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  • Linker problem linking boost in Visual Studio 2008

    - by Tobias Langner
    Hi, I have a rather obscure linking problem in Visual Studio 2008. The linker error message is: "LNK1104: cannot open file 'boost_thread-vc90-mt-gd-1_38.lib'". All pathes and dependencies are set. What I noticed though is that Visual Studio misses boost_thread-vc90-mt-gd-1_38.lib and not libboost_thread-vc90-mt-gd-1_38.lib (notice the lib at the beginning of the file name). I added the .lib as libboost_thread-vc90-mt-gd-1_38.lib to the project and it appears as libboost_thread-vc90-mt-gd-1_38.lib in the command line. Why does Visual Studio the beginning of the file name?

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  • Unable to build mercurial on OSX - Python.h not found

    - by Oscar Reyes
    For what I've read I need Python-Dev, how do I install it on OSX? I think the problem I have, is, my Xcode was not properly installed, and I don't have the paths where I should. This previous question: http://stackoverflow.com/questions/2685887/where-is-gcc-on-osx-i-have-installed-xcode-already Was about I couldn't find gcc, now I can't find Python.h Should I just link my /Developer directory to somewhere else in /usr/ ??? This is my output: $ sudo easy_install mercurial Password: Searching for mercurial Reading http://pypi.python.org/simple/mercurial/ Reading http://www.selenic.com/mercurial Best match: mercurial 1.5.1 Downloading http://mercurial.selenic.com/release/mercurial-1.5.1.tar.gz Processing mercurial-1.5.1.tar.gz Running mercurial-1.5.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-_7RaTq/mercurial-1.5.1/egg-dist-tmp-l7JP3u mercurial/base85.c:12:20: error: Python.h: No such file or directory ... Thanks in advance.

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  • What is the python "with" statement designed for?

    - by fmark
    I came across the Python with statement for the first time today. I've been using Python lightly for several months and didn't even of its existence! Given its somewhat obscure status, I thought it would be worth asking: What is the Python with statement designed to be used for? What do you use it for? Are their any gotchas I need to be aware of, or common anti-patterns associated with its use?

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  • Python ldap AttributeError

    - by jenny
    Hi guys, I have an python error AttributeError: 'module' object has no attribute 'initialize' I am running Python 2.6.2 on Solaris 10 UNIX and recently installed the pythonldap 2.3.9. The script is very basic, only has these 2 lines. Can anyone tell me why?? Traceback error below. #!/usr/local/bin/python import ldap, sys con = ldap.initialize('ldap://localhost') Traceback (most recent call last): File "./myldap.py", line 5, in con = ldap.initialize('ldap://localhost') AttributeError: 'module' object has no attribute 'initialize' Regards, Jenny

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  • Python objects as userdata in ctypes callback functions

    - by flight
    The C function myfunc operates on a larger chunk of data. The results are returned in chunks to a callback function: int myfunc(const char *data, int (*callback)(char *result, void *userdata), void *userdata); Using ctypes, it's no big deal to call myfunc from Python code, and to have the results being returned to a Python callback function. This callback work fine. myfunc = mylib.myfunc myfunc.restype = c_int myfuncFUNCTYPE = CFUNCTYPE(STRING, c_void_p) myfunc.argtypes = [POINTER(c_char), callbackFUNCTYPE, c_void_p] def mycb(result, userdata): print result return True input="A large chunk of data." myfunc(input, myfuncFUNCTYPE(mycb), 0) But, is there any way to give a Python object (say a list) as userdata to the callback function? In order to store away the result chunks, I'd like to do e.g.: def mycb(result, userdata): userdata.append(result) userdata=[] But I have no idea how to cast the Python list to a c_void_p, so that it can be used in the call to myfunc. My current workaround is to implement a linked list as a ctypes structure, which is quite cumbersome.

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  • Python, SWIG and other strange things

    - by wanderameise
    hey, I have a firmware for an USB module I can already control by visual C. Now I want to port this to python. for this I need the octopus library which is written in c. I found a file called octopus_wrap which was created by SWIG! then I found a makefile which says: python2.5: swig -python -outdir ./ ../octopus.i gcc -fPIC -c ../../liboctopus/src/octopus.c gcc -fPIC -c ../octopus_wrap.c -I /usr/include/python2.5 gcc -fPIC -shared octopus_wrap.o octopus.o /usr/lib/libusb.so -o _octopus.so python2.4: swig -python -outdir ./ ../octopus.i gcc -fPIC -c ../../liboctopus/src/octopus.c gcc -fPIC -c ../octopus_wrap.c -I /usr/include/python2.4 gcc -fPIC -shared octopus_wrap.o octopus.o /usr/lib/libusb.so -o _octopus.so win: gcc -fPIC -c ../../liboctopus/src/octopus.c -I /c/Programme/libusb-win32-device-bin-0.1.10.1/include gcc -fPIC -c octopus_wrap.c -I /c/Python25/libs -lpython25 -I/c/Python25/include -I /c/Programme/libusb-win32-device-bin-0.1.10.1/include gcc -fPIC -shared *.o -o _octopus.pyd -L/c/Python25/libs -lpython25 -lusb -L/c/Programme/libusb-win32-device-bin-0.1.10.1/lib/gcc clean: rm -f octopus* _octopus* install_python2.4: cp _octopus.so /usr/local/lib/python2.4/site-packages/ cp octopus.py /usr/local/lib/python2.4/site-packages/ install_python2.5: cp _octopus.so /usr/local/lib/python2.5/site-packages/ cp octopus.py /usr/local/lib/python2.5/site-packages/ I dont know how to handle this but as far as I can see octopus.py and _octopus.so are the resulting output files which are relevant to python right? luckily someone already did that and so I put those 2 files to my "python26/lib" folder (hope it doesnt matter if it´s python 2.5 or 2.6?!) So when working with the USB device the octopus.py is the library to work with! Importing this file makes several problems: >>> Traceback (most recent call last): File "C:\Users\ameise\My Dropbox\µC\AVR\OCTOPUS\octopususb-0.5\demos\python \blink_status.py", line 8, in <module> from octopus import * File "C:\Python26\lib\octopus.py", line 7, in <module> import _octopus ImportError: DLL load failed: module not found. and here´s the related line 7 : import _octopus So there´s a problem considering the .so file! What could be my next step? I know that´s a lot of confusing stuff but I hope anyone of you could bring some light in my mind! thy in advance

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  • Python questions from beginner

    - by ChrisC
    I'm thinking about rewriting an MS Access db I wrote years ago into a stand-alone Python app. Other than a college class called "Intro to C++" (console only, with OOP concepts) and the Access db itself, I have no experience, so I need to ask if the basis for my decision to go with Python is correct. Is it true that: 1) Python is relatively easy to pick up? 2) Python apps can run as "portable" (ie from one directory, no registry needs, nothing needs to be pre-installed on a Windows PC) as long as I use an embedded db?

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  • Does REGEX differ from PHP to Python

    - by daemonfire300
    hi there, I found this post: http://stackoverflow.com/questions/118143/python-regex-vs-php-regex but I actually did not get if Python's REGEX syntax matches PHP's REGEX syntax. I started to convert some of my old PHP code to python (due to g's appengine etc.), and now I would like to know whether the regex is 100% convertable, by simple copy & paste. regards,

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  • Using JRuby/Jython for Ruby/Python interoperability?

    - by dbr
    Quite-probably a silly question, as I don't know much about Java/Jython/JRuby/bytecode, but.. I stumbled across _why's unholy again today.. It allows you to output Python bytecode from Ruby code.. Basically allowing them to produce the same bytecode.. Jython outputs Java bytecode, as does JRuby.. Since these both compile to the same bytecode, does this mean you could potentially use any Python library from Ruby, and Ruby libraries from Python?

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  • Calling Perl and/or Python from Ruby

    - by Yktula
    Would it be possible to integrate Python (and/or Perl) and Ruby with some degree of transparency? I've looked at http://www.goto.info.waseda.ac.jp/~fukusima/ruby/python/doc/ and http://code.google.com/p/ruby-perl/ , but they both seem rather outdated. Perhaps this is not an appropriate approach, but would it be possible to generate a Ruby interface for Python's C API?

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  • Function parameter types in Python

    - by Leif Andersen
    Unless I'm mistaken, creating a function in python works like this def my_func(param1, param2): /*stuff*/ However, you don't actually give the types of those parameters. Also, if I remember, python is a strongly typed language, as such, it seams like python shouldn't let you pass in a parameter of a different type then the function creator expected. However, how does python know that the user of the function is passing in the proper types? Or will the program just die if it's the wrong type, assuming the function actually uses the parameter? Or do you have to specify the type/I'm missing something? Thank you.

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  • Python Random Question

    - by coson
    Good Day, I am using Python 2.6 and am trying to run a simple random number generator program (random.py): import random for i in range(5): # random float: 0.0 <= number < 1.0 print random.random(), # random float: 10 <= number < 20 print random.uniform(10, 20), # random integer: 100 <= number <= 1000 print random.randint(100, 1000), # random integer: even numbers in 100 <= number < 1000 print random.randrange(100, 1000, 2) I'm now receiving the following error: C:\Users\Developer\Documents\PythonDemo>python random.py Traceback (most recent call last): File "random.py", line 3, in <module> import random File "C:\Users\Developer\Documents\PythonDemo\random.py", line 8, in <module> print random.random(), TypeError: 'module' object is not callable C:\Users\Developer\Documents\PythonDemo> I've looked at the Python docs and this version of Python supports random. Is there something else I'm missing? TIA, coson

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  • Using Python for a Wacom tablet on Mac & Linux

    - by DamonJW
    I am shortly going to buy a Wacom Bamboo Pen&Touch, and I'd like to be able to access it from Python, preferably using PyQt. I've found a Python module for accessing it under windows (cgkit/wintab) and I've seen Python code for accessing it using GTK (GnomeTabletApps). Is there an equivalent for Mac? The Cocoa documentation provided by Wacom is way beyond me.

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  • Does python's httplib.HTTPConnection block?

    - by python_noob
    Hello, I am unsure whether or not the following code is a blocking operation in python: import httplib import urllib def do_request(server, port, timeout, remote_url): conn = httplib.HTTPConnection(server, port, timeout=timeout) conn.request("POST", remote_url, urllib.urlencode(query_dictionary, True)) conn.close() return True do_request("http://www.example.org", 80, 30, "foo/bar") print "hi!" And if it is, how would one go about creating a non-blocking asynchronous http request in python? Thanks from a python noob.

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  • How do i start learn python for web

    - by srisar
    Hi, I am learning python for a while, now I like to learn python for web, using python as a back-end of website. where and how do I start learning this: Example usages are : connecting database and retrieve and store information from forms

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  • zen of Python vs with statement - philosophical pondering

    - by NeuronQ
    I don't intend to simply waste your time, but: has it occurred to you too, while using Python's with statement that it really is contrary to the 5th line of "The Zen of Python" that goes "Flat is better than nested"? Can any enlightened Python guru share me some of their insights on this? (I always find that one more level of indentation pops up in my code every time I use with instead of f.close()... and it's not like I'm not gonna use try: ... finally: ... anyways and thus the benefits of with still elude me, even as I grow to like and understand Python more and more...)

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  • python protobufs - avoid the install step ?

    - by orion elenzil
    i'm writing a small python utility which will be consumed by moderately non-technical users and which needs to interface w/ some protobufs. ideally, i would like the only prerequisites to using this on a local machine to be: have python installed * have an SVN checkout of the repository * run a simple bash script to build the local proto .py definitions * run "python myutility" i'm running into trouble around importing descriptor_pb2.py, tho. i've seen Why do I see "cannot import name descriptor_pb2" error when using Google Protocol Buffers? , but would like to avoid adding the additional prerequisite of having run the proto SDK installer. i've modified the bash script to also generate descriptor_pb2.py in the local heirarchy, which works for the first level of imports from my other _pb2.py files, but it looks like descriptor_pb2.py itself tries to import descriptor_pb2 can't find it: $ python myutility.py Traceback (most recent call last): File "myutility.py", line 4, in <module> import protos.myProto_pb2 File "/myPath/protos/myProto_pb2.py", line 8, in <module> from google.protobuf import descriptor_pb2 File "/myPath/google/protobuf/descriptor_pb2.py", line 8, in <module> from google.protobuf import descriptor_pb2 ImportError: cannot import name descriptor_pb2 my local folder looks like: * myutility.py * google/ * protobuf/ * descriptor.py * descriptor_pb2.py * protos * myProto_ob2.py also, i'm a python n00b, so it's possible i'm overlooking something obvious. tia, orion

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  • Connecting to Python XML RPC from the Mac

    - by MAC
    Hi, I wrote an XML RPC server in python and a simple Test Client for it in python. The Server runs on a linux box. I tested it by running the python client on the same linux machine and it works. I then tried to run the python client on a Mac and i get the following error socket.error: (61, 'Connection Refused') I can ping and ssh into the linux machine from the Mac. So i dont think its a configuration or firewall error. Does anyone have any idea what could be going wrong? The code for the client is as below: import xmlrpclib s = xmlrpclib.ServerProxy('http://143.252.249.141:8000') print s.GetUsers() print s.system.listMethods()

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  • boost ublas: rotate 2d vector

    - by AndreasT
    Erm. I hope I am seriously overlooking something. I want to rotate a 2d vector (kartesian) v by a certain angle phi. I can't find a function that generates the appropriate matrix or just performs that function. I know how to do this by hand. I am looking for a ublas utility "something" that does this for me.

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  • Crazy python behaviour

    - by Martin
    I have a little piece of python code in the server script for my website which looks a little bit like this: console.append([str(x) for x in data]) console.append(str(max(data))) quite simple, you might think, however the result it's outputting is this: ['3', '12', '3'] 3 for some reason python thinks 3 is the max of [3,12,3]! So am I doing something wrong? Or this is misbehaviour on the part of python?

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  • What is the best python module skeleton code?

    - by user213060
    == Subjective Question Warning == Looking for well supported opinions or supporting evidence. Let us assume that skeleton code can be good. If you disagree with the very concept of module skeleton code then fine, but please refrain from repeating that opinion here. Many python IDE's will start you with a template like: print 'hello world' That's not enough... So here's my skeleton code to get this question started: My Module Skeleton, Short Version: #!/usr/bin/env python """ Module Docstring """ # ## Code goes here. # def test(): """Testing Docstring""" pass if __name__=='__main__': test() and, My Module Skeleton, Long Version: #!/usr/bin/env python # -*- coding: ascii -*- """ Module Docstring Docstrings: http://www.python.org/dev/peps/pep-0257/ """ __author__ = 'Joe Author ([email protected])' __copyright__ = 'Copyright (c) 2009-2010 Joe Author' __license__ = 'New-style BSD' __vcs_id__ = '$Id$' __version__ = '1.2.3' #Versioning: http://www.python.org/dev/peps/pep-0386/ # ## Code goes here. # def test(): """ Testing Docstring""" pass if __name__=='__main__': test() Notes: """ ===MODULE TYPE=== Since the vast majority of my modules are "library" types, I have constructed this example skeleton as such. For modules that act as the main entry for running the full application, you would make changes such as running a main() function instead of the test() function in __main__. ===VERSIONING=== The following practice, specified in PEP8, no longer makes sense: __version__ = '$Revision: 1.2.3 $' for two reasons: (1) Distributed version control systems make it neccessary to include more than just a revision number. E.g. author name and revision number. (2) It's a revision number not a version number. Instead, the __vcs_id__ variable is being adopted. This expands to, for example: __vcs_id__ = '$Id: example.py,v 1.1.1.1 2001/07/21 22:14:04 goodger Exp $' ===VCS DATE=== Likewise, the date variable has been removed: __date__ = '$Date: 2009/01/02 20:19:18 $' ===CHARACTER ENCODING=== If the coding is explicitly specified, then it should be set to the default setting of ascii. This can be modified if necessary (rarely in practice). Defaulting to utf-8 can cause anomalies with editors that have poor unicode support. """ There are a lot of PEPs that put forward coding style recommendations. Am I missing any important best practices? What is the best python module skeleton code? Update Show me any kind of "best" that you prefer. Tell us what metrics you used to qualify "best".

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  • Executing / Running a python script from ubuntu server

    - by Shishant
    Hello, Can anybody help me how to run a python script through command line? My python script http://buffis.com/2007/07/25/getting-info_hash-for-xbt-tracker/comment-page-1/ I am using this command /var/www/hash_info.py /var/www/Muha_Album.7912.torrent I have copied dependency file bencode.py mentioned in article link above. When I execute the above command I get error No such file or directory but when i chmod the file to 644 it says Permission denied the file is present at the location. I have installed pythong using this command apt-get install python-gtk2 python-glade2 Thank You.

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