Packaging a Python library
I have a few Munin plugins which report stats from an Autonomy database. They all use a small library which scrapes the XML status output for the relevant numbers.
I'm trying to bundle the library and plugins into a Puppet-installable RPM. The actual RPM-building should be straightforward; once I have a distutils-produced distfile I can make it into an RPM based on a .spec file pinched from the Dag or EPEL repos . It's the distutils bit I'm unsure of -- in fact I'm not even sure my library is correctly written for packaging. Here's how it works:
import datetime import os import stat import sys import time import urllib import xml.sax class IDOL7Stats: cache_dir = '/tmp' def __init__(self, host, port): self.host = host self.port = port # ... def collect(self): self.data = self.__parseXML(self.__getXML()) def total_slots(self): return self.data['Service:Documents:TotalSlots']
from idol7stats import IDOL7Stats a = IDOL7Stats('db.example.com', 23113) a.collect() print a.total_slots()
I guess I want idol7stats.py to wind up in /usr/lib/python2.4/site-packages/idol7stats, or something else in Python's search path. What distutils magic do I need? This:
from distutils.core import setup setup(name = 'idol7stats', author = 'Me', author_email = 'email@example.com', version = '0.1', py_modules = ['idol7stats'])
almost works, except the code goes in /usr/lib/python2.4/site-packages/idol7stats.py, not a subdirectory. I expect this is down to my not understanding the difference between modules/packages/other containers in Python.
So, what's the rub?
 Yeah, I could just plonk the library in /usr/lib/python2.4/site-packages using RPM but I want to know how to package Python code.
You need to create a package to do what you want. You'd need a directory named idol7stats containing a file called __init__.py and any other library modules to package. Also, this will affect your scripts' imports; if you put idol7stats.py in a package called idol7stats, then your scripts need to "import idol7stats.idol7stats".
To avoid that, you could just rename idol7stats.py to idol7stats/__init__.py, or you could put this line into idol7stats/__init__.py to "massage" the imports into the way you expect them:
from idol7stats.idol7stats import *