tests: replace pycodestyle with black

Drop pycodestyle for code style checking in favor of black. Black is
much faster, stable PEP8 compliant code style checker offering also
automatic formatting. It aims to be very stable and produce smallest
diffs. It's used by many small and big projects.

Running checkstyle with black takes a few seconds with a terse output.
Thus, test-checkstyle-diff is no longer necessary.

Expand scope of checkstyle to all python files in the repo, replacing
test-checkstyle with checkstyle-python.

Also, fixstyle-python is now available for automatic style formatting.

Note: python virtualenv has been consolidated in test/Makefile,
test/requirements*.txt which will eventually be moved to a central
location.  This is required to simply the automated generation of
docker executor images in the CI.

Type: improvement
Change-Id: I022a326603485f58585e879ac0f697fceefbc9c8
Signed-off-by: Klement Sekera <klement.sekera@gmail.com>
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>

1 files changed, 131 insertions, 156 deletions

diff --git a/test/test_lb.py b/test/test_lb.py
index fafb87b62d9..dca9ea3f7ef 100644
--- a/test/test_lb.py
+++ b/test/test_lb.py
@@ -32,7 +32,7 @@ from vpp_ip import INVALID_INDEX
 
 
 class TestLB(VppTestCase):
-    """ Load Balancer Test Case """
+    """Load Balancer Test Case"""
 
     @classmethod
     def setUpClass(cls):
@@ -53,18 +53,23 @@ class TestLB(VppTestCase):
                 i.resolve_arp()
                 i.resolve_ndp()
 
-            dst4 = VppIpRoute(cls, "10.0.0.0", 24,
-                              [VppRoutePath(cls.pg1.remote_ip4,
-                                            INVALID_INDEX)],
-                              register=False)
+            dst4 = VppIpRoute(
+                cls,
+                "10.0.0.0",
+                24,
+                [VppRoutePath(cls.pg1.remote_ip4, INVALID_INDEX)],
+                register=False,
+            )
             dst4.add_vpp_config()
-            dst6 = VppIpRoute(cls, "2002::", 16,
-                              [VppRoutePath(cls.pg1.remote_ip6,
-                                            INVALID_INDEX)],
-                              register=False)
+            dst6 = VppIpRoute(
+                cls,
+                "2002::",
+                16,
+                [VppRoutePath(cls.pg1.remote_ip6, INVALID_INDEX)],
+                register=False,
+            )
             dst6.add_vpp_config()
-            cls.vapi.lb_conf(ip4_src_address="39.40.41.42",
-                             ip6_src_address="2004::1")
+            cls.vapi.lb_conf(ip4_src_address="39.40.41.42", ip6_src_address="2004::1")
         except Exception:
             super(TestLB, cls).tearDownClass()
             raise
@@ -80,13 +85,15 @@ class TestLB(VppTestCase):
         self.logger.info(self.vapi.cli("show lb vip verbose"))
 
     def getIPv4Flow(self, id):
-        return (IP(dst="90.0.%u.%u" % (id / 255, id % 255),
-                   src="40.0.%u.%u" % (id / 255, id % 255)) /
-                UDP(sport=10000 + id, dport=20000))
+        return IP(
+            dst="90.0.%u.%u" % (id / 255, id % 255),
+            src="40.0.%u.%u" % (id / 255, id % 255),
+        ) / UDP(sport=10000 + id, dport=20000)
 
     def getIPv6Flow(self, id):
-        return (IPv6(dst="2001::%u" % (id), src="fd00:f00d:ffff::%u" % (id)) /
-                UDP(sport=10000 + id, dport=20000))
+        return IPv6(dst="2001::%u" % (id), src="fd00:f00d:ffff::%u" % (id)) / UDP(
+            sport=10000 + id, dport=20000
+        )
 
     def generatePackets(self, src_if, isv4):
         self.reset_packet_infos()
@@ -95,9 +102,9 @@ class TestLB(VppTestCase):
             info = self.create_packet_info(src_if, self.pg1)
             payload = self.info_to_payload(info)
             ip = self.getIPv4Flow(pktid) if isv4 else self.getIPv6Flow(pktid)
-            packet = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                      ip /
-                      Raw(payload))
+            packet = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac) / ip / Raw(payload)
+            )
             self.extend_packet(packet, 128)
             info.data = packet.copy()
             pkts.append(packet)
@@ -112,8 +119,9 @@ class TestLB(VppTestCase):
         payload_info = self.payload_to_info(inner[Raw])
         self.info = self.packet_infos[payload_info.index]
         self.assertEqual(payload_info.src, self.pg0.sw_if_index)
-        self.assertEqual(scapy.compat.raw(inner),
-                         scapy.compat.raw(self.info.data[IPver]))
+        self.assertEqual(
+            scapy.compat.raw(inner), scapy.compat.raw(self.info.data[IPver])
+        )
 
     def checkCapture(self, encap, isv4):
         self.pg0.assert_nothing_captured()
@@ -125,7 +133,7 @@ class TestLB(VppTestCase):
             try:
                 asid = 0
                 gre = None
-                if (encap == 'gre4'):
+                if encap == "gre4":
                     ip = p[IP]
                     asid = int(ip.dst.split(".")[3])
                     self.assertEqual(ip.version, 4)
@@ -136,7 +144,7 @@ class TestLB(VppTestCase):
                     self.assertEqual(len(ip.options), 0)
                     gre = p[GRE]
                     self.checkInner(gre, isv4)
-                elif (encap == 'gre6'):
+                elif encap == "gre6":
                     ip = p[IPv6]
                     asid = ip.dst.split(":")
                     asid = asid[len(asid) - 1]
@@ -147,26 +155,26 @@ class TestLB(VppTestCase):
                     self.assertEqual(ip.src, "2004::1")
                     self.assertEqual(
                         socket.inet_pton(socket.AF_INET6, ip.dst),
-                        socket.inet_pton(socket.AF_INET6, "2002::%u" % asid)
+                        socket.inet_pton(socket.AF_INET6, "2002::%u" % asid),
                     )
                     self.assertEqual(ip.nh, 47)
                     # self.assertEqual(len(ip.options), 0)
                     gre = GRE(scapy.compat.raw(p[IPv6].payload))
                     self.checkInner(gre, isv4)
-                elif (encap == 'l3dsr'):
+                elif encap == "l3dsr":
                     ip = p[IP]
                     asid = int(ip.dst.split(".")[3])
                     self.assertEqual(ip.version, 4)
                     self.assertEqual(ip.flags, 0)
                     self.assertEqual(ip.dst, "10.0.0.%u" % asid)
-                    self.assertEqual(ip.tos, 0x1c)
+                    self.assertEqual(ip.tos, 0x1C)
                     self.assertEqual(len(ip.options), 0)
                     self.assert_ip_checksum_valid(p)
                     if ip.proto == IP_PROTOS.tcp:
                         self.assert_tcp_checksum_valid(p)
                     elif ip.proto == IP_PROTOS.udp:
                         self.assert_udp_checksum_valid(p)
-                elif (encap == 'nat4'):
+                elif encap == "nat4":
                     ip = p[IP]
                     asid = int(ip.dst.split(".")[3])
                     self.assertEqual(ip.version, 4)
@@ -176,7 +184,7 @@ class TestLB(VppTestCase):
                     self.assertEqual(len(ip.options), 0)
                     udp = p[UDP]
                     self.assertEqual(udp.dport, 3307)
-                elif (encap == 'nat6'):
+                elif encap == "nat6":
                     ip = p[IPv6]
                     asid = ip.dst.split(":")
                     asid = asid[len(asid) - 1]
@@ -186,7 +194,7 @@ class TestLB(VppTestCase):
                     self.assertEqual(ip.fl, 0)
                     self.assertEqual(
                         socket.inet_pton(socket.AF_INET6, ip.dst),
-                        socket.inet_pton(socket.AF_INET6, "2002::%u" % asid)
+                        socket.inet_pton(socket.AF_INET6, "2002::%u" % asid),
                     )
                     self.assertEqual(ip.nh, 17)
                     self.assertGreaterEqual(ip.hlim, 63)
@@ -202,301 +210,268 @@ class TestLB(VppTestCase):
         for asid in self.ass:
             if load[asid] < int(len(self.packets) / (len(self.ass) * 2)):
                 self.logger.error(
-                    "ASS is not balanced: load[%d] = %d" % (asid, load[asid]))
+                    "ASS is not balanced: load[%d] = %d" % (asid, load[asid])
+                )
                 raise Exception("Load Balancer algorithm is biased")
 
     def test_lb_ip4_gre4(self):
-        """ Load Balancer IP4 GRE4 on vip case """
+        """Load Balancer IP4 GRE4 on vip case"""
         try:
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 encap gre4")
+            self.vapi.cli("lb vip 90.0.0.0/8 encap gre4")
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 90.0.0.0/8 10.0.0.%u"
-                    % (asid))
+                self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u" % (asid))
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
-            self.checkCapture(encap='gre4', isv4=True)
+            self.checkCapture(encap="gre4", isv4=True)
 
         finally:
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 90.0.0.0/8 10.0.0.%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 encap gre4 del")
+                self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u del" % (asid))
+            self.vapi.cli("lb vip 90.0.0.0/8 encap gre4 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip6_gre4(self):
-        """ Load Balancer IP6 GRE4 on vip case """
+        """Load Balancer IP6 GRE4 on vip case"""
 
         try:
-            self.vapi.cli(
-                "lb vip 2001::/16 encap gre4")
+            self.vapi.cli("lb vip 2001::/16 encap gre4")
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 2001::/16 10.0.0.%u"
-                    % (asid))
+                self.vapi.cli("lb as 2001::/16 10.0.0.%u" % (asid))
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
 
-            self.checkCapture(encap='gre4', isv4=False)
+            self.checkCapture(encap="gre4", isv4=False)
         finally:
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 2001::/16 10.0.0.%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 2001::/16 encap gre4 del")
+                self.vapi.cli("lb as 2001::/16 10.0.0.%u del" % (asid))
+            self.vapi.cli("lb vip 2001::/16 encap gre4 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip4_gre6(self):
-        """ Load Balancer IP4 GRE6 on vip case """
+        """Load Balancer IP4 GRE6 on vip case"""
         try:
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 encap gre6")
+            self.vapi.cli("lb vip 90.0.0.0/8 encap gre6")
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 90.0.0.0/8 2002::%u"
-                    % (asid))
+                self.vapi.cli("lb as 90.0.0.0/8 2002::%u" % (asid))
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
 
-            self.checkCapture(encap='gre6', isv4=True)
+            self.checkCapture(encap="gre6", isv4=True)
         finally:
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 90.0.0.0/8 2002::%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 encap gre6 del")
+                self.vapi.cli("lb as 90.0.0.0/8 2002::%u del" % (asid))
+            self.vapi.cli("lb vip 90.0.0.0/8 encap gre6 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip6_gre6(self):
-        """ Load Balancer IP6 GRE6 on vip case """
+        """Load Balancer IP6 GRE6 on vip case"""
         try:
-            self.vapi.cli(
-                "lb vip 2001::/16 encap gre6")
+            self.vapi.cli("lb vip 2001::/16 encap gre6")
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 2001::/16 2002::%u"
-                    % (asid))
+                self.vapi.cli("lb as 2001::/16 2002::%u" % (asid))
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
 
-            self.checkCapture(encap='gre6', isv4=False)
+            self.checkCapture(encap="gre6", isv4=False)
         finally:
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 2001::/16 2002::%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 2001::/16 encap gre6 del")
+                self.vapi.cli("lb as 2001::/16 2002::%u del" % (asid))
+            self.vapi.cli("lb vip 2001::/16 encap gre6 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip4_gre4_port(self):
-        """ Load Balancer IP4 GRE4 on per-port-vip case """
+        """Load Balancer IP4 GRE4 on per-port-vip case"""
         try:
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 protocol udp port 20000 encap gre4")
+            self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre4")
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u"
-                    % (asid))
+                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u" % (asid)
+                )
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
-            self.checkCapture(encap='gre4', isv4=True)
+            self.checkCapture(encap="gre4", isv4=True)
 
         finally:
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 protocol udp port 20000 encap gre4 del")
+                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del" % (asid)
+                )
+            self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre4 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip6_gre4_port(self):
-        """ Load Balancer IP6 GRE4 on per-port-vip case """
+        """Load Balancer IP6 GRE4 on per-port-vip case"""
 
         try:
-            self.vapi.cli(
-                "lb vip 2001::/16 protocol udp port 20000 encap gre4")
+            self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre4")
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 2001::/16 protocol udp port 20000 10.0.0.%u"
-                    % (asid))
+                    "lb as 2001::/16 protocol udp port 20000 10.0.0.%u" % (asid)
+                )
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
 
-            self.checkCapture(encap='gre4', isv4=False)
+            self.checkCapture(encap="gre4", isv4=False)
         finally:
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 2001::/16 protocol udp port 20000 10.0.0.%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 2001::/16 protocol udp port 20000 encap gre4 del")
+                    "lb as 2001::/16 protocol udp port 20000 10.0.0.%u del" % (asid)
+                )
+            self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre4 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip4_gre6_port(self):
-        """ Load Balancer IP4 GRE6 on per-port-vip case """
+        """Load Balancer IP4 GRE6 on per-port-vip case"""
         try:
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 protocol udp port 20000 encap gre6")
+            self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre6")
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 2002::%u"
-                    % (asid))
+                    "lb as 90.0.0.0/8 protocol udp port 20000 2002::%u" % (asid)
+                )
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
 
-            self.checkCapture(encap='gre6', isv4=True)
+            self.checkCapture(encap="gre6", isv4=True)
         finally:
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 2002::%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 protocol udp port 20000 encap gre6 del")
+                    "lb as 90.0.0.0/8 protocol udp port 20000 2002::%u del" % (asid)
+                )
+            self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre6 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip6_gre6_port(self):
-        """ Load Balancer IP6 GRE6 on per-port-vip case """
+        """Load Balancer IP6 GRE6 on per-port-vip case"""
         try:
-            self.vapi.cli(
-                "lb vip 2001::/16 protocol udp port 20000 encap gre6")
+            self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre6")
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 2001::/16 protocol udp port 20000 2002::%u"
-                    % (asid))
+                    "lb as 2001::/16 protocol udp port 20000 2002::%u" % (asid)
+                )
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
 
-            self.checkCapture(encap='gre6', isv4=False)
+            self.checkCapture(encap="gre6", isv4=False)
         finally:
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 2001::/16 protocol udp port 20000 2002::%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 2001::/16 protocol udp port 20000 encap gre6 del")
+                    "lb as 2001::/16 protocol udp port 20000 2002::%u del" % (asid)
+                )
+            self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre6 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip4_l3dsr(self):
-        """ Load Balancer IP4 L3DSR on vip case """
+        """Load Balancer IP4 L3DSR on vip case"""
         try:
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 encap l3dsr dscp 7")
+            self.vapi.cli("lb vip 90.0.0.0/8 encap l3dsr dscp 7")
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 90.0.0.0/8 10.0.0.%u"
-                    % (asid))
+                self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u" % (asid))
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
-            self.checkCapture(encap='l3dsr', isv4=True)
+            self.checkCapture(encap="l3dsr", isv4=True)
 
         finally:
             for asid in self.ass:
-                self.vapi.cli(
-                    "lb as 90.0.0.0/8 10.0.0.%u del"
-                    % (asid))
-            self.vapi.cli(
-                "lb vip 90.0.0.0/8 encap l3dsr"
-                " dscp 7 del")
+                self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u del" % (asid))
+            self.vapi.cli("lb vip 90.0.0.0/8 encap l3dsr dscp 7 del")
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip4_l3dsr_port(self):
-        """ Load Balancer IP4 L3DSR on per-port-vip case """
+        """Load Balancer IP4 L3DSR on per-port-vip case"""
         try:
             self.vapi.cli(
-                "lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr dscp 7")
+                "lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr dscp 7"
+            )
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u"
-                    % (asid))
+                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u" % (asid)
+                )
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
-            self.checkCapture(encap='l3dsr', isv4=True)
+            self.checkCapture(encap="l3dsr", isv4=True)
 
         finally:
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del"
-                    % (asid))
+                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del" % (asid)
+                )
             self.vapi.cli(
-                "lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr"
-                " dscp 7 del")
+                "lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr dscp 7 del"
+            )
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip4_nat4_port(self):
-        """ Load Balancer IP4 NAT4 on per-port-vip case """
+        """Load Balancer IP4 NAT4 on per-port-vip case"""
         try:
             self.vapi.cli(
                 "lb vip 90.0.0.0/8 protocol udp port 20000 encap nat4"
-                " type clusterip target_port 3307")
+                " type clusterip target_port 3307"
+            )
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u"
-                    % (asid))
+                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u" % (asid)
+                )
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
-            self.checkCapture(encap='nat4', isv4=True)
+            self.checkCapture(encap="nat4", isv4=True)
 
         finally:
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del"
-                    % (asid))
+                    "lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del" % (asid)
+                )
             self.vapi.cli(
                 "lb vip 90.0.0.0/8 protocol udp port 20000 encap nat4"
-                " type clusterip target_port 3307 del")
+                " type clusterip target_port 3307 del"
+            )
             self.vapi.cli("test lb flowtable flush")
 
     def test_lb_ip6_nat6_port(self):
-        """ Load Balancer IP6 NAT6 on per-port-vip case """
+        """Load Balancer IP6 NAT6 on per-port-vip case"""
         try:
             self.vapi.cli(
                 "lb vip 2001::/16 protocol udp port 20000 encap nat6"
-                " type clusterip target_port 3307")
+                " type clusterip target_port 3307"
+            )
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 2001::/16 protocol udp port 20000 2002::%u"
-                    % (asid))
+                    "lb as 2001::/16 protocol udp port 20000 2002::%u" % (asid)
+                )
 
             self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
-            self.checkCapture(encap='nat6', isv4=False)
+            self.checkCapture(encap="nat6", isv4=False)
 
         finally:
             for asid in self.ass:
                 self.vapi.cli(
-                    "lb as 2001::/16 protocol udp port 20000 2002::%u del"
-                    % (asid))
+                    "lb as 2001::/16 protocol udp port 20000 2002::%u del" % (asid)
+                )
             self.vapi.cli(
                 "lb vip 2001::/16 protocol udp port 20000 encap nat6"
-                " type clusterip target_port 3307 del")
+                " type clusterip target_port 3307 del"
+            )
             self.vapi.cli("test lb flowtable flush")