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This wiki will provide code samples and documentation on all processing functions available in the Qpy project to help you get started with writing standalone QGIS python scripts.
If this project is not sitting somewhere in your path, or you just want to be sure your script will execute, add the following lines to your python script at the top/in your python shell:
import sys
sys.path.append("/path/to/qpy/project/folder")
Start a python2 shell either in the base directory of this Github project or have this module in your system path. Then simply import qpy.
$ python2
Python 2.7.12+ (default, Sep 1 2016, 20:27:38)
[GCC 6.2.0 20160822] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import qpy
Initializing qpy for a linux system
>>>
Running your standalone script would be as simple as doing the following:
$ python2 my_qpy_script.py
Or, if you have your shebang set up properly:
$ ./my_qpy_script.py
Ensure that you are running an OSGeo4W shell, and execute either python-qgis or python-qgis-ltr, whichever one is available. This library is tested using the ltr Python shell on Windows. The windows version is still under development so it may or may not successfully import qpy.
OSX is currently not supported due to not having access to Apple products, and most likely will never be supported unless an OSX developer joins the project. Most likely, the linux instructions should work fine but I don't know. I recommend dual-booting a Linux distro or running one in a VM until OSX is "officially" supported.