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pyodbc and python 3.4 on Windows

pyodbc is a very nice thing, but the Windows installers only work with their very specific python version. With the release of Python 3.4, the only available installers just stop once they don't see 3.3 in the registry (though 3.4 is certainly there).
Copying the .pyd and .egg-info files from a 3.3 installation into the 3.4 site-packages directory doesn't seem to do the trick. When importing pyodbc, an ImportError is thrown: ImportError: DLL load failed: %1 is not a valid Win32 application.
Is there a secret sauce that can be added to make the 3.3 file work correctly? Or do we just need to wait for a 3.4 installer version?

The different versions of Python are (for the most part) not binary-compatible, and thus any compiled extensions (such as pyodbc) will only work for a specific version.
Note that pure-Python packages (the ones that are completely written in Python, and have no non-Python dependencies) do not need to be compiled, and thus can be written to support multiple Python versions.
Also note that it is technically possible for a compiled extension to be written such that it works for Python 3.2 as well as 3.3, 3.4, and the future 3.x's to come, but they have to limit themselves to the "stable ABI" as specified by PEP 384, and most extensions do not do this. As far as I know, pyodbc is not limited to the stable ABI and must be compiled separately for each Python version.
That said, it is also possible to compile your own version of pyodbc from source, as long as you have the required tools and expertise. (But I'm guessing if you're asking this question, you don't. I don't either, otherwise I'd include some tips in this answer.)
As you have already commented, pypyodbc may be your best bet, as it is a pure-Python package.
Installing pypyodbc can be done via the commandline:
C:\Python34\Scripts>pip install pypyodbc
Using it as drop-in replacement of pyodbc can be done using:
import pypyodbc as pyodbc
[The current version of pyodbc at the time of this edit is 3.0.10, and it does support Python 3.4. Of course, it's still useful to be aware of pypyodbc in case pyodbc falls behind again when future versions of Python are released.]

Did you try to download from here? It has an unofficial build for 3.4. I did a quick test myself, looks like it's working fine for me.

I fixed this by installing pyodbc 3.0.10. The latest version of pyodbc didn't work on Windows with Python 3.4
However pyodbc 3.0.10 did work for me
Install command on command prompt : pip install pyodbc 3.0.10

Installing rpm module for (non-system) Python

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

python installation can't find psycopg2 ImportError

I'm calling on psycopg2 with
import psycopg2
I get the std error
ImportError: No module named psycopg2
I installed my copy with macports, so I'm curious why it wouldn't work because all of the dependencies should be downloaded as well.
I don't have any experience with Postgresql, nor this module, so I don't know what could be going wrong. Fact is, another project I'm trying to get built calls upon it, so if I could avoid using this I would. :)
I'm sure that postgresql is installed, but that has little to do with the fact that my installation can't find psycopg2. Any suggestinos would be appreciated.
$ which python
reveals
/Library/Frameworks/Python.framework/Versions/Current/bin/python
and
$ python --version
reveals
Python 2.7.3 -- EPD_free 7.3-2 (32-bit)
I don't necessarily want the version of EPD_free, but I had to install it for (somewhat) unrelated reasons.

MacPorts installs its own version of Python alongside Apple's version. You can manage the active version of Python (the one that gets run when you type in python at the command line or by /usr/bin/env) by using the port select command. See this question.

How can access MySQL with Python?

How can I access MySQL with Python on windows environment ?
I took a look to MySQLdb but in the README says:
"I don't do Windows. However if someone provides me with a package for Windows, I'll make it available."
So is there easy way to access MySQL on Windows or I should install Red Hat & go from there?

The README doesn't mean MySQLdb isn't available for Windows. It only means that the library's maintainer doesn't provide binaries for Windows.
You can still get these binaries for Windows either by 1) compiling them yourself or 2) getting them compiled from some third party.
I suggest you to do the latter:
Check out page "MySQL-python Windows 64bit and 32bit distributions"
Locate .exe that matches your OS and Python versions and install it
You are done

Integrating MySQL with Python in Windows

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.