99) pl.colorbar() pl.show() The error message is C:\temp>python z.py Traceback (most recent call last): File "z.py", line 10, in <module> pl.colorbar() File "C:\Python25\lib\site-packages\matplotlib\pyplot.py", line 1369, in colorbar ret = gcf().colorbar(mappable, cax = cax, ax=ax, **kw) File "C:\Python25\lib\site-packages\matplotlib\figure.py", line 1046, in colorbar cb = cbar.Colorbar(cax, mappable, **kw) File "C:\Python25\lib\site-packages\matplotlib\colorbar.py", line 622, in __init__ mappable.autoscale_None() # Ensure mappable.norm.vmin, vmax AttributeError: 'NoneType' object has no attribute 'autoscale_None' How can I add colorbar to this code? Following is the interpreter information: Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>>

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  • Could somebody give me a high-level technical overview of WSGI details behind the scenes vs other we

    - by orokusaki
    Firstly: I understand what WSGI is and how to use it I understand what "other" methods (Apache mod-python, fcgi, et al) are, and how to use them I understand their practical differences What I don't understand is how each of the various "other" methods work compared to something like UWSGI, behind the scenes. Does your server (Nginx, etc) route the request to your WSGI application and UWSGI creates a new Python interpreter for each request routed to it? How much different is is from the other more traditional / monkey patched methods is WSGI (aside from the different, easier Python interface that WSGI offers)? What light bulb moment am I missing?

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  • PyPy -- How can it possible beat CPython?

    - by Vulcan Eager
    From the Google Open Source Blog: PyPy is a reimplementation of Python in Python, using advanced techniques to try to attain better performance than CPython. Many years of hard work have finally paid off. Our speed results often beat CPython, ranging from being slightly slower, to speedups of up to 2x on real application code, to speedups of up to 10x on small benchmarks. How is this possible? Which Python implementation was used to implement PyPy? CPython? And what are the chances of a PyPyPy or PyPyPyPy beating their score? (On a related note... why would anyone try something like this?)

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  • Is there any use for Bash scripting anymore?

    - by Precision
    I just finished my second year as a university CS student, so my "real-world" knowledge is lacking. I learned Java my first year, continued with Java and picked up C and simple Bash scripting my second. This summer I'm trying to learn Perl (God help me). I've dabbled with Python a bit in the past. My question is, now that we have very readable, very writable scripting languages like Python, Ruby, Perl, etc, why does anyone write Bash scripts? Is there something I'm missing? I know my linux box has perl and python. Are they not ubiquitous enough? Is there really something that's easier to do in Bash than in some other hll?

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  • Having py2exe include my data files (like include_package_data)

    - by cool-RR
    I have a Python app which includes non-Python data files in some of its subpackages. I've been using the include_package_data option in my setup.py to include all these files automatically when making distributions. It works well. Now I'm starting to use py2exe. I expected it to see that I have include_package_data=True and to include all the files. But it doesn't. It puts only my Python files in the library.zip, so my app doesn't work. How do I make py2exe include my data files?

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  • ctypes and PySide

    - by Timothy Baldridge
    I'm building an app with PySide, there's some image manipulation that needs to be done and using Python code for this is way too slow. Therefore I hacked out a .dll file that will do it for me. The function definition is as follows: extern "C" { QRectF get_image_slant(QImage *img, float slantangle, float offset) { Now I can load this function in via ctypes. But I can't seem to get ctypes to accept a QImage. I tried calling it like this: ext.get_image_slant(QImage(), 0, 0) And the reply I get is: File "<stdin>", line 1, in <module> ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>: Don't know how to convert parameter 1 I tired casting the QImage to a c_void_p and it doesn't like that either. From what I can tell QImage() in python should map exactly to a QImage * in C, but Python doesn't seem to understand that.. Is there any way to force the casting?

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  • Client side html markdown conversion

    - by DNN
    Hello, I've been trying to create a client side editor which allows the end user to create content in html or markdown. The user has two tabs for switching between the two. I managed to find some javascript that converts markdown to html, so if a user has been writing markdown and switches to the html tab, the html equivilant is shown. I haven't been able to find a javascript that converts html to markdown, only a python script. The python script is obviously server side. The tabs are just hyperlinks with script in there. Is there any way I can convert the markdown html when the user clicks the tab? The system has been created in python/django for reference Thanks

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  • Compiling and installing pyactivemq on osx

    - by muanis
    I'm having a hardtime trying to install pyactivemq (link) on my osx leopard. Following a tutorial (in portuguese) on compiling it ends up ok, but when I run the tests i receive only a crypt message: "Fatal Python error: Interpreter not initialized (version mismatch?)" There is not much information on the web about using pyactivemq on osx, but what I could find is that is something related to wrong linking when boost compiles. I'm running: Mac OS 10.5.8 MacPorts 1.8.2 APR 1.3.9 Xcode 3.1.4 Boost 1.41.0 (installing for python 2.5) Activemq-cpp 2.2.6 pyactivemq 0.1.0 If someone has any info on this it would be helpful

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  • QPluginLoader with PyQt modules as plugins: possible?

    - by Thorfin
    Hi! I have a C++ application that loads externals plugins thanks to QPluginloader. QPluginLoader provides access to a Qt plugin. A Qt plugin is stored in a shared library (a DLL). The plugins have to inherit from a pure virtual class ( and Q_DECLARE_INTERFACE ) and QObject. I would like to create plugins by using python and PyQt. Is this possible without too much work? For instance if I have to convert the modules to C++ with boost::python, this could be nonsense, as PyQt is already a conversion from C++ to Python... Thanks!

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  • Look of the app - Py2exe / wxPython

    - by Francisco Aleixo
    So my problem is the look and feel from my application, as it looks like an old look app. It is an wxPython application, and on python it runs fine and looks fine, but when I convert it to .exe using py2exe, the look is just bad. Now I know that if you are using XP you need some manifest to correct it but I am in other circumstances. I'm using Windows 7, and I'm using Python 2.6 (Yes, I am including the DLL's and the Microsoft.VC90.CRT.manifest). So my question is how can I solve this under these circumstances? NOTE: I tried to search on google, but the posts I found were rather old with people using XP and older python versions so I assumed it would be different? EDIT: Screenshots Normal (wanted look) : http://img80.imageshack.us/img80/3157/70762988.png Py2exe (unwanted look) : http://img687.imageshack.us/img687/6581/53608742.jpg

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  • Windows 7 Task Scheduler

    - by Btibert3
    Hi All, Very new to this, and I have no idea where to start. I want to schedule a python script using Task Scheduler in Windows 7. When I add a "New Action", I place the following command as the script/program : c:\python25\python.exe As the argument, I add the full path to the location of my python script path\script.py Here is my script: import datetime import csv import os now = datetime.datetime.now() print str(now) os.chdir('C:/Users/Brock/Desktop/') print os.getcwd() writer = csv.writer(open("test task.csv", "wb")) row = ('This is a test', str(now)) writer.writerow(row) I got an error saying the script could not run. Any help you can provide to get me up and running will be very much appreciated! Thanks, Brock

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  • Which revision of html5lib is stable?

    - by Mat
    html5lib notes that it's latest release (0.11) is somewhat old. Using the Python portion, I have recursion problems as noted in Issue 70 and Issue 59 but can't find a recent Mercurial revision that is stable. The latest tip is no good, I got the following error from python setup.py install: byte-compiling build/bdist.linux-x86_64/egg/html5lib/treewalkers/_base.py to _base.pyc File "build/bdist.linux-x86_64/egg/html5lib/treewalkers/_base.py", line 40 "data": []} ^ SyntaxError: invalid syntax And I get the following errors at runtime: soup = parser.parse(page.read()) File "build/bdist.linux-x86_64/egg/html5lib/html5parser.py", line 165, in parse File "build/bdist.linux-x86_64/egg/html5lib/html5parser.py", line 144, in _parse File "build/bdist.linux-x86_64/egg/html5lib/html5parser.py", line 454, in processDoctype TypeError: insertDoctype() takes exactly 4 arguments (2 given) I'm using it on Python 2.5.2 with lxml and BeautifulSoup.

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  • OpenType programming

    - by Sorush Rabiee
    Hi all Recently i asked two questions (1 and 2) about using OpenType features in programs written by python and .net languages, but didn't get an answer. i realized there is no way to change text rendering engines of operating systems, or force them to use OpenType. so now want to implement my own. such a program that: provides a text engine that receives glyph shapes from otf and ttf files and renders them in sequence of glyphs in text. generates all of OTL features can be used in other parts of applications like controls and components of .NET or python GUI libraries. if python and .net languages are not suitable in this situation, aware me about other programming languages or tools. comments and answers about text rendering system of common Operating Systems, or designing text engines compatible with unicode 5.02 protocol are welcomed.

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  • large amount of data in many text files - how to process?

    - by Stephen
    Hi, I have large amounts of data (a few terabytes) and accumulating... They are contained in many tab-delimited flat text files (each about 30MB). Most of the task involves reading the data and aggregating (summing/averaging + additional transformations) over observations/rows based on a series of predicate statements, and then saving the output as text, HDF5, or SQLite files, etc. I normally use R for such tasks but I fear this may be a bit large. Some candidate solutions are to 1) write the whole thing in C (or Fortran) 2) import the files (tables) into a relational database directly and then pull off chunks in R or Python (some of the transformations are not amenable for pure SQL solutions) 3) write the whole thing in Python Would (3) be a bad idea? I know you can wrap C routines in Python but in this case since there isn't anything computationally prohibitive (e.g., optimization routines that require many iterative calculations), I think I/O may be as much of a bottleneck as the computation itself. Do you have any recommendations on further considerations or suggestions? Thanks

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  • begin...end VS braces {...} VS indentation grouping

    - by Halst
    Hi, everyone. I don't want to fuel any holy-wars here, but I need to ask your opinion. Right now I'm in process of designing a Hardware Description Language as a project in my university. I decided to take VHDL language and just add some syntax-sugar 'coz VHDL is rather obese in syntax. I decided to use indentation to group blocks of code (like in Python), and I'm strongly criticized for that. Originally Begin...End; grouping is used in VHDL language. I have no clue what are cons and pros of these 3 types of grouping, the only thing I know is that I like Python style and I don't understand if it's usage could be erroneous or something? What do you think? What do you like? (hope that I can get some feedback from people who extensively used different languages with different code-grouping syntax, like Pasca, Ada, Delphi, C, C++, C#, Java, Python)

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  • Django ValueError at /admin/

    - by mjaz
    Hello, I am running Django with mod_python on a Red Hat Linux box in production. A little while ago, for a reason unknown to me, the admin stopped working, throwing a 500 error. The error is as follows: ValueError at /admin/ Empty module name Request Method: GET Exception Type: ValueError Exception Value: Empty module name Exception Location: /usr/local/lib/python2.6/site-packages/django/utils/importlib.py in import_module, line 35 Python Executable: /usr/bin/python Python Version: 2.6.2 Has anyone encountered this before? I have absolutely no idea how to fix this problem. Thank you for any help.

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  • Unable to run OpenMPI across more than two machines

    - by rcollyer
    When attempting to run the first example in the boost::mpi tutorial, I was unable to run across more than two machines. Specifically, this seemed to run fine: mpirun -hostfile hostnames -np 4 boost1 with each hostname in hostnames as <node_name> slots=2 max_slots=2. But, when I increase the number of processes to 5, it just hangs. I have decreased the number of slots/max_slots to 1 with the same result when I exceed 2 machines. On the nodes, this shows up in the job list: <user> Ss orted --daemonize -mca ess env -mca orte_ess_jobid 388497408 \ -mca orte_ess_vpid 2 -mca orte_ess_num_procs 3 -hnp-uri \ 388497408.0;tcp://<node_ip>:48823 Additionally, when I kill it, I get this message: node2- daemon did not report back when launched node3- daemon did not report back when launched The cluster is set up with the mpi and boost libs accessible on an NFS mounted drive. Am I running into a deadlock with NFS? Or, is something else going on?

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  • stumped by WSGI module import errors

    - by rguha
    Hi, I'm writing a bare bones Python wsgi application and am getting stumped by module import errors. I have a .py file in the current directory which initially failed to import. By adding sys.path.insert(0, '/Users/guhar/Sites/acom') the import of the module worked. But I now try and import a module that I had installed via easy_install and it fails to import. I tried setting sys.path.insert(0, '/Library/Python/2.5/site-packages/') which contains the egg file, but to no avail. I would've thought that all packages under "/Library/Python/2.5/site-packages/" would be available to a WSGI application. Does anybody have any pointers?

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