diff --git a/examples/protocols/mqtt/ssl_ds/configure_ds.py b/examples/protocols/mqtt/ssl_ds/configure_ds.py
index 374309a365..b718052301 100644
--- a/examples/protocols/mqtt/ssl_ds/configure_ds.py
+++ b/examples/protocols/mqtt/ssl_ds/configure_ds.py
@@ -29,14 +29,14 @@ from cryptography.utils import int_to_bytes
 try:
     import nvs_partition_gen as nvs_gen
 except ImportError:
-    idf_path = os.getenv("IDF_PATH")
+    idf_path = os.getenv('IDF_PATH')
     if not idf_path or not os.path.exists(idf_path):
-        raise Exception("IDF_PATH not found")
-    sys.path.insert(0, os.path.join(idf_path, "components", "nvs_flash", "nvs_partition_generator"))
+        raise Exception('IDF_PATH not found')
+    sys.path.insert(0, os.path.join(idf_path, 'components', 'nvs_flash', 'nvs_partition_generator'))
     import nvs_partition_gen as nvs_gen
 
 # Check python version is proper or not to avoid script failure
-assert sys.version_info >= (3, 6, 0), "Python version too low."
+assert sys.version_info >= (3, 6, 0), 'Python version too low.'
 
 esp_ds_data_dir = 'esp_ds_data'
 # hmac_key_file is generated when HMAC_KEY is calculated, it is used when burning HMAC_KEY to efuse
@@ -59,7 +59,7 @@ def get_idf_target():
         idf_target_read = sdkconfig['IDF_TARGET']
         return idf_target_read
     else:
-        print("ERROR: IDF_TARGET has not been set for the supported targets,"
+        print('ERROR: IDF_TARGET has not been set for the supported targets,'
               "\nplase execute command \"idf.py set-target {TARGET}\" in the example directory")
         return None
 
@@ -96,10 +96,10 @@ def number_as_bytes(number, pad_bits=None):
 def calculate_ds_parameters(privkey, priv_key_pass, hmac_key, idf_target):
     private_key = load_privatekey(privkey, priv_key_pass)
     if not isinstance(private_key, rsa.RSAPrivateKey):
-        print("ERROR: Only RSA private keys are supported")
+        print('ERROR: Only RSA private keys are supported')
         sys.exit(-1)
     if hmac_key is None:
-        print("ERROR: hmac_key cannot be None")
+        print('ERROR: hmac_key cannot be None')
         sys.exit(-2)
 
     priv_numbers = private_key.private_numbers()
@@ -108,7 +108,7 @@ def calculate_ds_parameters(privkey, priv_key_pass, hmac_key, idf_target):
     M = pub_numbers.n
     key_size = private_key.key_size
     if key_size not in supported_key_size[idf_target]:
-        print("ERROR: Private key size {0} not supported for the target {1},\nthe supported key sizes are {2}"
+        print('ERROR: Private key size {0} not supported for the target {1},\nthe supported key sizes are {2}'
               .format(key_size, idf_target, str(supported_key_size[idf_target])))
         sys.exit(-1)
 
@@ -122,12 +122,12 @@ def calculate_ds_parameters(privkey, priv_key_pass, hmac_key, idf_target):
 
     # get max supported key size for the respective target
     max_len = max(supported_key_size[idf_target])
-    aes_key = hmac.HMAC(hmac_key, b"\xFF" * 32, hashlib.sha256).digest()
+    aes_key = hmac.HMAC(hmac_key, b'\xFF' * 32, hashlib.sha256).digest()
 
     md_in = number_as_bytes(Y, max_len) + \
         number_as_bytes(M, max_len) + \
         number_as_bytes(rinv, max_len) + \
-        struct.pack("<II", mprime, length) + \
+        struct.pack('<II', mprime, length) + \
         iv
 
     # expected_len = max_len_Y + max_len_M + max_len_rinv + (mprime + length packed (8 bytes))+ iv (16 bytes)
@@ -142,7 +142,7 @@ def calculate_ds_parameters(privkey, priv_key_pass, hmac_key, idf_target):
         number_as_bytes(M, max_len) + \
         number_as_bytes(rinv, max_len) + \
         md + \
-        struct.pack("<II", mprime, length) + \
+        struct.pack('<II', mprime, length) + \
         b'\x08' * 8
 
     # expected_len = max_len_Y + max_len_M + max_len_rinv + md (32 bytes) + (mprime + length packed (8bytes)) + padding (8 bytes)
@@ -158,7 +158,7 @@ def calculate_ds_parameters(privkey, priv_key_pass, hmac_key, idf_target):
 # @info
 #       The function makes use of the "espefuse.py" script to read the efuse summary
 def efuse_summary(args, idf_target):
-    os.system("python $IDF_PATH/components/esptool_py/esptool/espefuse.py --chip {0} -p {1} summary".format(idf_target, (args.port)))
+    os.system('python $IDF_PATH/components/esptool_py/esptool/espefuse.py --chip {0} -p {1} summary'.format(idf_target, (args.port)))
 
 
 # @info
@@ -172,9 +172,9 @@ def efuse_burn_key(args, idf_target):
         # read protection will be enabled as the default behaviour of the command
         key_block_status = ' '
 
-    os.system("python $IDF_PATH/components/esptool_py/esptool/espefuse.py --chip {0} -p {1} burn_key "
-              "{2} {3} HMAC_DOWN_DIGITAL_SIGNATURE {4}"
-              .format((idf_target), (args.port), ("BLOCK_KEY" + str(args.efuse_key_id)), (hmac_key_file), (key_block_status)))
+    os.system('python $IDF_PATH/components/esptool_py/esptool/espefuse.py --chip {0} -p {1} burn_key '
+              '{2} {3} HMAC_DOWN_DIGITAL_SIGNATURE {4}'
+              .format((idf_target), (args.port), ('BLOCK_KEY' + str(args.efuse_key_id)), (hmac_key_file), (key_block_status)))
 
 
 # @info
@@ -183,12 +183,12 @@ def efuse_burn_key(args, idf_target):
 def generate_csv_file(c, iv, hmac_key_id, key_size, csv_file):
 
     with open(csv_file, 'wt', encoding='utf8') as f:
-        f.write("# This is a generated csv file containing required parameters for the Digital Signature operation\n")
-        f.write("key,type,encoding,value\nesp_ds_ns,namespace,,\n")
-        f.write("esp_ds_c,data,hex2bin,%s\n" % (c.hex()))
-        f.write("esp_ds_iv,data,hex2bin,%s\n" % (iv.hex()))
-        f.write("esp_ds_key_id,data,u8,%d\n" % (hmac_key_id))
-        f.write("esp_ds_rsa_len,data,u16,%d\n" % (key_size))
+        f.write('# This is a generated csv file containing required parameters for the Digital Signature operation\n')
+        f.write('key,type,encoding,value\nesp_ds_ns,namespace,,\n')
+        f.write('esp_ds_c,data,hex2bin,%s\n' % (c.hex()))
+        f.write('esp_ds_iv,data,hex2bin,%s\n' % (iv.hex()))
+        f.write('esp_ds_key_id,data,u8,%d\n' % (hmac_key_id))
+        f.write('esp_ds_rsa_len,data,u16,%d\n' % (key_size))
 
 
 class DefineArgs(object):
@@ -219,8 +219,8 @@ def generate_nvs_partition(input_filename, output_filename):
 def get_efuse_summary_json(args, idf_target):
     _efuse_summary = None
     try:
-        _efuse_summary = subprocess.check_output(("python $IDF_PATH/components/esptool_py/esptool/espefuse.py "
-                                                  "--chip {0} -p {1} summary --format json".format(idf_target, (args.port))), shell=True)
+        _efuse_summary = subprocess.check_output(('python $IDF_PATH/components/esptool_py/esptool/espefuse.py '
+                                                  '--chip {0} -p {1} summary --format json'.format(idf_target, (args.port))), shell=True)
     except subprocess.CalledProcessError as e:
         print((e.output).decode('UTF-8'))
         sys.exit(-1)
@@ -272,8 +272,8 @@ def configure_efuse_key_block(args, idf_target):
         if new_hmac_key == hmac_key_read:
             print('Key was successfully written to the efuse (KEY BLOCK %1d)' % (args.efuse_key_id))
         else:
-            print("ERROR: Failed to burn the hmac key to efuse (KEY BLOCK %1d),"
-                  "\nPlease execute the script again using a different key id" % (args.efuse_key_id))
+            print('ERROR: Failed to burn the hmac key to efuse (KEY BLOCK %1d),'
+                  '\nPlease execute the script again using a different key id' % (args.efuse_key_id))
             return None
     else:
         # If the efuse key block is redable, then read the key from efuse block and use it for encrypting the RSA private key parameters.
@@ -281,20 +281,20 @@ def configure_efuse_key_block(args, idf_target):
         # value than "HMAC_DOWN_DIGITAL_SIGNATURE" then we cannot use it for DS operation
         if kb_readable is True:
             if efuse_summary_json[key_purpose]['value'] == 'HMAC_DOWN_DIGITAL_SIGNATURE':
-                print("Provided efuse key block (KEY BLOCK %1d) already contains a key with key_purpose=HMAC_DOWN_DIGITAL_SIGNATURE,"
-                      "\nusing the same key for encrypting the private key data...\n" % (args.efuse_key_id))
+                print('Provided efuse key block (KEY BLOCK %1d) already contains a key with key_purpose=HMAC_DOWN_DIGITAL_SIGNATURE,'
+                      '\nusing the same key for encrypting the private key data...\n' % (args.efuse_key_id))
                 hmac_key_read = efuse_summary_json[key_blk]['value']
                 hmac_key_read = bytes.fromhex(hmac_key_read)
                 if args.keep_ds_data is True:
                     with open(hmac_key_file, 'wb') as key_file:
                         key_file.write(hmac_key_read)
             else:
-                print("ERROR: Provided efuse key block ((KEY BLOCK %1d)) contains a key with key purpose different"
-                      "than HMAC_DOWN_DIGITAL_SIGNATURE,\nplease execute the script again with a different value of the efuse key id." % (args.efuse_key_id))
+                print('ERROR: Provided efuse key block ((KEY BLOCK %1d)) contains a key with key purpose different'
+                      'than HMAC_DOWN_DIGITAL_SIGNATURE,\nplease execute the script again with a different value of the efuse key id.' % (args.efuse_key_id))
                 return None
         else:
-            print("ERROR: Provided efuse key block (KEY BLOCK %1d) is not readable and writeable,"
-                  "\nplease execute the script again with a different value of the efuse key id." % (args.efuse_key_id))
+            print('ERROR: Provided efuse key block (KEY BLOCK %1d) is not readable and writeable,'
+                  '\nplease execute the script again with a different value of the efuse key id.' % (args.efuse_key_id))
             return None
 
     # Return the hmac key read from the efuse
@@ -322,7 +322,7 @@ def main():
         help='relative path to client private key')
 
     parser.add_argument(
-        "--pwd", '--password',
+        '--pwd', '--password',
         dest='priv_key_pass',
         metavar='[password]',
         help='the password associated with the private key')
@@ -340,7 +340,7 @@ def main():
         help='Provide the efuse key_id which contains/will contain HMAC_KEY, default is 1')
 
     parser.add_argument(
-        "--port", '-p',
+        '--port', '-p',
         dest='port',
         metavar='[port]',
         required=True,
@@ -391,5 +391,5 @@ def main():
     cleanup(args)
 
 
-if __name__ == "__main__":
+if __name__ == '__main__':
     main()