Updates to `/tools` for Python 3 compatibility

tools/export/exporters.py

@@ -28,6 +28,7 @@ import copy
 from tools.targets import TARGET_MAP
 from tools.utils import mkdir
 from tools.resources import FileType, FileRef
+from future.utils import with_metaclass
 
 """Just a template for subclassing"""
 
@@ -57,14 +58,13 @@ def deprecated_exporter(CLS):
     CLS.NAME = "%s (DEPRECATED)" % old_name
     return CLS
 
-class Exporter(object):
+class Exporter(with_metaclass(ABCMeta, object)):
     """Exporter base class
 
     This class is meant to be extended by individual exporters, and provides a
     few helper methods for implementing an exporter with either jinja2 or
     progen.
     """
-    __metaclass__ = ABCMeta
     TEMPLATE_DIR = dirname(__file__)
     DOT_IN_RELATIVE_PATH = False
     NAME = None

tools/flash_algo/__init__.py

@@ -134,7 +134,7 @@ class PackFlashAlgo(object):
             blob = self.algo_data[:]
             pad_size = 0 if len(blob) % 4 == 0 else 4 - len(blob) % 4
             blob = blob + "\x00" * pad_size
-            integer_list = struct.unpack("<" + "L" * (len(blob) / 4), blob)
+            integer_list = struct.unpack("<" + "L" * (len(blob) // 4), blob)
             line_list = []
             for pos in range(0, len(integer_list), group_size):
                 group = ["0x%08x" % value for value in

tools/host_tests/echo_flow_control.py

@@ -14,7 +14,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
-from host_test import Test
+from .host_test import Test
 
 
 class EchoTest(Test):

tools/host_tests/hello_auto.py

@@ -16,6 +16,7 @@ limitations under the License.
 """
 
 class HelloTest():
+class HelloTest(object):
     HELLO_WORLD = "Hello World"
 
     def test(self, selftest):

tools/host_tests/host_registry.py

@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-class HostRegistry:
+class HostRegistry(object):
     """ Class stores registry with host tests and objects representing them
     """ 
     HOST_TESTS = {} # host_test_name -> host_test_ojbect

tools/host_tests/host_test.py

@@ -18,8 +18,8 @@ limitations under the License.
 # Check if 'serial' module is installed
 try:
     from serial import Serial
-except ImportError, e:
+except ImportError as e:
-    print "Error: Can't import 'serial' module: %s"% e
+    print("Error: Can't import 'serial' module: %s"% e)
     exit(-1)
 
 import os
@@ -29,7 +29,7 @@ from sys import stdout
 from time import sleep, time
 from optparse import OptionParser
 
-import host_tests_plugins
+from . import host_tests_plugins
 
 # This is a little tricky. We need to add upper directory to path so
 # we can find packages we want from the same level as other files do
@@ -39,7 +39,7 @@ from tools.test_api import get_autodetected_MUTS_list
 from tools.test_api import get_module_avail
 
 
-class Mbed:
+class Mbed(object):
     """ Base class for a host driven test
     """
     def __init__(self):
@@ -117,7 +117,7 @@ class Mbed:
         self.serial_timeout = 1
 
         self.timeout = self.DEFAULT_TOUT if self.options.timeout is None else self.options.timeout
-        print 'MBED: Instrumentation: "%s" and disk: "%s"' % (self.port, self.disk)
+        print('MBED: Instrumentation: "%s" and disk: "%s"' % (self.port, self.disk))
 
     def init_serial_params(self, serial_baud=9600, serial_timeout=1):
         """ Initialize port parameters.
@@ -183,11 +183,11 @@ class Mbed:
                 stdout.write('.')
                 stdout.flush()
             else:
-                print "...port ready!"
+                print("...port ready!")
                 result = True
                 break
         if not result and last_error:
-            print last_error
+            print(last_error)
         return result
 
     def set_serial_timeout(self, timeout):
@@ -221,7 +221,7 @@ class Mbed:
                     c = self.serial.read(1)
                     result += c
                 except Exception as e:
-                    print "MBED: %s"% str(e)
+                    print("MBED: %s"% str(e))
                     result = None
                     break
                 if c == '\n':
@@ -298,7 +298,7 @@ class Mbed:
         return result
 
 
-class HostTestResults:
+class HostTestResults(object):
     """ Test results set by host tests
     """
     def __init__(self):
@@ -389,8 +389,8 @@ class Test(HostTestResults):
                 self.print_result(result)
             else:
                 self.notify("HOST: Passive mode...")
-        except Exception, e:
+        except Exception as e:
-            print str(e)
+            print(str(e))
             self.print_result(self.RESULT_ERROR)
 
     def setup(self):
@@ -406,7 +406,7 @@ class Test(HostTestResults):
     def notify(self, message):
         """ On screen notification function
         """
-        print message
+        print(message)
         stdout.flush()
 
     def print_result(self, result):

tools/host_tests/mbedrpc.py

@@ -27,10 +27,12 @@
 # >myled.write(1)
 # >
 
-import serial, urllib2, time
+from future import standard_library
+standard_library.install_aliases()
+import serial, urllib.request, urllib.error, urllib.parse, time
 
 # mbed super class
-class mbed:
+class mbed(object):
     def __init__(self):
         print("This will work as a demo but no transport mechanism has been selected")
 
@@ -48,7 +50,7 @@ class SerialRPC(mbed):
         # creates the command to be sent serially - /name/method arg1 arg2 arg3 ... argN
         str = "/" + name + "/" + method + " " + " ".join(args) + "\n"
         # prints the command being executed
-        print str
+        print(str)
         # writes the command to serial
         self.ser.write(str)
         # strips trailing characters from the line just written
@@ -61,12 +63,12 @@ class HTTPRPC(mbed):
         self.host = "http://" + ip
 
     def rpc(self, name, method, args):
-        response = urllib2.urlopen(self.host + "/rpc/" + name + "/" + method + "%20" + "%20".join(args))
+        response = urllib.request.urlopen(self.host + "/rpc/" + name + "/" + method + "%20" + "%20".join(args))
         return response.read().strip()
 
 
 # generic mbed interface super class
-class mbed_interface():
+class mbed_interface(object):
     # initialize an mbed interface with a transport mechanism and pin name
     def __init__(self, this_mbed, mpin):
         self.mbed = this_mbed
@@ -198,7 +200,7 @@ class Timer(mbed_interface):
         return float(re.search('\d+\.*\d*', r).group(0))
 
 # Serial
-class Serial():
+class Serial(object):
     def __init__(self, this_mbed, tx, rx=""):
         self.mbed = this_mbed
         if isinstance(tx, str):

tools/host_tests/net_test.py

@@ -14,7 +14,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
-from host_test import Test, Simple
+from .host_test import Test, Simple
 from sys import stdout
 
 class NETTest(Simple):

tools/host_tests/rpc.py

@@ -14,8 +14,8 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
-from host_test import Test
+from .host_test import Test
-from mbedrpc import SerialRPC, DigitalOut, DigitalIn, pin
+from .mbedrpc import SerialRPC, DigitalOut, DigitalIn, pin
 
 
 class RpcTest(Test):
@@ -30,7 +30,7 @@ class RpcTest(Test):
 
         if hasattr(self.mbed.options, 'micro'):
             if self.mbed.options.micro == 'M0+':
-                print "Freedom Board: PTA12 <-> PTC4"
+                print("Freedom Board: PTA12 <-> PTC4")
                 p_out = pin("PTA12")
                 p_in  = pin("PTC4")
 

tools/host_tests/serial_complete_auto.py

@@ -21,7 +21,7 @@ import time
 import string
 from sys import stdout
 
-class SerialCompleteTest():
+class SerialCompleteTest(object):
 
     def test(self, selftest):
         strip_chars = string.whitespace + "\0"

tools/host_tests/serial_nc_rx_auto.py

@@ -21,7 +21,7 @@ import time
 import string
 from sys import stdout
 
-class SerialNCRXTest():
+class SerialNCRXTest(object):
 
     def test(self, selftest):
         selftest.mbed.flush();

tools/host_tests/serial_nc_tx_auto.py

@@ -21,7 +21,7 @@ import time
 import string
 from sys import stdout
 
-class SerialNCTXTest():
+class SerialNCTXTest(object):
 
     def test(self, selftest):
         selftest.mbed.flush();

tools/host_tests/stdio_auto.py

@@ -19,7 +19,7 @@ import re
 import random
 from time import time
 
-class StdioTest():
+class StdioTest(object):
     PATTERN_INT_VALUE = "Your value was: (-?\d+)"
     re_detect_int_value = re.compile(PATTERN_INT_VALUE)
 

tools/host_tests/tcpecho_client.py

@@ -26,9 +26,9 @@ LEN_PACKET = 127
 N_PACKETS = 5000
 TOT_BITS = float(LEN_PACKET * N_PACKETS * 8) * 2
 MEGA = float(1024 * 1024)
-UPDATE_STEP = (N_PACKETS/10)
+UPDATE_STEP = N_PACKETS // 10
 
-class TCP_EchoClient:
+class TCP_EchoClient(object):
     def __init__(self, host):
         self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         self.s.connect((host, ECHO_PORT))
@@ -44,10 +44,10 @@ class TCP_EchoClient:
     def test(self):
         start = time()
         for i in range(N_PACKETS):
-            if (i % UPDATE_STEP) == 0: print '%.2f%%' % ((float(i)/float(N_PACKETS)) * 100.)
+            if (i % UPDATE_STEP) == 0: print('%.2f%%' % ((float(i)/float(N_PACKETS)) * 100.))
             self.__packet()
         t = time() - start
-        print 'Throughput: (%.2f)Mbits/s' % ((TOT_BITS / t)/MEGA)
+        print('Throughput: (%.2f)Mbits/s' % ((TOT_BITS / t)/MEGA))
 
     def __del__(self):
         self.s.close()

tools/host_tests/tcpecho_client_auto.py

@@ -35,7 +35,7 @@ class TCPEchoClient_Handler(BaseRequestHandler):
             if not data: break
             self.request.sendall(data)
             if '{{end}}' in str(data):
-                print
+                print()
                 print(str(data))
             else:
                 if not count % 10:
@@ -43,7 +43,7 @@ class TCPEchoClient_Handler(BaseRequestHandler):
                 count += 1
             stdout.flush()
 
-class TCPEchoClientTest():
+class TCPEchoClientTest(object):
     def send_server_ip_port(self, selftest, ip_address, port_no):
         """ Set up network host. Reset target and and send server IP via serial to Mbed
         """

tools/host_tests/tcpecho_server.py

@@ -14,7 +14,10 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
+try:
     from SocketServer import BaseRequestHandler, TCPServer
+except ImportError:
+    from socketserver import BaseRequestHandler, TCPServer
 from time import time
 
 from mbed_settings import LOCALHOST
@@ -24,7 +27,7 @@ MEGA = float(1024 * 1024)
 
 class TCP_EchoHandler(BaseRequestHandler):
     def handle(self):
-        print "\nconnection received"
+        print("\nconnection received")
         start = time()
         bytes = 0
         index = 0
@@ -35,7 +38,7 @@ class TCP_EchoHandler(BaseRequestHandler):
             bytes += len(data)
             for n in map(ord, data):
                 if n != index:
-                    print "data error %d != %d" % (n , index)
+                    print("data error %d != %d" % (n , index))
                 index += 1
                 if index > MAX_INDEX:
                     index = 0
@@ -43,8 +46,8 @@ class TCP_EchoHandler(BaseRequestHandler):
             self.request.sendall(data)
         t = time() - start
         b = float(bytes * 8) * 2
-        print "Throughput: (%.2f)Mbits/s" % ((b/t)/MEGA)
+        print("Throughput: (%.2f)Mbits/s" % ((b/t)/MEGA))
 
 server = TCPServer((LOCALHOST, 7), TCP_EchoHandler)
-print "listening for connections"
+print("listening for connections")
 server.serve_forever()

tools/host_tests/tcpecho_server_auto.py

@@ -22,7 +22,7 @@ import uuid
 import socket
 from sys import stdout
 
-class TCPEchoServerTest():
+class TCPEchoServerTest(object):
     ECHO_SERVER_ADDRESS = ""
     ECHO_PORT = 0
     ECHO_LOOPs = 100

tools/host_tests/tcpecho_server_loop.py

@@ -21,20 +21,23 @@ ROOT = abspath(join(dirname(__file__), "..", ".."))
 sys.path.insert(0, ROOT)
 
 from mbed_settings import LOCALHOST
+try:
     from SocketServer import BaseRequestHandler, TCPServer
+except ImportError:
+    from socketserver import BaseRequestHandler, TCPServer
 
 
 class TCP_EchoHandler(BaseRequestHandler):
     def handle(self):
-        print "\nHandle connection from:", self.client_address
+        print("\nHandle connection from:", self.client_address)
         while True:
             data = self.request.recv(1024)
             if not data: break
             self.request.sendall(data)
         self.request.close()
-        print "socket closed"
+        print("socket closed")
 
 if __name__ == '__main__':
     server = TCPServer((LOCALHOST, 7), TCP_EchoHandler)
-    print "listening for connections on:", (LOCALHOST, 7)
+    print("listening for connections on:", (LOCALHOST, 7))
     server.serve_forever()

tools/host_tests/udp_link_layer_auto.py

@@ -24,11 +24,20 @@ udp_link_layer_auto.py -p COM20 -d E:\ -t 10
 import re
 import uuid
 import socket
+try:
+    # Python 3
+    import _thread as thread
+except ImportError:
+    # Python 2
     import thread
 from sys import stdout
 from time import time, sleep
-from host_test import DefaultTest
+from .host_test import DefaultTest
+
+try:
     from SocketServer import BaseRequestHandler, UDPServer
+except ImportError:
+    from socketserver import BaseRequestHandler, UDPServer
 
 
 # Received datagrams (with time)
@@ -52,7 +61,7 @@ def udp_packet_recv(threadName, server_ip, server_port):
     """ This function will receive packet stream from mbed device
     """
     server = UDPServer((server_ip, server_port), UDPEchoClient_Handler)
-    print "[UDP_COUNTER] Listening for connections... %s:%d"% (server_ip, server_port)
+    print("[UDP_COUNTER] Listening for connections... %s:%d"% (server_ip, server_port))
     server.serve_forever()
 
 
@@ -74,7 +83,7 @@ class UDPEchoServerTest(DefaultTest):
         try:
             s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
             s.connect((self.ECHO_SERVER_ADDRESS, self.CONTROL_PORT))
-        except Exception, e:
+        except Exception as e:
             data = None
         s.send(command)
         data = s.recv(BUFFER_SIZE)
@@ -97,7 +106,7 @@ class UDPEchoServerTest(DefaultTest):
         # Open client socket to burst datagrams to UDP server in mbed
         try:
             self.s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        except Exception, e:
+        except Exception as e:
             self.s = None
             self.notify("HOST: Error: %s"% e)
             return self.RESULT_ERROR

tools/host_tests/udpecho_client.py

@@ -26,9 +26,9 @@ LEN_PACKET = 127
 N_PACKETS = 5000
 TOT_BITS = float(LEN_PACKET * N_PACKETS * 8) * 2
 MEGA = float(1024 * 1024)
-UPDATE_STEP = (N_PACKETS/10)
+UPDATE_STEP = N_PACKETS // 10
 
-class UDP_EchoClient:
+class UDP_EchoClient(object):
     s = socket(AF_INET, SOCK_DGRAM)
 
     def __init__(self, host):
@@ -45,10 +45,10 @@ class UDP_EchoClient:
     def test(self):
         start = time()
         for i in range(N_PACKETS):
-            if (i % UPDATE_STEP) == 0: print '%.2f%%' % ((float(i)/float(N_PACKETS)) * 100.)
+            if (i % UPDATE_STEP) == 0: print('%.2f%%' % ((float(i)/float(N_PACKETS)) * 100.))
             self.__packet()
         t = time() - start
-        print 'Throughput: (%.2f)Mbits/s' % ((TOT_BITS / t)/MEGA)
+        print('Throughput: (%.2f)Mbits/s' % ((TOT_BITS / t)/MEGA))
 
 while True:
     e = UDP_EchoClient(CLIENT_ADDRESS)

tools/host_tests/udpecho_client_auto.py

@@ -36,7 +36,7 @@ class UDPEchoClient_Handler(BaseRequestHandler):
             sys.stdout.write('.')
         stdout.flush()
 
-class UDPEchoClientTest():
+class UDPEchoClientTest(object):
 
     def send_server_ip_port(self, selftest, ip_address, port_no):
         c = selftest.mbed.serial_readline() # 'UDPCllient waiting for server IP and port...'

tools/host_tests/udpecho_server.py

@@ -14,16 +14,19 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
+try:
     from SocketServer import BaseRequestHandler, UDPServer
+except ImportError:
+    from socketserver import BaseRequestHandler, UDPServer
 from mbed_settings import SERVER_ADDRESS
 
 class UDP_EchoHandler(BaseRequestHandler):
     def handle(self):
         data, socket = self.request
-        print "client:", self.client_address
+        print("client:", self.client_address)
-        print "data:", data
+        print("data:", data)
         socket.sendto(data, self.client_address)
 
 server = UDPServer((SERVER_ADDRESS, 7195), UDP_EchoHandler)
-print "listening for connections"
+print("listening for connections")
 server.serve_forever()

tools/host_tests/udpecho_server_auto.py

@@ -22,7 +22,7 @@ import uuid
 from sys import stdout
 from socket import socket, AF_INET, SOCK_DGRAM
 
-class UDPEchoServerTest():
+class UDPEchoServerTest(object):
     ECHO_SERVER_ADDRESS = ""
     ECHO_PORT = 0
     s = None # Socket

tools/host_tests/wait_us_auto.py

@@ -17,7 +17,7 @@ limitations under the License.
 
 from time import time
 
-class WaitusTest():
+class WaitusTest(object):
     """ This test is reading single characters from stdio
         and measures time between their occurrences.
     """

tools/host_tests/wfi_auto.py

@@ -20,7 +20,7 @@ import uuid
 import time
 from sys import stdout
 
-class WFITest():
+class WFITest(object):
 
     def test(self, selftest):
         c = selftest.mbed.serial_readline()

tools/notifier/__init__.py

@@ -16,9 +16,10 @@
 from __future__ import print_function, division, absolute_import
 
 from abc import ABCMeta, abstractmethod
+from future.utils import with_metaclass
 
 
-class Notifier(object):
+class Notifier(with_metaclass(ABCMeta, object)):
     """
     Notifiers send build system events to a front end or may implement a front
     end themselves, displaying warnings and errors for a user.
@@ -48,8 +49,6 @@ class Notifier(object):
                  | communicate the binary location to the online IDE.
     """
 
-    __metaclass__ = ABCMeta
-
     @abstractmethod
     def notify(self, event):
         """

tools/targets/REALTEK_RTL8195AM.py

@@ -33,7 +33,7 @@ def format_number(number, width):
     # convert to string
     line = format(number, '0%dx' % (width))
     if len(line) > width:
-        print "[ERROR] 0x%s cannot fit in width %d" % (line, width)
+        print("[ERROR] 0x%s cannot fit in width %d" % (line, width))
         sys.exit(-1)
     # cut string to list & reverse
     line = [line[i:i+2] for i in range(0, len(line), 2)]
@@ -58,7 +58,7 @@ def write_padding_bytes(output_name, size):
     current_size = os.stat(output_name).st_size
     padcount = size - current_size
     if padcount < 0:
-        print "[ERROR] image is larger than expected size"
+        print("[ERROR] image is larger than expected size")
         sys.exit(-1)
     output = open(output_name, "ab")
     output.write('\377' * padcount)
@@ -96,7 +96,7 @@ def find_symbol(toolchain, mapfile, symbol):
                 ret = match.group("addr")
 
     if not ret:
-        print "[ERROR] cannot find the address of symbol " + symbol
+        print("[ERROR] cannot find the address of symbol " + symbol)
         return 0
 
     return int(ret,16) | 1

tools/targets/STM32_gen_PeripheralPins.py

@@ -1274,7 +1274,7 @@ if args.list:
     for f in fnmatch.filter(os.listdir(cubemxdirMCU), "STM32*.xml"):
         print(f)
         FileCount += 1
-    print
+    print()
     print("%i available xml files description" % FileCount)
     quit()
 
@@ -1287,7 +1287,7 @@ if args.boards:
             NucleoFileCount += 1
         elif "Discovery" in f:
             DiscoFileCount += 1
-    print
+    print()
     print("%2i available Nucleo files description" % NucleoFileCount)
     print("%2i available Disco  files description" % DiscoFileCount)
     quit()

tools/targets/__init__.py

@@ -646,7 +646,7 @@ class MCU_NRF51Code(object):
             binh.write_hex_file(fileout, write_start_addr=False)
 
 
-class NCS36510TargetCode:
+class NCS36510TargetCode(object):
     @staticmethod
     def ncs36510_addfib(t_self, resources, elf, binf):
         from tools.targets.NCS import add_fib_at_start
@@ -654,7 +654,7 @@ class NCS36510TargetCode:
         add_fib_at_start(binf[:-4])
 
 
-class RTL8195ACode:
+class RTL8195ACode(object):
     """RTL8195A Hooks"""
     @staticmethod
     def binary_hook(t_self, resources, elf, binf):
@@ -662,7 +662,7 @@ class RTL8195ACode:
         rtl8195a_elf2bin(t_self, elf, binf)
 
 
-class PSOC6Code:
+class PSOC6Code(object):
     @staticmethod
     def complete(t_self, resources, elf, binf):
         from tools.targets.PSOC6 import complete as psoc6_complete
@@ -694,7 +694,7 @@ class PSOC6Code:
             from tools.targets.PSOC6 import sign_image as psoc6_sign_image
             psoc6_sign_image(t_self, binf)
 
-class ArmMuscaA1Code:
+class ArmMuscaA1Code(object):
     """Musca-A1 Hooks"""
     @staticmethod
     def binary_hook(t_self, resources, elf, binf):
@@ -710,7 +710,7 @@ class ArmMuscaA1Code:
         musca_tfm_bin(t_self, binf, secure_bin)
 
 
-class LPC55S69Code:
+class LPC55S69Code(object):
     """LPC55S69 Hooks"""
     @staticmethod
     def binary_hook(t_self, resources, elf, binf):
@@ -725,7 +725,7 @@ class LPC55S69Code:
         )
         lpc55s69_complete(t_self, binf, secure_bin)
 
-class M2351Code:
+class M2351Code(object):
     """M2351 Hooks"""
     @staticmethod
     def merge_secure(t_self, resources, ns_elf, ns_hex):

tools/targets/lint.py

@@ -247,14 +247,14 @@ def subcommand(name, *args, **kwargs):
                  choices=TARGET_MAP.keys(), type=str.upper))
 def targets_cmd(mcus=[]):
     """Find and print errors about specific targets"""
-    print dump_all([check_hierarchy(TARGET_MAP[m]) for m in mcus],
+    print(dump_all([check_hierarchy(TARGET_MAP[m]) for m in mcus],
-                   default_flow_style=False)
+                   default_flow_style=False))
 
 @subcommand("all-targets")
 def all_targets_cmd():
     """Print all errors about all parts"""
-    print dump_all([check_hierarchy(m) for m in TARGET_MAP.values()],
+    print(dump_all([check_hierarchy(m) for m in list(TARGET_MAP.values())],
-                   default_flow_style=False)
+                   default_flow_style=False))
 
 @subcommand("orphans")
 def orphans_cmd():
@@ -265,7 +265,7 @@ def orphans_cmd():
             if name in orphans:
                 orphans.remove(name)
     if orphans:
-        print dump_all([orphans], default_flow_style=False)
+        print(dump_all([orphans], default_flow_style=False))
     return len(orphans)
 
 def main():

tools/test/detect_targets_test.py

@@ -20,7 +20,7 @@ from mock import patch
 from tools.detect_targets import get_interface_version
 
 
-class MbedLsToolsMock():
+class MbedLsToolsMock(object):
     """
     Mock of mbedls tools
     """

tools/toolchains/mbed_toolchain.py

@@ -49,6 +49,7 @@ from ..config import (ConfigException, RAM_ALL_MEMORIES, ROM_ALL_MEMORIES)
 from ..regions import (UPDATE_WHITELIST, merge_region_list)
 from ..settings import COMPARE_FIXED
 from ..settings import ARM_PATH, ARMC6_PATH, GCC_ARM_PATH, IAR_PATH
+from future.utils import with_metaclass
 
 
 TOOLCHAIN_PATHS = {
@@ -109,7 +110,7 @@ CORTEX_SYMBOLS = {
 }
 
 
-class mbedToolchain:
+class mbedToolchain(with_metaclass(ABCMeta, object)):
     OFFICIALLY_SUPPORTED = False
 
     # Verbose logging
@@ -127,8 +128,6 @@ class mbedToolchain:
 
     PROFILE_FILE_NAME = ".profile"
 
-    __metaclass__ = ABCMeta
-
     profile_template = {'common': [], 'c': [], 'cxx': [], 'asm': [], 'ld': []}
 
     def __init__(self, target, notify=None, macros=None, build_profile=None,