I've been trying to connect opencv and python in both Ubuntu and Windows XP. I've failed on both.
I've read many webpages and threads about "how to install" it but none has worked (the worst part is that they all say kind of the same).
Steps (windows xp):
Installed Python 2.7 by default (works perfectly)
Installed PIL and cx_Freeze (may they
create a conflict? I don't think so
:s)
Installed Opencv 2.2 by default
(OpenCV-2.2.0-win32-vs2010.exe) and
it isn't recognized inside a py nor
as import opencv.cv nor using the
cookbook way, import cv (I skipped
the visual studio steps since I'll
use it with python)
Checked path (it's ok, it has the
Opencv2.2\bin thing)
Rechecked webpages and stuff
Steps (ubuntu):
Had python working
sudo apt-get install, cmake, make,
sudo make install, etcetc (from the
tutorials)
same thing... module not recognized
Please can you help?
Update:
I managed to install it and have it recognized by the system (I used http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv and it worked perfectly after that).
The problem now is that it crashes when I try to use CaptureFromFile. Someone else has reported it 3 days ago so now I wait.
I'll check the other wrappers, maybe one of them will work.
For windows see my web page: http://www.modernmind.org/wiki/OpenCV
For Ubuntu you should just need to apt-get install python-dev then generate the make files with Cmake, build it and then make install. In order to build the python bindings you need to have the python header files on your system and you probably don't. When you run configure in Cmake make sure that you don't see any messages at the top about PYTHON_INCLUDE not being defined.
To access a library it needs a Python library installed in the Python version you are using. From what you write above it seems to me that you install OpenCV in general, but that you don't specifically install the Python library. This is why it doesn't work.
I'm not sure how to install the Python wrappers, and the OpenCV documentation is a bit sparse on that info. But if you did build them (and that needs to be turned on explicitly, says the docs) they seem to end up in opencv/release/lib .
Look at "Testing Python wrappers" on http://opencv.willowgarage.com/wiki/InstallGuide
If there is still no luck, there is a bunch of alternative Python wrappers available: http://pypi.python.org/pypi?%3Aaction=search&term=opencv&submit=search
Maybe they are better documented.
Related
I am currently attempting to install a third-party package (gnuradio, to be specific) into the Canopy version of Python on an Ubuntu computer. I currently have the entire package stored in my filesystem as a folder with subfolders and python files; however, I have been able to find no information as to how to make the transition into a functionally installed and recognized package. How can I do so?
You shouldn't use third party pythons on Ubuntu, unless you very exactly know what you're doing (you don't). Ubuntu keeps your python up-to-date and uses the package manager to install pack
So, setting up a recent version of python is just
sudo apt-get install python
So if you still want to integrate GNU Radio into your canopy installation, you will need to get the development headers of exactly their version of python, and specify that you want to only use them etc, and build GNU Radio from source. I do not recommend doing that.
In my opinion, you should probably rather install GNU Radio either from source against the python and libraries on your main OS rather than canopy's happy little installation folder, or use the gnuradio package that Ubuntu has.
I recommend using pybombs to install GNU Radio from source. You'll get the latest and greatest, in a safe install prefix, and easy access to bleeding edge SDR device drivers.
(1) Python packaging is inconsistent, but in general, it suffices to type python setup.py install from the package's top directory (see https://docs.python.org/2/install/#the-new-standard-distutils)
(2) How to be sure that you are installing into Canopy Python rather than your system Python? See https://support.enthought.com/entries/23389761-Installing-packages-into-Canopy-Python-from-the-command-line (tl;dr open a Canopy Terminal window from the Canopy Tools menu.)
EDIT: Marcus Müller has clarified below that gnuradio is not a python package, so this general advice is true but irrelevant. See his answer below.
I need to support some software that is using an old Python version (2.4). So I have downloaded and compiled Python 2.4 and installed it in a virtualenv. So far, all OK and normal procedure.
But the software is trying to import an rpm module. And I cannot find a source for that module (it is not part of the standard Python library, afaict).
Typically, once the virtualenv is enabled (source env/bin/activate) I can install required software using easy_install. But easy_install rpm is failing to find anything. There is a pyrpm module, but it is not the same thing (it installs a module called "pyrpm"). And google searches are useless, as they all link to articles on how to build rpms...
If I were using the system python (on Ubuntu) I could install the python-rpm package. But that is for Python 2.7. How do I install the equivalent for Python 2.4?
[My impression is that the rpm libraries, used by many Linux systems, include a Python library, which is packaged as python-dev by the distro. But I can't see how to access that for an arbitrary python version.]
I AM NOT LOOKING FOR AN RPM THAT CONTAINS PYTHON 2.4. I AM LOOKING FOR A MODULE NAMED rpm THAT IS USED BY SOFTWARE WRITTEN FOR PYTHON 2.4.
It's right there, in the python-rpm RPM package:
http://rpmfind.net/linux/rpm2html/search.php?query=python-rpm
You will probably want to download the package contents, extract them, and then use
python setup.py install
From your active environment.
Of course, as it's pre compiled, you might have trouble getting the C extension to run.
I'm not familiar enough with RPM's to know whether you can get the source from there.
No guarantees the package will work with your python version though.
there's no simple way to do this; the python library is part of the system rpm package and interfaces to C code, so is closely tied to the rpm package installed on your machine.
instead, it's much simpler to install an old OS in a VM (eg CentOS 5) that uses Python 2.4. then everything is consistent and works.
the sources for the rpm module can be found here: http://www.rpm.org/wiki/Download
After you download the wanted version read and follow the INSTALL instructions in order to compile it on your target OS. Afterwards make sure you add the correct path to the 'site-packages' folder the installation chose into your PYTHONPATH environment variable.
To test start your python interpreter and run 'import rpm'
HTH,
Ran
I'm a complete beginner learning Python. I noticed the Windows installer for Python states "does not include source" and below it there's an option to install the source via tarball.
http://www.python.org/getit/
What is left out if I install it with the windows installer without the source?
The source code.
This can be useful as a reference, or if, for example, you are doing Cython development (where you need the source to compile against).
In general though, the source isn't needed for the average Python user. If you need it, you'll know about it.
I was trying to install matplotlib in Mac OSX Lion. Tried to used the binary that is in the sourcefourge site, but I got this error: "matplotlib requires System Python 2.7 to install".
I went to the Terminal and typed python --version and its check the requirements.
After this I tried to used the pip, and while doing so é got the following error:
"src/_image.cpp:908: error: invalid use of incomplete type ‘struct png_info_def’"
Can you give me clues in how to install it?
Many thanks.
EDIT: I found a way, without having to install a new version of python:
http://the.taoofmac.com/space/blog/2011/07/24/2222
This is because of a change in the API for libpng v1.5 (which is included with Mac OSX Lion). The changes has already been pushed upstream, so you will need to compile from the upstream repository until the next release.
You can follow the instructions on http://jholewinski.wordpress.com/2011/07/21/installing-matplotlib-on-os-x-10-7-with-homebrew/
I followed this page's instructions. I got stuck at
pip install -e git+https://github.com/matplotlib/matplotlib#egg=matplotlib-dev
Then I did:
git clone https://github.com/matplotlib/matplotlib.git
cd matplotlib
python setup.py build
python setup.py install
Checked my installation by typing in terminal:
python
import matplotlib
print matplotlib.__version__
print matplotlib.__file__
I got version 0.10.0 dev (as of this writing) and path /usr/local/Cellar/...
You can try with an "official" python distribution, apple might have tweaked the supplied one. You can find the 2.7 here: http://www.python.org/download/
You might have to re-install numpy as well afterwords: http://sourceforge.net/projects/numpy/files/NumPy/1.6.1/
I would suggest to install scipy as well
Let me know if it works ;)
I would recommend using macports, it should take care of dependencies and would be indepedent of the system python version.
EDIT: Just a few clarifications, taking into account comments to this answer.
Why use macports (or another installer)? Because they take care of dependencies, provide functionality to uninstall and switch between versions (I've used the latter successfully for gcc and python). And because the default installation location is not the system executable location. Overriding the system python can break applications that rely on it (this is certainly true in many Linux distributions, maybe less so on mac OS X).
When is it particularly useful? When you want to install on top of a version of python that is different to system python, and when you have non-python extensions (C, C++, Fortran...).
What's the down side? As #Trond has mentioned in the comments, it is good if you're OK with default compilations of packages. You don't have a handle over configuration or compiler flags as you would if you built from source.
A good alternative to macports is fink, which seems to give you more control (build from source). I am not sure it is completely ready for mac OS X Lion yet.
I know it will take a lot more time, but I would reccomend installing python, numpy, and matplotlib from source to ensure that you have consistency in your system. From the error it could look like you have a problem with libPNG support. I have a written a "How to install python dev tools on Mac OSX" that you may find useful. It contains directions for how to install python, numpy, matplotlib and all necessary dependencies. I understand you are working with Python 2.7 and the directions I am listing is for Python 2.6.5, but it would be the same approach. Hope you get it to work.
You could just install the Python 2.6 version of Matplotlib, assuming that Python2.6 is included with Lion (py2.5 & 2.6 are included with Mac OS 10.6 "Snow Leopard" - try typing python2.6 to find out if that version is installed.).
On MacPorts you do this via something like:
sudo port install py26-matplotlib
where py26-... (or py25-..., py27-... etc.) indicates which python version it is meant for. (check the Pallet/ports list to get the correct package name, in case I guessed wrong)
I am finding it difficult to use MySQL with Python in my windows system.
I am currently using Python 2.6. I have tried to compile MySQL-python-1.2.3b1 (which is supposed to work for Python 2.6 ?) source code using the provided setup scripts. The setup script runs and it doesn't report any error but it doesn't generate _mysql module.
I have also tried setting up MySQL for Python 2.5 with out success. The problem with using 2.5 is that Python 2.5 is compiled with visual studio 2003 (I installed it using the provided binaries). I have visual studio 2005 on my windows system. Hence setuptools fails to generate _mysql module.
Any help ?
Download page for python-mysqldb. The page includes binaries for 32 and 64 bit versions of for Python 2.5, 2.6 and 2.7.
There's also discussion on getting rid of the deprecation warning.
UPDATE: This is an old answer. Currently, I would recommend using PyMySQL. It's pure python, so it supports all OSes equally, it's almost a drop-in replacement for mysqldb, and it also works with python 3. The best way to install it is using pip. You can install it from here (more instructions here), and then run:
pip install pymysql
This may read like your grandpa givin advice, but all answers here did not mention the best way: go nd install ActivePython instead of python.org windows binaries. I was really wondering for a long time why Python development on windows was such a pita - until I installed activestate python. I am not affiliated with them. It is just the plain truth. Write it on every wall: Python development on Windows = ActiveState!
you then just pypm install mysql-python and everything works smoothly. no compile orgy. no strange errors. no terror. Just start coding and doing real work after five minutes.
This is the only way to go on windows. Really.
As Python newbie learning the Python ecosystem I've just completed this.
Install setuptools instructions
Install MySQL 5.1. Download the 97.6MB MSI from here You can't use the essentials version because it doesnt contain the C libraries.
Be sure to select a custom install, and mark the development tools / libraries for installation as that is not done by default. This is needed to get the C header files.
You can verify you have done this correctly by looking in your install directory for a folder named "include". E.G C:\Program Files\MySQL\MySQL Server 5.1\include. It should have a whole bunch of .h files.
Install Microsoft Visual Studio C++ Express 2008 from here This is needed to get a C compiler.
Open up a command line as administrator (right click on the Cmd shortcut and then "run as administrator". Be sure to open a fresh window after you have installed those things or your path won't be updated and the install will still fail.
From the command prompt:
easy_install -b C:\temp\sometempdir mysql-python
That will fail - which is OK.
Now open site.cfg in your temp directory C:\temp\sometempdir and edit the "registry_key" setting to:
registry_key = SOFTWARE\MySQL AB\MySQL Server 5.1
now CD into your temp dir and:
python setup.py clean
python setup.py install
You should be ready to rock!
Here is a super simple script to start off learning the Python DB API for you - if you need it.
I found a location were one person had successfully built mysql for python2.6, sharing the link, http://www.technicalbard.com/files/MySQL-python-1.2.2.win32-py2.6.exe
...you might see a warning while import MySQLdb which is fine and that won’t hurt anything,
C:\Python26\lib\site-packages\MySQLdb__init__.py:34: DeprecationWarning: the sets module is deprecated
from sets import ImmutableSet
What about pymysql? It's pure Python, and I've used it on Windows with considerable success, bypassing the difficulties of compiling and installing mysql-python.
You're not the only person having problems with Python 2.6 and MySQL (http://blog.contriving.net/2009/03/04/using-python-26-mysql-on-windows-is-nearly-impossible/). Here's an explanation how it should run under Python 2.5 http://i.justrealized.com/2008/04/08/how-to-install-python-and-django-in-windows-vista/
Good luck
The precompiled binaries on http://www.lfd.uci.edu/~gohlke/pythonlibs/#mysql-python is just worked for me.
Open MySQL_python-1.2.5-cp27-none-win_amd64.whl file with zip
extractor program.
Copy the contents to
C:\Python27\Lib\site-packages\
On Python 3.4 I've installed mysqlclient from http://www.lfd.uci.edu/~gohlke/pythonlibs/ with pip install mysqlclient and it's working.
You can try to use myPySQL. It's really easy to use; no compilation for windows, and even if you need to compile it for any reason, you only need Python and Visual C installed (not mysql).
http://code.google.com/p/mypysql/
Good luck
There are Windows binaries for MySQL-Python (2.4 & 2.5) available on Sourceforge. Have you tried those?
Because I am running python in a (pylons/pyramid) virtualenv, I could not run the binary installers (helpfully) linked to previously.
I had problems following the steps with Willie's answer, but I determined that the problem is (probably) that I am running windows 7 x64 install, which puts the registry key for mysql in a slightly different location, specifically in my case (note: I am running version 5.5) in: "HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MySQL AB\MySQL Server 5.5".
HOWEVER, "HKEY_LOCAL_MACHINE\" cannot be included in the path or it will fail.
Also, I had to do a restart between steps 3 and 4.
After working through all of this, IMO it would have been smarter to run the entire python dev environment from cygwin.
If you are looking for Python 3.2 this seems the best solution I found so far
for Python 2.4 - 3.2 PyMySQL
for Python 2.3 - 2.6 MySQL for Python
Source: http://wiki.python.org/moin/MySQL
You might want to also consider making use of Cygwin, it has mysql python libraries in the repository.
You can also use pyodbc with the MySQL Connector/ODBC to use MySQL on Windows. Unixodbc is also available to make the code compatible on Linux. Pyodbc uses the standard Python DB API 2.0 so if you stick with that switching between MySQL/PostgreSQL/SQLite/ODBC/JDBC drivers etc. should be relatively painless.
upvoted itsadok's answer because it led me to the installation for python 2.7 as well, which is located here: http://www.codegood.com/archives/129
Got sick of the installation troubles with MySQLdb and tried pymysql instead.
Easy setup;
git clone https://github.com/petehunt/PyMySQL.git
python setup.py install
And APIs are pretty much the same.