Develop Reference

How do I change the name of the python DLL when compiling a library like pillow?

Question:
I want to compile a third-party library like Pillow or Numbpy but I want to change the name of the python27.dll to corepython27.dll. How do I do this during the compile process? Is it something I need to change in the setup.py? Or the distutils library?
I should explain that I have no experience in compiling at all. I just know that I will need to make this change as I learn more about the basics of compiling.
Explanation:
Corel's PaintShop Pro uses an embedded python interpreter to run scripts inside the program. And I would like to be able to use third-party libraries like pillow and numpy but they always fail to load. The version of python that is included with PaintShop Pro is 2.7.5. I've made sure to download the appropriate versions of these libraries but it always fails with a "DLL module doesn't exist" type error.
Using a PE viewer I was able to see that other libraries like TKinter were using imports corepython27.dll instead of python27.dll like pillow was.
Also pillow for 2.7 was using msvcr90.dll but the custom version of the tkinter library included with PSP was compiled with msvcr110.dll. Do you think this will be an issue? Do I need to compile pillow with the appropriate version of msvcr DLL? Or is matching versions (2.7) and making sure it uses the correct python.dll (corepython27.dll) the only important thing?

You can create a symbolic link named corepython27.dll showing to the installed python27.dll. You can do this in your console via the command
MKLINK <path_to_corepython.dll> <path_to_python27.dll>

python: import com.oceanoptics.omnidriver.api.wrapper.Wrapper

I am trying to import the following api wrapper / device driver as in this python package:
import com.oceanoptics.omnidriver.api.wrapper.Wrapper
Python just returns that there is no module named like this:
ImportError: No module named com.oceanoptics.omnidriver.api.wrapper.Wrapper
I installed Omnidriver from the device manufacturer's website. Specifically, I used the installer OmniDriver-2.37-win32-installer.exe and installed the "Development version". It installs a bunch of dlls in C:\Program Files (x86)\Ocean Optics\OmniDriver\OOI_HOME.
The wrapper is working properly in Matlab after adding C:\Program Files (x86)\Ocean Optics\OmniDriver\OOI_HOME to C:\Program Files (x86)\MATLAB\R2012b\toolbox\local\librarypath.txt and C:\Program Files (x86)\Ocean Optics\OmniDriver\OOI_HOME\OmniDriver.jar to C:\Program Files (x86)\MATLAB\R2012b\toolbox\local\classpath.txt. Thereafter, I can load the wrapper in Matlab with wrapper = com.oceanoptics.omnidriver.api.wrapper.Wrapper().
I guess my python installation (Enthought Canopy 1.4.1 win 32bit) is not looking for the dlls in the correct path because I would have to tell first.
So, my question is, how do I instruct python to successfully execute the import statement above?

Another approach for interfacing to the spectrometer using Python would be to use the python-seabreeze package. The package does not have thorough documentation, but if you're willing to be patient and try things out for yourself, then you should be able to get it to work. The author has put considerable work into making the package compatible with the vast majority of Ocean Optics' spectrometers. I just finished installing it on my Windows laptop and got it to work in under an hour.

I checked the website, and can't find any reference to python support. I believe the instructions you referenced are instructions how to install the java classes. I could find no information that mentioned or discussed python modules. You should contact Oceanview for clarification.

Python & Tide SDK - import external module?

Since python is bundled with the Tide SDK, I can't figure out how to use access external modules. I've tried copying the module folder "Lib/site-packages/YourModuleHere" to the tide SDK directory, and this suggestion here: TIdeSDK Python module import but with no success. The module I'm trying to use is https://github.com/burnash/gspread
Any ideas?
Thanks...

You may try http://www.py2exe.org/index.cgi/Tutorial
to convert your python code to exe with all needed modules then use Ti.Process.createProcess() to call your exe

In current version of TideSDK, loading custom python modules is not supported.It loads default set of Python modules compiled within the SDK.

I've had some luck installing a view external modules by running setup.py install from TideSDK's python.exe
This post helped:
Installing python modules in TideSDK
For Windows 7:
launch powershell
cd into the module folder
run:
C:\ProgramData\TideSDK\Modules\python\1.3.1-beta\python.exe setup.py install
It installs the module in \Lib\site-packages, as it should, and I'm able to use the import function in the python code.
This has worked for PIL and I'm trying to get it to function with pywin32. I'd love to hear if it works for other modules

Eclipse and python: library will import in interprer, but not in IDE

I'm running Windows 7, Python 2.6.4 and the latest version of Eclipse. I downloaded the boto library (http://code.google.com/p/boto/) and ran python setup.py install, which created boto-1.9b-py2.6.egg in C:\Python26\Lib\site-packages.
Importing a class - say, by doing 'from boto.sqs.connection import SQSConnection' - works fine from the python command line tool. But Eclipse will not find boto, despite the fact that it is using the same python interpreter as I am using when at the command line. I added the library as an external source folder, but that didn't work either. How can I properly import the boto library into Eclipse?
Thanks.

From the comment so can be marked as answered
In Preferences->Pydev->interpreter - Python what is the System libs value

For libraries that are required only in a single project, the best practice is to add them to the Project's PYTHONPATH and not the SYSTEM PYTHONPATH.
This is done by right clicking on the project -> Properties -> PyDev-PYTHONPATH -> External Libraries and then adding the required library using Add zip/jar/egg.

How do I find out what Python libraries are installed on my Mac?

I'm just starting out with Python, and have found out that I can import various libraries. How do I find out what libraries exist on my Mac that I can import? How do I find out what functions they include?
I seem to remember using some web server type thing to browse through local help files, but I may have imagined that!

From the Python REPL (the command-line interpreter / Read-Eval-Print-Loop), type help("modules") to see a list of all your available libs.
Then to see functions within a module, do help("posix"), for example. If you haven't imported the library yet, you have to put quotes around the library's name.

For the web server, you can run the pydoc module that is included in the python distribution as a script:
python /path/to/pydoc.py -p 1234
where 1234 is the port you want the server to run at. You can then visit http://localhost:1234/ and browse the documentation.

Every standard python distribution has these libraries, which cover most of what you will need in a project.
In case you need to find out if a library exists at runtime, you do it like this
try:
import ObscureModule
except ImportError:
print "you need to install ObscureModule"
sys.exit(1) # or something like that

You can install another library: yolk.
yolk is a python package manager and will show you everything you have added via pypi. But it will also show you site-packages added through whatever local package manager you run.

just run the Python interpeter and type the command
import "lib_name"
if it gives an error, you don't have the lib installed...else you are good to go

On Leopard, depending on the python package you're using and the version number, the modules can be found in /Library/Python:
/Library/Python/2.5/site-packages
or in /Library/Frameworks
/Library/Frameworks/Python.framework/Versions/Current/lib/python2.6/site-packages
(it could also be 3.0 or whatever version)...
I guess it is quite the same with Tiger

Considering that in every operating system most of python's packages are installed using 'pip' (see pip documentation) you can also use the command 'pip freeze' on a terminal to print a list of all the packages you have installed through it.
Other tools like 'homebrew' for macOS (used when for some reason you can't install a package using pip) have similar commands, in this specific case 'brew list'.