This method creates a restore point to which one can return later by calling changeRollback method. This function should be called before any transaction with interface configuration. Once it is known that a new configuration works, it can be committed via the changeCommit method, which frees the restore point.

If the changeBegin method is called when a transaction is already opened, an error will be thrown.

​# Example-31.py
​#!/usr/bin/env python3
​import sys
​import libvirt
​
​conn = None
​try:
​    conn = libvirt.open("qemu:///system")
​except libvirt.libvirtError as e:
​    print(repr(e), file=sys.stderr)
​    exit(1)
​
​iface = conn.changeBegin()
​
​conn.close()
​exit(0)