When set flags=libvirt.VIR_CONNECT_GET_ALL_DOMAINS_STATS_ENFORCE_STATS, python will report a error: OverflowError: signed integer is greater than maximum Because VIR_CONNECT_GET_ALL_DOMAINS_STATS_ENFORCE_STATS = 2147483648 (2**31), and it set a signed int in PyArg_ParseTuple function. if (!PyArg_ParseTuple(args, (char *)"OOii:virDomainListGetStats", &pyobj_conn, &py_domlist, &stats, &flags)) When python >= 2.3, 'I' means unsigned int and 'i' means int,so there should use 'I'. From: https://docs.python.org/2/c-api/arg.html I also found a lot of function use 'i' for a unsigned int, but i didn't change them. Signed-off-by: Luyao Huang <lhuang(a)redhat.com&gt; --- libvirt-override.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libvirt-override.c b/libvirt-override.c index c887b71..6dacdac 100644 --- a/libvirt-override.c +++ b/libvirt-override.c @@ -8126,7 +8126,7 @@ libvirt_virDomainListGetStats(PyObject *self ATTRIBUTE_UNUSED, unsigned int flags; unsigned int stats; - if (!PyArg_ParseTuple(args, (char *)"OOii:virDomainListGetStats", + if (!PyArg_ParseTuple(args, (char *)"OOII:virDomainListGetStats", &pyobj_conn, &py_domlist, &stats, &flags)) return NULL; -- 1.8.3.1