diff --git a/generic/tests/autotest_regression.py b/generic/tests/autotest_regression.py
index bc40f356c2009db422c200e2e145b37d1dfd57cd..8e734c603e3d2624cf2e41dbace57b0e844aa3fc 100644
--- a/generic/tests/autotest_regression.py
+++ b/generic/tests/autotest_regression.py
@@ -164,7 +164,7 @@ def run(test, params, env):
                 list_labels_output = session_server.cmd(list_labels_cmd)
                 for line in list_labels_output.splitlines():
                     logging.debug(line)
-                if not label_name in list_labels_output:
+                if label_name not in list_labels_output:
                     raise ValueError("No label %s in the output of %s" %
                                      (label_name, list_labels_cmd))
 
@@ -178,10 +178,10 @@ def run(test, params, env):
                 list_hosts_output = session_server.cmd(list_hosts_cmd)
                 for line in list_hosts_output.splitlines():
                     logging.debug(line)
-                if not client_ip in list_hosts_output:
+                if client_ip not in list_hosts_output:
                     raise ValueError("No client %s in the output of %s" %
                                      (client_ip, create_label_cmd))
-                if not label_name in list_hosts_output:
+                if label_name not in list_hosts_output:
                     raise ValueError("No label %s in the output of %s" %
                                      (label_name, create_label_cmd))
 
diff --git a/generic/tests/netstress_kill_guest.py b/generic/tests/netstress_kill_guest.py
index 878d61c560c93107a77cbd381351093df82752a1..09992de8dfe0efce2e35dddd38087909f36159c7 100644
--- a/generic/tests/netstress_kill_guest.py
+++ b/generic/tests/netstress_kill_guest.py
@@ -40,7 +40,7 @@ def run(test, params, env):
         cmd = params.get("nic_module_cmd")
         out = session.cmd(cmd)
         for module in out.split("\n"):
-            if not cmd in module:
+            if cmd not in module:
                 modules.append(module.split("/")[-1])
         modules.remove("")
         return set(modules)
diff --git a/generic/tests/pxe_boot.py b/generic/tests/pxe_boot.py
index 865c6c38280b95f8b62cf5d03ccf60a95629fa5a..aad6ad2039755a60a53e382ec7d8d81571d07209 100644
--- a/generic/tests/pxe_boot.py
+++ b/generic/tests/pxe_boot.py
@@ -26,7 +26,7 @@ def run(test, params, env):
                             logging.debug, "(pxe capture) ", timeout)[1]
 
     error.context("Analyzing the tcpdump result", logging.info)
-    if not "tftp" in output:
+    if "tftp" not in output:
         raise error.TestFail(
             "Couldn't find any TFTP packets after %s seconds" %
             timeout)
diff --git a/qemu/tests/cpuflags.py b/qemu/tests/cpuflags.py
index 4bac2244f893042457136b64281987e1eb567710..b4b1847150b714ae6072c978ed583904c356d53a 100644
--- a/qemu/tests/cpuflags.py
+++ b/qemu/tests/cpuflags.py
@@ -517,7 +517,7 @@ def run(test, params, env):
                 missing = []
                 cpu_models = map(separe_cpu_model, cpu_models)
                 for cpu_model in cpu_models:
-                    if not cpu_model in result.stdout:
+                    if cpu_model not in result.stdout:
                         missing.append(cpu_model)
                 if missing:
                     raise error.TestFail("CPU models %s are not in output "
@@ -537,7 +537,7 @@ def run(test, params, env):
                 cpu_models = map(separe_cpu_model, cpu_models)
                 missing = []
                 for cpu_model in cpu_models:
-                    if not cpu_model in result.stdout:
+                    if cpu_model not in result.stdout:
                         missing.append(cpu_model)
                 if missing:
                     raise error.TestFail("CPU models %s are not in output "
diff --git a/qemu/tests/cpuinfo_query.py b/qemu/tests/cpuinfo_query.py
index c80d8f914f71d96d1839c95556c46b574afcdd5c..fccf991c3401cf28c88c9d2e4e1050602f0dfe71 100644
--- a/qemu/tests/cpuinfo_query.py
+++ b/qemu/tests/cpuinfo_query.py
@@ -26,7 +26,7 @@ def run(test, params, env):
     cpuinfos = params.get("cpu_info", "Conroe").split(",")
     missing = []
     for cpuinfo in cpuinfos:
-        if not cpuinfo in output:
+        if cpuinfo not in output:
             missing.append(cpuinfo)
     if missing:
         raise error.TestFail("%s is missing in the output\n %s" %
diff --git a/qemu/tests/floppy.py b/qemu/tests/floppy.py
index 3d4a92ffedfb905f9fa821ab3cb12fbcc2c68c8d..11e4f9c9fb1cb13da0fa484b22720724941bc5fb 100644
--- a/qemu/tests/floppy.py
+++ b/qemu/tests/floppy.py
@@ -112,7 +112,7 @@ def run(test, params, env):
             # needs time to load and init floppy driver
             if self.dest_dir:
                 lsmod = self.session.cmd("lsmod")
-                if not 'floppy' in lsmod:
+                if 'floppy' not in lsmod:
                     self.session.cmd("modprobe floppy")
             else:
                 time.sleep(20)
@@ -234,7 +234,7 @@ def run(test, params, env):
                 error.context("Prepare floppy for writing.")
                 if self.mount_dir:
                     lsmod = session.cmd("lsmod")
-                    if not 'floppy' in lsmod:
+                    if 'floppy' not in lsmod:
                         session.cmd("modprobe floppy")
                 else:
                     time.sleep(20)
@@ -265,7 +265,7 @@ def run(test, params, env):
                 error.context("Wait for copy finishing.")
                 status = int(session.cmd_status("kill %s" % pid,
                                                 timeout=copy_timeout))
-                if not status in [0]:
+                if status not in [0]:
                     raise error.TestFail("Copy process was terminatted with"
                                          " error code %s" % (status))
 
@@ -338,12 +338,12 @@ def run(test, params, env):
                 error.context("Prepare floppy for writing.")
                 if self.mount_dir:   # If linux
                     lsmod = session.cmd("lsmod")
-                    if not 'floppy' in lsmod:
+                    if 'floppy' not in lsmod:
                         session.cmd("modprobe floppy")
                 else:
                     time.sleep(20)
 
-                if not floppy in vm.monitor.info("block"):
+                if floppy not in vm.monitor.info("block"):
                     raise error.TestFail("Wrong floppy image is placed in vm.")
 
                 try:
@@ -387,7 +387,7 @@ def run(test, params, env):
                     session.cmd("mount -t vfat %s %s" % (guest_floppy_path,
                                                          self.mount_dir), timeout=30)
 
-                if not second_floppy in vm.monitor.info("block"):
+                if second_floppy not in vm.monitor.info("block"):
                     raise error.TestFail("Wrong floppy image is placed in vm.")
 
             sync = SyncData(self.mig.master_id(), self.mig.hostid,
diff --git a/qemu/tests/migration_multi_host_downtime_and_speed.py b/qemu/tests/migration_multi_host_downtime_and_speed.py
index 0876d8516b6a42326a2aab77c6d9104b8dc9f03b..79d702c448d7097168eb4fc36fdbd62a3ffa3a03 100644
--- a/qemu/tests/migration_multi_host_downtime_and_speed.py
+++ b/qemu/tests/migration_multi_host_downtime_and_speed.py
@@ -68,7 +68,7 @@ def run(test, params, env):
                     ret = s.get("migrated") == "true"
             o = vm.monitor.info("migrate")
             if isinstance(o, str):
-                return ret and (not "status: active" in o)
+                return ret and ("status: active" not in o)
             else:
                 return ret and (o.get("status") != "active")
 
diff --git a/qemu/tests/migration_multi_host_firewall_block.py b/qemu/tests/migration_multi_host_firewall_block.py
index 2598d622c1d9781c1e2f9ac3bedb00866ea1eae3..735bf1d6c57e90319adc9ec3bfa1930593f2ef56 100644
--- a/qemu/tests/migration_multi_host_firewall_block.py
+++ b/qemu/tests/migration_multi_host_firewall_block.py
@@ -39,7 +39,7 @@ def run(test, params, env):
                     ret = s.get("migrated") == "true"
             o = vm.monitor.info("migrate")
             if isinstance(o, str):
-                return ret and (not "status: active" in o)
+                return ret and ("status: active" not in o)
             else:
                 return ret and (o.get("status") != "active")
 
diff --git a/qemu/tests/migration_multi_host_timedrift.py b/qemu/tests/migration_multi_host_timedrift.py
index d27e78a7f15bac0bc523c0a85a0220a38a5eb546..579a13beaae370dc41b4c614fe4fd0a98f271e8b 100644
--- a/qemu/tests/migration_multi_host_timedrift.py
+++ b/qemu/tests/migration_multi_host_timedrift.py
@@ -61,7 +61,7 @@ def run(test, params, env):
                                                self.time_filter_re,
                                                self.time_format)
                 session.cmd(self.create_file)
-                if not vm.name in self.start_ht.keys():
+                if vm.name not in self.start_ht.keys():
                     (self.start_ht[vm.name], self.start_gt[vm.name]) = (ht, gt)
                     if abs(ht - gt) > self.diff_limit:
                         logging.warning("Host and %s time diff %s is greater "
diff --git a/qemu/tests/migration_multi_host_with_speed_measurement.py b/qemu/tests/migration_multi_host_with_speed_measurement.py
index e1250fa067466d7c0936623d40b552e0296f1203..0c92ef1e48c232a8289c207f8a5af6fd1103d4d3 100644
--- a/qemu/tests/migration_multi_host_with_speed_measurement.py
+++ b/qemu/tests/migration_multi_host_with_speed_measurement.py
@@ -59,7 +59,7 @@ def run(test, params, env):
             fail_msg = ("Could not determine the transferred memory from"
                         " monitor data: %s" % o)
             if isinstance(o, str):
-                if not "status: active" in o:
+                if "status: active" not in o:
                     raise error.TestWarn(warning_msg)
                 try:
                     transfered_mem = int(get_mig_speed.search(o).groups()[0])
diff --git a/qemu/tests/migration_with_dst_problem.py b/qemu/tests/migration_with_dst_problem.py
index 4ead5ff65af9f89f1b5dcffac140bbc91fa874ae..111d55d2bd2e948a942eb575d2a040f5379b3053 100644
--- a/qemu/tests/migration_with_dst_problem.py
+++ b/qemu/tests/migration_with_dst_problem.py
@@ -260,7 +260,7 @@ def run(test, params, env):
             session.cmd("dd if=/dev/zero of=%s bs=1M count=%s" % (disk_path,
                                                                   disk_size))
             status, output = session.cmd_status_output("setenforce 0")
-            if not status in [0, 127]:
+            if status not in [0, 127]:
                 logging.warn("Function setenforce fails.\n %s" % (output))
 
             config = self.config % (self.server_name, disk_path,
diff --git a/qemu/tests/migration_with_speed_measurement.py b/qemu/tests/migration_with_speed_measurement.py
index 7431bd22ccee19a957d28c514180822c81e5f711..ebc6e11bf012707cbb53e2f98d36f1d7450ac366 100644
--- a/qemu/tests/migration_with_speed_measurement.py
+++ b/qemu/tests/migration_with_speed_measurement.py
@@ -56,7 +56,7 @@ def run(test, params, env):
             fail_msg = ("Could not determine the transferred memory from"
                         " monitor data: %s" % o)
             if isinstance(o, str):
-                if not "status: active" in o:
+                if "status: active" not in o:
                     raise error.TestWarn(warning_msg)
                 try:
                     transfered_mem = int(get_mig_speed.search(o).groups()[0])
diff --git a/qemu/tests/mq_change_qnum.py b/qemu/tests/mq_change_qnum.py
index 1651a9bf05a5ab85f5e871c1d006c834cf7c822b..6145baed9cd341803d356b790c58b8481a5e587f 100644
--- a/qemu/tests/mq_change_qnum.py
+++ b/qemu/tests/mq_change_qnum.py
@@ -96,7 +96,7 @@ def run(test, params, env):
         error.context("Change queues number repeatly", logging.info)
         repeat_counts = int(params.get("repeat_counts", 10))
         for nic_index, nic in enumerate(vm.virtnet):
-            if not "virtio" in nic['nic_model']:
+            if "virtio" not in nic['nic_model']:
                 continue
             queues = int(vm.virtnet[nic_index].queues)
             if queues == 1:
diff --git a/qemu/tests/pci_hotplug.py b/qemu/tests/pci_hotplug.py
index 253e605b3655bec69d478c6a627985c7a319454b..b082f2474042bb042024420bf521852b5d9bf765 100644
--- a/qemu/tests/pci_hotplug.py
+++ b/qemu/tests/pci_hotplug.py
@@ -44,7 +44,7 @@ def run(test, params, env):
         add_output = vm.monitor.send_args_cmd(pci_add_cmd, convert=False)
         pci_info.append(['', '', add_output, pci_model])
 
-        if not "OK domain" in add_output:
+        if "OK domain" not in add_output:
             raise error.TestFail("Add PCI device failed. "
                                  "Monitor command is: %s, Output: %r" %
                                  (pci_add_cmd, add_output))
diff --git a/qemu/tests/pci_hotplug_check.py b/qemu/tests/pci_hotplug_check.py
index c085b6ef502043efec164a21eec3bc796b4043c1..4bc3bfc3c53a039f2e4a08abe65c7db753955d46 100644
--- a/qemu/tests/pci_hotplug_check.py
+++ b/qemu/tests/pci_hotplug_check.py
@@ -86,7 +86,7 @@ def run(test, params, env):
         add_output = vm.monitor.send_args_cmd(pci_add_cmd, convert=False)
         guest_device = find_new_device(chk_cmd, guest_devices)
         pci_info.append(['', '', add_output, pci_model, guest_device])
-        if not "OK domain" in add_output:
+        if "OK domain" not in add_output:
             raise error.TestFail("Add PCI device failed. "
                                  "Monitor command is: %s, Output: %r" %
                                  (pci_add_cmd, add_output))
diff --git a/qemu/tests/physical_resources_check.py b/qemu/tests/physical_resources_check.py
index df6a5a72d527ed33f47869543b4eae19f104b115..1e909f54ca285017460aa6301475d58d512daad9 100644
--- a/qemu/tests/physical_resources_check.py
+++ b/qemu/tests/physical_resources_check.py
@@ -271,7 +271,7 @@ def run(test, params, env):
     if expected_vendor_id and cpu_vendor_id_chk_cmd:
         output = session.cmd_output(cpu_vendor_id_chk_cmd)
 
-        if not expected_vendor_id in output:
+        if expected_vendor_id not in output:
             fail_log = "CPU vendor id check failed.\n"
             fail_log += "    Assigned to VM: '%s'\n" % expected_vendor_id
             fail_log += "    Reported by OS: '%s'" % output
@@ -333,7 +333,7 @@ def run(test, params, env):
     num_nics = len(params.objects("nics"))
     for nic_index in range(num_nics):
         mac = vm.get_mac_address(nic_index)
-        if not string.lower(mac) in found_mac_addresses:
+        if string.lower(mac) not in found_mac_addresses:
             fail_log = "MAC address mismatch:\n"
             fail_log += "    Assigned to VM (not found): %s" % mac
             n_fail.append(fail_log)
diff --git a/qemu/tests/qemu_img.py b/qemu/tests/qemu_img.py
index 98fc7e307edec8f354af512ba6a90218e2c41f0c..58b6738b6f7a0682f2eabf69d027174ae36df9d9 100644
--- a/qemu/tests/qemu_img.py
+++ b/qemu/tests/qemu_img.py
@@ -240,10 +240,10 @@ def run(test, params, env):
         """
         img_info = _info(cmd, image_name)
         logging.info("Info of image '%s':\n%s", image_name, img_info)
-        if not image_format in img_info:
+        if image_format not in img_info:
             raise error.TestFail("Got unexpected format of image '%s'"
                                  " in info test" % image_name)
-        if not image_size in img_info:
+        if image_size not in img_info:
             raise error.TestFail("Got unexpected size of image '%s'"
                                  " in info test" % image_name)
 
@@ -424,7 +424,7 @@ def run(test, params, env):
 
         :param cmd: qemu-img base command.
         """
-        if not 'rebase' in utils.system_output(cmd + ' --help',
+        if 'rebase' not in utils.system_output(cmd + ' --help',
                                                ignore_status=True):
             raise error.TestNAError("Current kvm user space version does not"
                                     " support 'rebase' subcommand")
@@ -453,7 +453,7 @@ def run(test, params, env):
         # Check sn2's format and backing_file
         actual_base_img = _info(cmd, sn2, "backing file")
         base_img_name = os.path.basename(base_img)
-        if not base_img_name in actual_base_img:
+        if base_img_name not in actual_base_img:
             raise error.TestFail("After rebase the backing_file of 'sn2' is "
                                  "'%s' which is not expected as '%s'"
                                  % (actual_base_img, base_img_name))
diff --git a/qemu/tests/qmp_basic.py b/qemu/tests/qmp_basic.py
index 95f882945e0c039888588ad6c219ac04cb9fd566..06d7bbb84b50b70a298dc156166437b2319a87df 100644
--- a/qemu/tests/qmp_basic.py
+++ b/qemu/tests/qmp_basic.py
@@ -34,7 +34,7 @@ def run(test, params, env):
         if not isinstance(qmp_dict, dict):
             raise error.TestFail("qmp_dict is not a dict (it's '%s')" %
                                  type(qmp_dict))
-        if not key in qmp_dict:
+        if key not in qmp_dict:
             raise error.TestFail("'%s' key doesn't exist in dict ('%s')" %
                                  (key, str(qmp_dict)))
 
diff --git a/qemu/tests/qmp_basic_rhel6.py b/qemu/tests/qmp_basic_rhel6.py
index 8fa39ba41009f27ec3922e604cbca2cffb779ca5..9b39467ffcca2b5ddfe707dcf7cea1430f64316a 100644
--- a/qemu/tests/qmp_basic_rhel6.py
+++ b/qemu/tests/qmp_basic_rhel6.py
@@ -35,7 +35,7 @@ def run(test, params, env):
         if not isinstance(qmp_dict, dict):
             raise error.TestFail("qmp_dict is not a dict (it's '%s')" %
                                  type(qmp_dict))
-        if not key in qmp_dict:
+        if key not in qmp_dict:
             raise error.TestFail("'%s' key doesn't exist in dict ('%s')" %
                                  (key, str(qmp_dict)))
 
diff --git a/qemu/tests/rv_input.py b/qemu/tests/rv_input.py
index 22b6757ad7f11bea5196c4ef1a336284612eed96..609364e5eb2106de03c52858dd68f52de2cbf92b 100644
--- a/qemu/tests/rv_input.py
+++ b/qemu/tests/rv_input.py
@@ -94,7 +94,7 @@ def test_type_and_func_keys(client_vm, guest_session, params):
     logging.info("Sending typewriter and functional keys to client machine")
     for i in range(1, 69):
         # Avoid Ctrl, RSH, LSH, PtScr, Alt, CpsLk
-        if not (i in [29, 42, 54, 55, 56, 58]):
+        if i not in [29, 42, 54, 55, 56, 58]:
             client_vm.send_key(str(hex(i)))
             utils_spice.wait_timeout(0.3)
 
diff --git a/qemu/tests/rv_smartcard.py b/qemu/tests/rv_smartcard.py
index 32f638817437ae3470fe991bb06ae9379e32ede1..82db05dd0a8ed74f9088efaf5425d5b22b788055 100644
--- a/qemu/tests/rv_smartcard.py
+++ b/qemu/tests/rv_smartcard.py
@@ -84,8 +84,8 @@ def run(test, params, env):
                 raise error.TestFail("Certificate %s was not found as a listed"
                                      " cert in the guest" % subj_string)
     elif smartcard_testtype == "pklogin_finder":
-               # pkcs11_listcerts not installed until
-               # Smart Card Support is installed
+        # pkcs11_listcerts not installed until
+        # Smart Card Support is installed
         try:
             certsinfo_output = guest_session.cmd("pklogin_finder debug")
         except aexpect.ShellTimeoutError:
diff --git a/qemu/tests/sr_iov_hotplug.py b/qemu/tests/sr_iov_hotplug.py
index f57a6b0878ac98bd4a40120142b89d3aee65dd72..c9260ed471fb56e67af6631d0cf14477639fdde5 100644
--- a/qemu/tests/sr_iov_hotplug.py
+++ b/qemu/tests/sr_iov_hotplug.py
@@ -51,7 +51,7 @@ def run(test, params, env):
         error.context("Adding pci device with command 'pci_add'")
         add_output = vm.monitor.send_args_cmd(pci_add_cmd, convert=False)
         pci_info.append(['', add_output])
-        if not "OK domain" in add_output:
+        if "OK domain" not in add_output:
             raise error.TestFail("Add PCI device failed. "
                                  "Monitor command is: %s, Output: %r" %
                                  (pci_add_cmd, add_output))
diff --git a/qemu/tests/timedrift_adjust_time.py b/qemu/tests/timedrift_adjust_time.py
index 0b0f26de1711d0d197caac7ff16f91ee9608224f..54bed783ff3b8f64c6e066ac0bd6de8c76157e91 100644
--- a/qemu/tests/timedrift_adjust_time.py
+++ b/qemu/tests/timedrift_adjust_time.py
@@ -149,7 +149,7 @@ class TimedriftTest(object):
         read_clock_cmd = "cat /sys/devices/system/clocksource/"
         read_clock_cmd += "clocksource0/current_clocksource"
         current_clocksource = session.cmd_output(read_clock_cmd)
-        if not clock_source in current_clocksource:
+        if clock_source not in current_clocksource:
             raise error.TestFail("Guest didn't use'%s'" % clock_source +
                                  "clocksource, current clocksoure " +
                                  "is %s;" % current_clocksource)
diff --git a/qemu/tests/timedrift_no_net.py b/qemu/tests/timedrift_no_net.py
index 0dd05aa79fcde365f359f34e18165326a5d8d7de..fcd64f92b33d91ad6f282556b2c76cdc530547ee 100644
--- a/qemu/tests/timedrift_no_net.py
+++ b/qemu/tests/timedrift_no_net.py
@@ -120,7 +120,7 @@ def run(test, params, env):
     session = vm.wait_for_serial_login(timeout=login_timeout)
     out = session.cmd_output("cat /sys/devices/system/clocksource/"
                              "clocksource0/current_clocksource")
-    if not guest_clock_source in out:
+    if guest_clock_source not in out:
         raise error.TestFail("Clock source %s missing in guest clock "
                              "sources %s." % (guest_clock_source, out))
 
diff --git a/qemu/tests/timerdevice_boot.py b/qemu/tests/timerdevice_boot.py
index 5bf21175a4f7726b0831928123e20bf3a0e5c0ed..159f464384017629c5d518fa169fd5b16aeeabc0 100644
--- a/qemu/tests/timerdevice_boot.py
+++ b/qemu/tests/timerdevice_boot.py
@@ -32,7 +32,7 @@ def run(test, params, env):
         error.context("Check the current clocksource in guest", logging.info)
         cmd = "cat /sys/devices/system/clocksource/"
         cmd += "clocksource0/current_clocksource"
-        if not expected in session.cmd(cmd):
+        if expected not in session.cmd(cmd):
             raise error.TestFail(
                 "Guest didn't use '%s' clocksource" % expected)
 
diff --git a/qemu/tests/timerdevice_change_guest_clksource.py b/qemu/tests/timerdevice_change_guest_clksource.py
index 5e83add6c5b7e02a3aa8eef691b60326393e06c2..5be7928a95dc0b4c748b912b63bf5a006f692b68 100644
--- a/qemu/tests/timerdevice_change_guest_clksource.py
+++ b/qemu/tests/timerdevice_change_guest_clksource.py
@@ -24,7 +24,7 @@ def run(test, params, env):
         error.context("Check the current clocksource in guest", logging.info)
         cmd = "cat /sys/devices/system/clocksource/"
         cmd += "clocksource0/current_clocksource"
-        if not expected in session.cmd(cmd):
+        if expected not in session.cmd(cmd):
             raise error.TestFail(
                 "Guest didn't use '%s' clocksource" % expected)
 
@@ -38,7 +38,7 @@ def run(test, params, env):
     error.context("Check the current clocksource in guest", logging.info)
     cmd = "cat /sys/devices/system/clocksource/"
     cmd += "clocksource0/current_clocksource"
-    if not "kvm-clock" in session.cmd(cmd):
+    if "kvm-clock" not in session.cmd(cmd):
         grub_file = params.get("grub_file", "/boot/grub2/grub.cfg")
         if "clocksource=" not in session.cmd("cat %s" % grub_file):
             raise error.TestFail("Guest didn't use 'kvm-clock' clocksource")
diff --git a/qemu/tests/timerdevice_clock_drift_with_ntp.py b/qemu/tests/timerdevice_clock_drift_with_ntp.py
index d6a3de2b737c41a999184db57a942c60b33b5f24..c63e43853a8ebf7df32680d9171b18643f2935d6 100644
--- a/qemu/tests/timerdevice_clock_drift_with_ntp.py
+++ b/qemu/tests/timerdevice_clock_drift_with_ntp.py
@@ -36,7 +36,7 @@ def run(test, params, env):
     error.context("Check for an appropriate clocksource on host", logging.info)
     host_cmd = "cat /sys/devices/system/clocksource/"
     host_cmd += "clocksource0/current_clocksource"
-    if not "tsc" in utils.system_output(host_cmd):
+    if "tsc" not in utils.system_output(host_cmd):
         raise error.TestNAError("Host must use 'tsc' clocksource")
 
     error.context("Boot the guest", logging.info)
diff --git a/qemu/tests/timerdevice_clock_drift_with_sleep.py b/qemu/tests/timerdevice_clock_drift_with_sleep.py
index 4548bc14e14e9e282bf6dc4a98394801e4f01cfd..d0c000029c745cf5187a5725a56fa86223171e8f 100644
--- a/qemu/tests/timerdevice_clock_drift_with_sleep.py
+++ b/qemu/tests/timerdevice_clock_drift_with_sleep.py
@@ -53,7 +53,7 @@ def run(test, params, env):
                   logging.info)
     cmd = "cat /sys/devices/system/clocksource/"
     cmd += "clocksource0/current_clocksource"
-    if not "kvm-clock" in session.cmd(cmd):
+    if "kvm-clock" not in session.cmd(cmd):
         grub_file = params.get("grub_file", "/boot/grub2/grub.cfg")
         if "clocksource=" not in session.cmd("cat %s" % grub_file):
             raise error.TestFail("Guest didn't use 'kvm-clock' clocksource")
diff --git a/qemu/tests/timerdevice_tscsync_change_host_clksource.py b/qemu/tests/timerdevice_tscsync_change_host_clksource.py
index d4a94a0f752f34cb7564c1827b197c21c754eb46..8ea018d324f7313e285a48b5e2b1bc447ff6f24e 100644
--- a/qemu/tests/timerdevice_tscsync_change_host_clksource.py
+++ b/qemu/tests/timerdevice_tscsync_change_host_clksource.py
@@ -27,7 +27,7 @@ def run(test, params, env):
     error.context("Check for an appropriate clocksource on host", logging.info)
     host_cmd = "cat /sys/devices/system/clocksource/"
     host_cmd += "clocksource0/current_clocksource"
-    if not "tsc" in utils.system_output(host_cmd):
+    if "tsc" not in utils.system_output(host_cmd):
         raise error.TestNAError("Host must use 'tsc' clocksource")
 
     error.context("Boot the guest with one cpu socket", logging.info)
@@ -40,7 +40,7 @@ def run(test, params, env):
     error.context("Check the guest is using vsyscall", logging.info)
     date_cmd = "strace date 2>&1|egrep 'clock_gettime|gettimeofday'|wc -l"
     output = session.cmd(date_cmd)
-    if not '0' in output:
+    if '0' not in output:
         raise error.TestFail("Failed to check vsyscall. Output: '%s'" % output)
 
     error.context("Copy time-warp-test.c to guest", logging.info)
@@ -99,7 +99,7 @@ def run(test, params, env):
                                  " Output (last 5 lines): '%s'" % msg)
 
         output = session.cmd(date_cmd)
-        if not "1" in output:
+        if "1" not in output:
             raise error.TestFail("Failed to check vsyscall."
                                  " Output: '%s'" % output)
     finally:
diff --git a/qemu/tests/timerdevice_tscsync_longtime.py b/qemu/tests/timerdevice_tscsync_longtime.py
index 47cc6594c4a27887293c0df6fb9c74e02f9c624d..b9ea37d1402fc57e0eef2b964218f1c9783ec7be 100644
--- a/qemu/tests/timerdevice_tscsync_longtime.py
+++ b/qemu/tests/timerdevice_tscsync_longtime.py
@@ -25,7 +25,7 @@ def run(test, params, env):
     error.context("Check for an appropriate clocksource on host", logging.info)
     host_cmd = "cat /sys/devices/system/clocksource/"
     host_cmd += "clocksource0/current_clocksource"
-    if not "tsc" in utils.system_output(host_cmd):
+    if "tsc" not in utils.system_output(host_cmd):
         raise error.TestNAError("Host must use 'tsc' clocksource")
 
     error.context("Check host has more than one cpu socket", logging.info)
diff --git a/qemu/tests/timerdevice_tscwrite.py b/qemu/tests/timerdevice_tscwrite.py
index c7d3a3f292c5a89e3341d7c29847af7abf0e1954..b897d4bb53f99b5272d51fb7a87e6209f7048b47 100644
--- a/qemu/tests/timerdevice_tscwrite.py
+++ b/qemu/tests/timerdevice_tscwrite.py
@@ -20,7 +20,7 @@ def run(test, params, env):
     error.context("Check for an appropriate clocksource on host", logging.info)
     host_cmd = "cat /sys/devices/system/clocksource/"
     host_cmd += "clocksource0/current_clocksource"
-    if not "tsc" in utils.system_output(host_cmd):
+    if "tsc" not in utils.system_output(host_cmd):
         raise error.TestNAError("Host must use 'tsc' clocksource")
 
     error.context("Boot the guest", logging.info)
@@ -40,7 +40,7 @@ def run(test, params, env):
 
     date_cmd = "strace date 2>&1 | egrep 'clock_gettime|gettimeofday' | wc -l"
     output = session.cmd(date_cmd)
-    if not '0' in output:
+    if '0' not in output:
         raise error.TestFail("Test failed before run msr tools."
                              " Output: '%s'" % output)
 
@@ -51,6 +51,6 @@ def run(test, params, env):
     session.cmd(cmd)
 
     output = session.cmd(date_cmd)
-    if not "1" in output:
+    if "1" not in output:
         raise error.TestFail("Test failed after run msr tools."
                              " Output: '%s'" % output)
diff --git a/qemu/tests/usb_storage.py b/qemu/tests/usb_storage.py
index f96c954a5fafc95a879893d5b86704317eb1efb8..b39bfec12e77e8d1c3c22643cc386d3a20f81efa 100644
--- a/qemu/tests/usb_storage.py
+++ b/qemu/tests/usb_storage.py
@@ -115,7 +115,7 @@ def run(test, params, env):
         error.context("Check serial option in guest", logging.info)
         session = _login()
         output = session.cmd("lsusb -v")
-        if not ("EMPTY_STRING" in serial or "NO_EQUAL_STRING" in serial):
+        if "EMPTY_STRING" not in serial or "NO_EQUAL_STRING" not in serial:
             # Verify in guest when serial is set to empty/null is meaningless.
             _verify_string(serial, output, [serial])
         _do_io_test_guest(session)