diff --git a/bin/wsdump.py b/bin/wsdump.py
index c2fb49f..ea6bbb2 100755
--- a/bin/wsdump.py
+++ b/bin/wsdump.py
@@ -28,7 +28,7 @@ ENCODING = get_encoding()
 
 class VAction(argparse.Action):
     def __call__(self, parser, args, values, option_string=None):
-        if values==None:
+        if values is None:
             values = "1"
         try:
             values = int(values)
diff --git a/websocket/_abnf.py b/websocket/_abnf.py
index 2c7c4ab..912672a 100644
--- a/websocket/_abnf.py
+++ b/websocket/_abnf.py
@@ -116,7 +116,7 @@ class ABNF(object):
         self.rsv3 = rsv3
         self.opcode = opcode
         self.mask = mask
-        if data == None:
+        if data is None:
             data = ""
         self.data = data
         self.get_mask_key = os.urandom
@@ -224,7 +224,7 @@ class ABNF(object):
 
         data: data to mask/unmask.
         """
-        if data == None:
+        if data is None:
             data = ""
 
         if isinstance(mask_key, six.text_type):
diff --git a/websocket/_http.py b/websocket/_http.py
index 63f3f83..8fae73f 100644
--- a/websocket/_http.py
+++ b/websocket/_http.py
@@ -161,7 +161,7 @@ def _ssl_socket(sock, user_sslopt, hostname):
     
     certPath = os.path.join(
         os.path.dirname(__file__), "cacert.pem")
-    if os.path.isfile(certPath) and user_sslopt.get('ca_certs', None) == None:
+    if os.path.isfile(certPath) and user_sslopt.get('ca_certs', None) is None:
         sslopt['ca_certs'] = certPath
     check_hostname = sslopt["cert_reqs"] != ssl.CERT_NONE and sslopt.pop('check_hostname', True)