INTRODUCTION:

The python-classad package aims to provide a python interface to the ClassAd
library used by HTCondor.  It tries to expose as many "safe" uses of ClassAds
as possible while maintaining an interface which is natural to python
programmers.

BUILDING:

Building requires the following:
- CMake 2.6 or higher
- boost.python and development libraries
- python development libraries

For a RHEL6-like OS, you need the cmake, boost-devel, boost-python, and
python-devel libraries.

Perform:

cmake .
make

This produces "classad.so" in the working directory.

USING

See below for an example session:

[bbockelm@hcc-briantest python-classads]$ python
Python 2.6.6 (r266:84292, Jun 18 2012, 09:57:52) 
[GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import classad
>>> ad = classad.ClassAd()
>>> expr = classad.ExprTree("2+2")
>>> ad["foo"] = expr
>>> print ad["foo"].eval()
4
>>> ad["bar"] = 2.1
>>> ad["baz"] = classad.ExprTree("time() + 4")
>>> print list(ad)
['bar', 'foo', 'baz']
>>> print dict(ad.items())
{'baz': time() + 4, 'foo': 2 + 2, 'bar': 2.100000000000000E+00}
>>> print ad

    [
        bar = 2.100000000000000E+00; 
        foo = 2 + 2; 
        baz = time() + 4
    ]
>>> ad2=classad.parse(open("test_ad", "r"));
>>> ad2["error"] = classad.Value.Error
>>> ad2["undefined"] = classad.Value.Undefined
>>> print ad2

    [
        error = error; 
        bar = 2.100000000000000E+00; 
        foo = 2 + 2; 
        undefined = undefined; 
        baz = time() + 4
    ]
>>> ad2["undefined"]
classad.Value.Undefined
>>>