PyOGP Client Library File System

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When using buildout, the PyOGP development sandbox file system has the following structure:

  • bin - contains all executable which might be provided by the library eggs. Also contains the buildout script, needed for updating packages. Also contains some sample scripts.
  • bootstrap.py - only used for the buildout bootstrapping process.
  • buildout.cfg - the buildout configuration file.
  • develop-eggs - contains links to eggs which are in development right now (usually links to src/)
  • eggs - contains the eggs (python packages) which are installed locally in this buildout
  • parts - used by buildout for downloading and installing packages
  • src - contains the actual source code of the library, test harness and so on.

The src directory

The src/ directory contains all the packages we are developing right now. These packages are also called Python Eggs. Each package usually has a namespace like 'pyogp.lib.base'. This can later be used like this:

 from pyogp.lib.base import *

Other packages can claim part of the same namespace like 'pyogp.lib.somethingelse' without being in the same directory as it would be the case usually in Python. This is a feature of Python Eggs and explained here.

Because of this the packages are named like their namespace. The contents of these packages is also following this path structure and 'pyogp.lib.base' for instance looks like this:

pyogp/
pyogp/lib
pyogp/lib/base

The actual code is to be found in 'pyogp/lib/base'. All the other directories should not be touched unless you know what you are doing.

The current packages in source are:

pyogp.lib.base
pyogp.lib.client
pyogp.apps

More info on packages

Python eggs in src/ are usually subversion externals, meaning that they are just referenced. You can see the externals used in src/EXTERNALS.txt. This gives us the flexibility to use the source checkout of those eggs in different buildouts with different configurations and additionally also to use packages from other repositories if needed.

The top directory of each egg (pyogp.lib.base in our example) also contains a file called 'setup.py' which is a configuration file for that egg. You can read about these files in the Distutils and setuptool documentation.