diff --git a/tests/lwip/tests/01-run.py b/tests/lwip/tests/01-run.py
index 788748c27565..c95e573e28ce 100755
--- a/tests/lwip/tests/01-run.py
+++ b/tests/lwip/tests/01-run.py
@@ -20,7 +20,7 @@
 
 class Strategy(object):
     def __init__(self, func=None):
-        if func != None:
+        if func is not None:
             if sys.version_info < (3,):
                 self.__class__.execute = types.MethodType(func, self, self.__class__)
             else:
@@ -43,7 +43,7 @@ def __init__(self, board, func=None):
 
     def __run_make(self, application, make_targets, env=None):
         env = os.environ.copy()
-        if env != None:
+        if env is not None:
             env.update(env)
         env.update(self.board.to_env())
         cmd = ("make", "-C", application) + make_targets
@@ -81,7 +81,7 @@ def __init__(self, name, port=None, serial=None, clean=None,
         def _reset_native_execute(obj, application, env=None, *args, **kwargs):
             pass
 
-        if (name == "native") and (reset == None):
+        if (name == "native") and (reset is None):
                 reset = _reset_native_execute
 
         self.name = name
@@ -161,7 +161,7 @@ def reset(self, application=os.getcwd(), env=None):
 def default_test_case(board_group, application, env=None):
     for board in board_group:
         env = os.environ.copy()
-        if env != None:
+        if env is not None:
             env.update(env)
         env.update(board.to_env())
         with pexpect.spawnu("make", ["-C", application, "term"], env=env,
@@ -191,11 +191,11 @@ def get_ipv6_address(spawn):
 
 def test_ipv6_send(board_group, application, env=None):
     env_sender = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_sender.update(env)
     env_sender.update(board_group.boards[0].to_env())
     env_receiver = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_receiver.update(env)
     env_receiver.update(board_group.boards[1].to_env())
     with pexpect.spawnu("make", ["-C", application, "term"], env=env_sender,
@@ -215,11 +215,11 @@ def test_ipv6_send(board_group, application, env=None):
 
 def test_udpv6_send(board_group, application, env=None):
     env_sender = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_sender.update(env)
     env_sender.update(board_group.boards[0].to_env())
     env_receiver = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_receiver.update(env)
     env_receiver.update(board_group.boards[1].to_env())
     with pexpect.spawnu("make", ["-C", application, "term"], env=env_sender,
@@ -240,11 +240,11 @@ def test_udpv6_send(board_group, application, env=None):
 
 def test_tcpv6_send(board_group, application, env=None):
     env_client = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_client.update(env)
     env_client.update(board_group.boards[0].to_env())
     env_server = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_server.update(env)
     env_server.update(board_group.boards[1].to_env())
     with pexpect.spawnu("make", ["-C", application, "term"], env=env_client,
@@ -270,11 +270,11 @@ def test_tcpv6_send(board_group, application, env=None):
 
 def test_triple_send(board_group, application, env=None):
     env_sender = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_sender.update(env)
     env_sender.update(board_group.boards[0].to_env())
     env_receiver = os.environ.copy()
-    if env != None:
+    if env is not None:
         env_receiver.update(env)
     env_receiver.update(board_group.boards[1].to_env())
     with pexpect.spawnu("make", ["-C", application, "term"], env=env_sender,