diff --git a/tempest/api/compute/admin/test_hypervisor.py b/tempest/api/compute/admin/test_hypervisor.py
index 4637024..e0e5a29 100644
--- a/tempest/api/compute/admin/test_hypervisor.py
+++ b/tempest/api/compute/admin/test_hypervisor.py
@@ -104,7 +104,7 @@
             try:
                 uptime = (self.client.show_hypervisor_uptime(hyper['id'])
                           ['hypervisor'])
-                if len(uptime) > 0:
+                if uptime:
                     has_valid_uptime = True
                     break
             except Exception:
diff --git a/tempest/api/compute/servers/test_novnc.py b/tempest/api/compute/servers/test_novnc.py
index 6354c57..90b0665 100644
--- a/tempest/api/compute/servers/test_novnc.py
+++ b/tempest/api/compute/servers/test_novnc.py
@@ -82,7 +82,7 @@
         """Verify we can connect to novnc and do the websocket connection."""
         # Turn the Socket into a WebSocket to do the communication
         data = self._websocket.receive_frame()
-        self.assertFalse(data is None or len(data) == 0,
+        self.assertFalse(data is None or not data,
                          'Token must be invalid because the connection '
                          'closed.')
         # Parse the RFB version from the data to make sure it is valid
@@ -181,6 +181,6 @@
         self._websocket = compute.create_websocket(url)
         # Make sure the novncproxy rejected the connection and closed it
         data = self._websocket.receive_frame()
-        self.assertTrue(data is None or len(data) == 0,
+        self.assertTrue(data is None or not data,
                         "The novnc proxy actually sent us some data, but we "
                         "expected it to close the connection.")
diff --git a/tempest/api/compute/test_extensions.py b/tempest/api/compute/test_extensions.py
index f87bf6d..3b41775 100644
--- a/tempest/api/compute/test_extensions.py
+++ b/tempest/api/compute/test_extensions.py
@@ -31,7 +31,7 @@
     @decorators.idempotent_id('3bb27738-b759-4e0d-a5fa-37d7a6df07d1')
     def test_list_extensions(self):
         # List of all extensions
-        if len(CONF.compute_feature_enabled.api_extensions) == 0:
+        if not CONF.compute_feature_enabled.api_extensions:
             raise self.skipException('There are not any extensions configured')
         extensions = self.extensions_client.list_extensions()['extensions']
         ext = CONF.compute_feature_enabled.api_extensions[0]
diff --git a/tempest/api/identity/base.py b/tempest/api/identity/base.py
index 9d794b5..06cc120 100644
--- a/tempest/api/identity/base.py
+++ b/tempest/api/identity/base.py
@@ -47,7 +47,7 @@
         else:
             users = cls.users_client.list_users()['users']
         user = [u for u in users if u['name'] == name]
-        if len(user) > 0:
+        if user:
             return user[0]
 
     @classmethod
@@ -57,14 +57,14 @@
         except AttributeError:
             tenants = cls.projects_client.list_projects()['projects']
         tenant = [t for t in tenants if t['name'] == name]
-        if len(tenant) > 0:
+        if tenant:
             return tenant[0]
 
     @classmethod
     def get_role_by_name(cls, name):
         roles = cls.roles_client.list_roles()['roles']
         role = [r for r in roles if r['name'] == name]
-        if len(role) > 0:
+        if role:
             return role[0]
 
     def create_test_user(self, **kwargs):
diff --git a/tempest/api/network/base.py b/tempest/api/network/base.py
index a724dc9..7ceeb50 100644
--- a/tempest/api/network/base.py
+++ b/tempest/api/network/base.py
@@ -106,7 +106,7 @@
 
             # Clean up metering label rules
             # Not all classes in the hierarchy have the client class variable
-            if len(cls.metering_label_rules) > 0:
+            if cls.metering_label_rules:
                 label_rules_client = cls.admin_metering_label_rules_client
                 for metering_label_rule in cls.metering_label_rules:
                     test_utils.call_and_ignore_notfound_exc(
diff --git a/tempest/api/volume/test_extensions.py b/tempest/api/volume/test_extensions.py
index 91bfa33..39ce00c 100644
--- a/tempest/api/volume/test_extensions.py
+++ b/tempest/api/volume/test_extensions.py
@@ -32,7 +32,7 @@
         # List of all extensions
         extensions = (self.volumes_extension_client.list_extensions()
                       ['extensions'])
-        if len(CONF.volume_feature_enabled.api_extensions) == 0:
+        if not CONF.volume_feature_enabled.api_extensions:
             raise self.skipException('There are not any extensions configured')
         extension_list = [extension.get('alias') for extension in extensions]
         LOG.debug("Cinder extensions: %s", ','.join(extension_list))
diff --git a/tempest/api/volume/test_volumes_list.py b/tempest/api/volume/test_volumes_list.py
index ea9ddca..9787160 100644
--- a/tempest/api/volume/test_volumes_list.py
+++ b/tempest/api/volume/test_volumes_list.py
@@ -46,7 +46,7 @@
             fetched_list = [fieldsgetter(item) for item in fetched_list]
 
         missing_vols = [v for v in expected_list if v not in fetched_list]
-        if len(missing_vols) == 0:
+        if not missing_vols:
             return
 
         def str_vol(vol):
diff --git a/tempest/cmd/cleanup_service.py b/tempest/cmd/cleanup_service.py
index a632726..f1c0a3e 100644
--- a/tempest/cmd/cleanup_service.py
+++ b/tempest/cmd/cleanup_service.py
@@ -105,7 +105,7 @@
 
     def _filter_by_tenant_id(self, item_list):
         if (item_list is None
-                or len(item_list) == 0
+                or not item_list
                 or not hasattr(self, 'tenant_id')
                 or self.tenant_id is None
                 or 'tenant_id' not in item_list[0]):
diff --git a/tempest/common/compute.py b/tempest/common/compute.py
index 38daffe..9587ffe 100644
--- a/tempest/common/compute.py
+++ b/tempest/common/compute.py
@@ -258,7 +258,7 @@
         while True:
             header = self._socket.recv(2)
             # If we didn't receive any data, just return None
-            if len(header) == 0:
+            if not header:
                 return None
             # We will make the assumption that we are only dealing with
             # frames less than 125 bytes here (for the negotiation) and
@@ -313,6 +313,6 @@
         self._socket.sendall(reqdata.encode('utf8'))
         self.response = data = self._socket.recv(4096)
         # Loop through & concatenate all of the data in the response body
-        while len(data) > 0 and self.response.find(b'\r\n\r\n') < 0:
+        while data and self.response.find(b'\r\n\r\n') < 0:
             data = self._socket.recv(4096)
             self.response += data
diff --git a/tempest/common/preprov_creds.py b/tempest/common/preprov_creds.py
index a92d16a..8053cac 100644
--- a/tempest/common/preprov_creds.py
+++ b/tempest/common/preprov_creds.py
@@ -241,7 +241,7 @@
 
     def _get_creds(self, roles=None):
         useable_hashes = self._get_match_hash_list(roles)
-        if len(useable_hashes) == 0:
+        if not useable_hashes:
             msg = 'No users configured for type/roles %s' % roles
             raise lib_exc.InvalidCredentials(msg)
         free_hash = self._get_free_hash(useable_hashes)
diff --git a/tempest/lib/auth.py b/tempest/lib/auth.py
index 83aa405..ab4308f 100644
--- a/tempest/lib/auth.py
+++ b/tempest/lib/auth.py
@@ -539,18 +539,18 @@
 
         # Select entries with matching service type
         service_catalog = [ep for ep in catalog if ep['type'] == service]
-        if len(service_catalog) > 0:
+        if service_catalog:
             if name is not None:
                 service_catalog = (
                     [ep for ep in service_catalog if ep['name'] == name])
-                if len(service_catalog) > 0:
+                if service_catalog:
                     service_catalog = service_catalog[0]['endpoints']
                 else:
                     raise exceptions.EndpointNotFound(name)
             else:
                 service_catalog = service_catalog[0]['endpoints']
         else:
-            if len(catalog) == 0 and service == 'identity':
+            if not catalog and service == 'identity':
                 # NOTE(andreaf) If there's no catalog at all and the service
                 # is identity, it's a valid use case. Having a non-empty
                 # catalog with no identity in it is not valid instead.
@@ -571,13 +571,13 @@
         # Filter by endpoint type (interface)
         filtered_catalog = [ep for ep in service_catalog if
                             ep['interface'] == endpoint_type]
-        if len(filtered_catalog) == 0:
+        if not filtered_catalog:
             # No matching type, keep all and try matching by region at least
             filtered_catalog = service_catalog
         # Filter by region
         filtered_catalog = [ep for ep in filtered_catalog if
                             ep['region'] == region]
-        if len(filtered_catalog) == 0:
+        if not filtered_catalog:
             # No matching region (or name), take the first endpoint
             filtered_catalog = [service_catalog[0]]
         # There should be only one match. If not take the first.
diff --git a/tempest/lib/cli/output_parser.py b/tempest/lib/cli/output_parser.py
index 716f374..2edd5c1 100644
--- a/tempest/lib/cli/output_parser.py
+++ b/tempest/lib/cli/output_parser.py
@@ -114,7 +114,7 @@
                 label = line
             else:
                 LOG.warning('Invalid line between tables: %s', line)
-    if len(table_) > 0:
+    if table_:
         LOG.warning('Missing end of table')
 
     return tables_
diff --git a/tempest/lib/exceptions.py b/tempest/lib/exceptions.py
index dea3289..68ce57a 100644
--- a/tempest/lib/exceptions.py
+++ b/tempest/lib/exceptions.py
@@ -32,7 +32,7 @@
         except Exception:
             # at least get the core message out if something happened
             self._error_string = self.message
-        if len(args) > 0:
+        if args:
             # If there is a non-kwarg parameter, assume it's the error
             # message or reason description and tack it on to the end
             # of the exception message
diff --git a/tempest/lib/services/clients.py b/tempest/lib/services/clients.py
index 1c8f443..cd3bab0 100644
--- a/tempest/lib/services/clients.py
+++ b/tempest/lib/services/clients.py
@@ -72,15 +72,15 @@
     :raise PluginRegistrationException: if a plugin exposes a service_version
         already defined by Tempest or another plugin.
 
-    Examples:
+    Examples::
 
-        >>> from tempest import config
-        >>> params = {}
-        >>> for service_version in available_modules():
-        >>>     service = service_version.split('.')[0]
-        >>>     params[service] = config.service_client_config(service)
-        >>> service_clients = ServiceClients(creds, identity_uri,
-        >>>                                  client_parameters=params)
+        from tempest import config
+        params = {}
+        for service_version in available_modules():
+            service = service_version.split('.')[0]
+            params[service] = config.service_client_config(service)
+        service_clients = ServiceClients(creds, identity_uri,
+                                         client_parameters=params)
     """
     extra_service_versions = set([])
     _tempest_modules = set(tempest_modules())
@@ -163,17 +163,17 @@
             parameters cannot be deleted.
         :raise ImportError if the specified module_path cannot be imported
 
-        Example:
+        Example::
 
-            >>> # Get credentials and an auth_provider
-            >>> clients = ClientsFactory(
-            >>>     module_path='my_service.my_service_clients',
-            >>>     client_names=['ServiceClient1', 'ServiceClient2'],
-            >>>     auth_provider=auth_provider,
-            >>>     service='my_service',
-            >>>     region='region1')
-            >>> my_api_client = clients.MyApiClient()
-            >>> my_api_client_region2 = clients.MyApiClient(region='region2')
+            # Get credentials and an auth_provider
+            clients = ClientsFactory(
+                module_path='my_service.my_service_clients',
+                client_names=['ServiceClient1', 'ServiceClient2'],
+                auth_provider=auth_provider,
+                service='my_service',
+                region='region1')
+            my_api_client = clients.MyApiClient()
+            my_api_client_region2 = clients.MyApiClient(region='region2')
 
         """
         # Import the module. If it's not importable, the raised exception
@@ -244,19 +244,19 @@
     It hides some of the complexity from the authorization and configuration
     layers.
 
-    Examples:
+    Examples::
 
-        >>> # johndoe is a tempest.lib.auth.Credentials type instance
-        >>> johndoe_clients = clients.ServiceClients(johndoe, identity_uri)
-        >>>
-        >>> # List servers in default region
-        >>> johndoe_servers_client = johndoe_clients.compute.ServersClient()
-        >>> johndoe_servers = johndoe_servers_client.list_servers()
-        >>>
-        >>> # List servers in Region B
-        >>> johndoe_servers_client_B = johndoe_clients.compute.ServersClient(
-        >>>     region='B')
-        >>> johndoe_servers = johndoe_servers_client_B.list_servers()
+        # johndoe is a tempest.lib.auth.Credentials type instance
+        johndoe_clients = clients.ServiceClients(johndoe, identity_uri)
+
+        # List servers in default region
+        johndoe_servers_client = johndoe_clients.compute.ServersClient()
+        johndoe_servers = johndoe_servers_client.list_servers()
+
+        # List servers in Region B
+        johndoe_servers_client_B = johndoe_clients.compute.ServersClient(
+            region='B')
+        johndoe_servers = johndoe_servers_client_B.list_servers()
 
     """
     # NOTE(andreaf) This class does not depend on tempest configuration
@@ -305,14 +305,14 @@
         Registry automatically for all service client (Tempest stable ones
         and plugins).
 
-        Examples:
+        Examples::
 
-            >>> identity_params = config.service_client_config('identity')
-            >>> params = {
-            >>>     'identity': identity_params,
-            >>>     'compute': {'region': 'region2'}}
-            >>> manager = lib_manager.Manager(
-            >>>     my_creds, identity_uri, client_parameters=params)
+            identity_params = config.service_client_config('identity')
+            params = {
+                'identity': identity_params,
+                'compute': {'region': 'region2'}}
+            manager = lib_manager.Manager(
+                my_creds, identity_uri, client_parameters=params)
 
         :param credentials: An instance of `auth.Credentials`
         :param identity_uri: URI of the identity API. This should be a
@@ -328,7 +328,6 @@
             name, as declared in `service_clients.available_modules()` except
             for the version. Values are dictionaries of parameters that are
             going to be passed to all clients in the service client module.
-
         """
         self._registered_services = set([])
         self.credentials = credentials
diff --git a/tempest/lib/services/image/v1/images_client.py b/tempest/lib/services/image/v1/images_client.py
index faafb4a..42f8cf2 100644
--- a/tempest/lib/services/image/v1/images_client.py
+++ b/tempest/lib/services/image/v1/images_client.py
@@ -118,7 +118,7 @@
         if 'changes_since' in kwargs:
             kwargs['changes-since'] = kwargs.pop('changes_since')
 
-        if len(kwargs) > 0:
+        if kwargs:
             url += '?%s' % urllib.urlencode(kwargs)
 
         resp, body = self.get(url)
diff --git a/tempest/test.py b/tempest/test.py
index 8b015cd..10cc1cf 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -126,7 +126,7 @@
         'object': CONF.object_storage_feature_enabled.discoverable_apis,
         'identity': CONF.identity_feature_enabled.api_extensions
     }
-    if len(config_dict[service]) == 0:
+    if not config_dict[service]:
         return False
     if config_dict[service][0] == 'all':
         return True
@@ -147,7 +147,7 @@
     """
 
     filters = CONF.compute_feature_enabled.scheduler_available_filters
-    if len(filters) == 0:
+    if not filters:
         return False
     if 'all' in filters:
         return True
@@ -621,7 +621,7 @@
         """
         if msg is None:
             msg = "sequence or collection is not empty: %s" % items
-        self.assertEqual(0, len(items), msg)
+        self.assertFalse(items, msg)
 
     def assertNotEmpty(self, items, msg=None):
         """Asserts whether a sequence or collection is not empty
@@ -632,4 +632,4 @@
         """
         if msg is None:
             msg = "sequence or collection is empty."
-        self.assertGreater(len(items), 0, msg)
+        self.assertTrue(items, msg)
diff --git a/tempest/test_discover/plugins.py b/tempest/test_discover/plugins.py
index 613ab92..9f75962 100644
--- a/tempest/test_discover/plugins.py
+++ b/tempest/test_discover/plugins.py
@@ -51,36 +51,37 @@
         :param ConfigOpts conf: The conf object that can be used to register
             additional options on.
 
-        Example:
-            >>> # Config options are defined in a config.py module
-            >>> service_option = cfg.BoolOpt(
-            >>>     "my_service",
-            >>>     default=True,
-            >>>     help="Whether or not my service is available")
-            >>>
-            >>> # Note: as long as the group is listed in get_opt_lists,
-            >>> # it will be possible to access its optins in the plugin code
-            >>> # via ("-" in the group name are replaces with "_"):
-            >>> #     CONF.my_service.<option_name>
-            >>> my_service_group = cfg.OptGroup(name="my-service",
-            >>>                                 title="My service options")
-            >>>
-            >>> MyServiceGroup = [<list of options>]
-            >>> # (...) More groups and options...
-            >>>
-            >>> # Plugin is implemented in a plugin.py module
-            >>> from my_plugin import config as my_config
-            >>>
-            >>> def register_opts(self, conf):
-            >>>    conf.register_opt(my_config.service_option,
-            >>>                      group='service_available')
-            >>>    conf.register_group(my_config.my_service_group)
-            >>>    conf.register_opts(my_config.MyService +
-            >>>                       my_config.my_service_group)
-            >>>
-            >>>    conf.register_group(my_config.my_service_feature_group)
-            >>>    conf.register_opts(my_config.MyServiceFeaturesGroup,
-            >>>                       my_config.my_service_feature_group)
+        Example::
+
+            # Config options are defined in a config.py module
+            service_option = cfg.BoolOpt(
+                "my_service",
+                default=True,
+                help="Whether or not my service is available")
+
+            # Note: as long as the group is listed in get_opt_lists,
+            # it will be possible to access its optins in the plugin code
+            # via ("-" in the group name are replaces with "_"):
+            #     CONF.my_service.<option_name>
+            my_service_group = cfg.OptGroup(name="my-service",
+                                            title="My service options")
+
+            MyServiceGroup = [<list of options>]
+            # (...) More groups and options...
+
+            # Plugin is implemented in a plugin.py module
+            from my_plugin import config as my_config
+
+            def register_opts(self, conf):
+                conf.register_opt(my_config.service_option,
+                                  group='service_available')
+                conf.register_group(my_config.my_service_group)
+                conf.register_opts(my_config.MyService +
+                                   my_config.my_service_group)
+
+                conf.register_group(my_config.my_service_feature_group)
+                conf.register_opts(my_config.MyServiceFeaturesGroup,
+                                   my_config.my_service_feature_group)
         """
         return
 
@@ -107,37 +108,41 @@
           of `service_clients.ServiceClients.register_service_client_module`.
         :rtype: list of dictionaries
 
-        Example:
+        Example implementation with one service client::
 
-            >>>  # Example implementation with one service client
-            >>>  myservice_config = config.service_client_config('myservice')
-            >>>  params = {
-            >>>     'name': 'myservice',
-            >>>     'service_version': 'myservice',
-            >>>     'module_path': 'myservice_tempest_tests.services',
-            >>>     'client_names': ['API1Client', 'API2Client'],
-            >>>  }
-            >>>  params.update(myservice_config)
-            >>>  return [params]
+            def get_service_clients(self):
+                # Example implementation with one service client
+                myservice_config = config.service_client_config('myservice')
+                params = {
+                    'name': 'myservice',
+                    'service_version': 'myservice',
+                    'module_path': 'myservice_tempest_tests.services',
+                    'client_names': ['API1Client', 'API2Client'],
+                }
+                params.update(myservice_config)
+                return [params]
 
-            >>>  # Example implementation with two service clients
-            >>>  foo1_config = config.service_client_config('foo')
-            >>>  params_foo1 = {
-            >>>     'name': 'foo_v1',
-            >>>     'service_version': 'foo.v1',
-            >>>     'module_path': 'bar_tempest_tests.services.foo.v1',
-            >>>     'client_names': ['API1Client', 'API2Client'],
-            >>>  }
-            >>>  params_foo1.update(foo_config)
-            >>>  foo2_config = config.service_client_config('foo')
-            >>>  params_foo2 = {
-            >>>     'name': 'foo_v2',
-            >>>     'service_version': 'foo.v2',
-            >>>     'module_path': 'bar_tempest_tests.services.foo.v2',
-            >>>     'client_names': ['API1Client', 'API2Client'],
-            >>>  }
-            >>>  params_foo2.update(foo2_config)
-            >>>  return [params_foo1, params_foo2]
+        Example implementation with two service clients::
+
+            def get_service_clients(self):
+                # Example implementation with two service clients
+                foo1_config = config.service_client_config('foo')
+                params_foo1 = {
+                    'name': 'foo_v1',
+                    'service_version': 'foo.v1',
+                    'module_path': 'bar_tempest_tests.services.foo.v1',
+                    'client_names': ['API1Client', 'API2Client'],
+                }
+                params_foo1.update(foo_config)
+                foo2_config = config.service_client_config('foo')
+                params_foo2 = {
+                    'name': 'foo_v2',
+                    'service_version': 'foo.v2',
+                    'module_path': 'bar_tempest_tests.services.foo.v2',
+                    'client_names': ['API1Client', 'API2Client'],
+                }
+                params_foo2.update(foo2_config)
+                return [params_foo1, params_foo2]
         """
         return []