diff --git a/nova/compute/api.py b/nova/compute/api.py
index a84056dee2c9..262a8819df55 100644
--- a/nova/compute/api.py
+++ b/nova/compute/api.py
@@ -78,14 +78,14 @@ class ComputeAPI(base.Base):
             if ramdisk_id is None:
                 ramdisk_id = image.get('ramdiskId', FLAGS.default_ramdisk)
             #Salvatore - No kernel and ramdisk for raw images
-            if (kernel_id == str(FLAGS.null_kernel)):
+            if kernel_id == str(FLAGS.null_kernel):
                 kernel_id = None
                 ramdisk_id = None
                 logging.debug("Creating a raw instance")
             # Make sure we have access to kernel and ramdisk (if not raw)
-            if (kernel_id != None):
+            if kernel_id:
                 image_service.show(context, kernel_id)
-            if (ramdisk_id != None):
+            if ramdisk_id:
                 image_service.show(context, ramdisk_id)
             # Make sure we have access to kernel and ramdisk
             self.image_service.show(context, kernel_id)
@@ -109,7 +109,6 @@ class ComputeAPI(base.Base):
             key_data = key_pair['public_key']
 
         type_data = instance_types.INSTANCE_TYPES[instance_type]
-        #Salvatore TODO: PV or HVM
         base_options = {
             'reservation_id': utils.generate_uid('r'),
             'image_id': image_id,
diff --git a/nova/virt/xenapi/vm_utils.py b/nova/virt/xenapi/vm_utils.py
index 18938ec3c16e..d136810d5513 100644
--- a/nova/virt/xenapi/vm_utils.py
+++ b/nova/virt/xenapi/vm_utils.py
@@ -105,7 +105,7 @@ class VMHelper():
             }
         #Complete VM configuration record according to the image type
         #non-raw/raw with PV kernel/raw in HVM mode
-        if (instance.kernel_id):
+        if instance.kernel_id:
             rec['PV_bootloader'] = ''
             rec['PV_kernel'] = kernel
             rec['PV_ramdisk'] = ramdisk
@@ -113,7 +113,7 @@ class VMHelper():
             rec['PV_bootloader_args'] = ''
             rec['PV_legacy_args'] = ''
         else:
-            if (pv_kernel):
+            if pv_kernel:
                 rec['PV_args'] = 'noninteractive'
                 rec['PV_bootloader'] = 'pygrub'
             else:
diff --git a/nova/virt/xenapi/vmops.py b/nova/virt/xenapi/vmops.py
index 85e1992752ae..0726882df0dd 100644
--- a/nova/virt/xenapi/vmops.py
+++ b/nova/virt/xenapi/vmops.py
@@ -65,7 +65,7 @@ class VMOps(object):
         user = AuthManager().get_user(instance.user_id)
         project = AuthManager().get_project(instance.project_id)
         #if kernel is not present we must download a raw disk
-        if (instance.kernel_id):
+        if instance.kernel_id:
             disk_image_type = 1
         else:
             disk_image_type = 2
@@ -74,14 +74,14 @@ class VMOps(object):
         vdi_ref = yield self._session.call_xenapi('VDI.get_by_uuid', vdi_uuid)
         #Have a look at the VDI and see if it has a PV kernel
         pv_kernel = False
-        if (not instance.kernel_id):
+        if not instance.kernel_id:
             pv_kernel = yield VMHelper.lookup_image(self._session, vdi_ref)
         kernel = None
-        if (instance.kernel_id):
+        if instance.kernel_id:
             kernel = yield VMHelper.fetch_image(self._session,
                 instance.kernel_id, user, project, 0)
         ramdisk = None
-        if (instance.ramdisk_id):
+        if instance.ramdisk_id:
             ramdisk = yield VMHelper.fetch_image(self._session,
                 instance.ramdisk_id, user, project, 0)
         vm_ref = yield VMHelper.create_vm(self._session,
diff --git a/plugins/xenapi/etc/xapi.d/plugins/objectstore b/plugins/xenapi/etc/xapi.d/plugins/objectstore
index e17f1ba13e71..8ee2f748d710 100644
--- a/plugins/xenapi/etc/xapi.d/plugins/objectstore
+++ b/plugins/xenapi/etc/xapi.d/plugins/objectstore
@@ -48,7 +48,7 @@ def is_vdi_pv(session,args):
     vdi = exists(args, 'vdi-ref')
     pv=with_vdi_in_dom0(session, vdi, False,
                      lambda dev: _is_vdi_pv('/dev/%s' % dev))
-    if (pv):
+    if pv:
         return 'true'
     else:
         return 'false'
@@ -58,11 +58,10 @@ def _is_vdi_pv(dest):
     output=os.popen('pygrub -qn %s' % dest)
     pv=False
     for line in output.readlines():
-        #logging.debug("line:",line)
         #try to find kernel string
         m=re.search('(?<=kernel:)/.*(?:>)',line)
-        if (m<>None):
-            if m.group(0).find('xen')<>-1:
+        if m:
+            if m.group(0).find('xen')!=-1:
                 pv=True
     logging.debug("PV:%d",pv)
     return pv