Upgrade jerry-debugger client to use python3

Also upgrade pylint to use python3.

JerryScript-DCO-1.0-Signed-off-by: Csaba Repasi repasics@inf.u-szeged.hu

Author: repasics

.github/workflows/gh-actions.yml

@@ -16,7 +16,7 @@ jobs:
         with:
           python-version: '3.8'
       - run: sudo apt update
-      - run: sudo apt install doxygen clang-format-10 cppcheck pylint python-serial
+      - run: sudo apt install doxygen clang-format-10 cppcheck pylint3 python3-serial
       - run: $RUNNER --check-signed-off=gh-actions
         if: ${{ always() }}
       - run: $RUNNER --check-doxygen
@@ -36,9 +36,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
-        with:
-          python-version: '2.7' # needed by jerry-debugger
       - run: $RUNNER -q --jerry-tests
       - run: $RUNNER -q --jerry-tests --build-debug
       - run: $RUNNER -q --jerry-debugger

jerry-debugger/jerry_client.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright JS Foundation and other contributors, http://js.foundation
 #
@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import print_function
 from cmd import Cmd
 from pprint import pprint
 import math
@@ -104,7 +103,7 @@ def do_next(self, args):
                     if res_type == result.END:
                         self.quit = True
                         return
-                    elif res_type == result.TEXT:
+                    if res_type == result.TEXT:
                         write(result.get_text())
                     elif res_type == result.PROMPT:
                         break
@@ -279,6 +278,7 @@ def main():
 
         protocol = Socket(address)
     elif args.protocol == "serial":
+        # pylint: disable=import-outside-toplevel
         from jerry_client_serial import Serial
         protocol = Serial(args.serial_config)
     else:
@@ -325,7 +325,7 @@ def main():
 
         if res_type == result.END:
             break
-        elif res_type == result.PROMPT:
+        if res_type == result.PROMPT:
             prompt.cmdloop()
         elif res_type == result.TEXT:
             write(result.get_text())
@@ -339,7 +339,7 @@ def main():
         MSG = str(error_msg)
         if ERRNO == 111:
             sys.exit("Failed to connect to the JerryScript debugger.")
-        elif ERRNO == 32 or ERRNO == 104:
+        elif ERRNO in (32, 104):
             sys.exit("Connection closed.")
         else:
             sys.exit("Failed to connect to the JerryScript debugger.\nError: %s" % (MSG))