Python API bindings

The Python binding should be complete and are mostly automatically generated from the formal description of the API in xml. The bindings are articulated around 2 classes virConnect and virDomain mapping to the C types. Functions in the C API taking either type as argument then becomes methods for the classes, their name is just stripped from the virConnect or virDomain(Get) prefix and the first letter gets converted to lower case, for example the C functions:

int virConnectNumOfDomains (virConnectPtr conn);

int virDomainSetMaxMemory (virDomainPtr domain, unsigned long memory);



virDomain::setMaxMemory(self, memory)

This process is fully automated, you can get a summary of the conversion in the file libvirtclass.txt present in the python dir or in the docs.There is a couple of function who don't map directly to their C counterparts due to specificities in their argument conversions:

So let's look at a simple example inspired from the test found in python/tests/ in the source tree:

import libvirt
import sys

conn = libvirt.openReadOnly(None)
if conn == None:
    print 'Failed to open connection to the hypervisor'

    dom0 = conn.lookupByName("Domain-0")
    print 'Failed to find the main domain'

print "Domain 0: id %d running %s" % (dom0.ID(), dom0.OSType())

There is not much to comment about it, it really is a straight mapping from the C API, the only points to notice are: