Modernize python and update pylint (#5096)

Update code to conform to the newer version of pylint available in
ubuntu-22.04, with few exceptions:
    - disabled `import-outside-toplevel` for `main()` in
      `jerry_client.py`
    - disabled `consider-using-with` for the logfile of `TestSuite` in
      `test262-harness.py` as using `with` is not practical in that case

Update test262-harness.py to use argparse instead of the now deprecated
optparse

Rename variables in jerry_client_main.py that redefined python builtins
or shadowed variables from an outer scope

Update python files to use f-stirngs

Add minimum python versions (3.6 and 3.8) to the CI jobs: without it the
default python version did not support the `with` statement for
`subprocess.Popen` used in `build.py` on macos, or in some cases f-stirngs

Remove `from __future__` imports that are no-ops in python 3

Remove shebang from non executable files

Re-enable most pylint checkers, except `missing-docstring`

JerryScript-DCO-1.0-Signed-off-by: Máté Tokodi mate.tokodi@szteszoftver.hu

Author: matetokodi

.github/workflows/gh-actions.yml

@@ -17,7 +17,8 @@ jobs:
           python-version: '3.10'
       - run: sudo apt update
 # TODO: update checkers to current versions available in ubuntu 22.04
-#      - run: sudo apt install doxygen clang-format-10 cppcheck pylint python-serial
+#      - run: sudo apt install doxygen clang-format-10 cppcheck python-serial
+      - run: sudo apt install pylint
       - run: $RUNNER --check-signed-off=gh-actions
         if: ${{ always() }}
 #      - run: $RUNNER --check-doxygen
@@ -28,16 +29,18 @@ jobs:
         if: ${{ always() }}
 #      - run: $RUNNER --check-strings
 #        if: ${{ always() }}
-#      - run: $RUNNER --check-pylint
-#        if: ${{ always() }}
+      - run: $RUNNER --check-pylint
+        if: ${{ always() }}
 #      - run: $RUNNER --check-cppcheck
 #        if: ${{ always() }}
 
   Linux_x86-64_Build_Correctness_Debugger_Tests:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: $RUNNER -q --jerry-tests
       - run: $RUNNER -q --jerry-tests --build-debug
       - run: $RUNNER -q --jerry-debugger
@@ -47,6 +50,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-multilib
       - run: $RUNNER -q --jerry-tests --buildoptions=--compile-flag=-m32,--cpointer-32bit=on
@@ -56,20 +62,29 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: $RUNNER -q --jerry-tests
       - run: $RUNNER -q --unittests
 
   OSX_x86-64_Build_Correctness_Unit_Tests_Debug:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: $RUNNER -q --jerry-tests --build-debug
       - run: $RUNNER -q --unittests --build-debug
 
   Linux_x86-64_Build_Option_Tests:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-multilib
       - run: $RUNNER --buildoption-test
@@ -78,6 +93,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: $RUNNER --test262 update
       - uses: actions/upload-artifact@v2
         if: success() || failure()
@@ -90,6 +108,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: $RUNNER --test262 update --build-debug --test262-test-list=built-ins,annexB,harness,intl402
       - uses: actions/upload-artifact@v2
         if: success() || failure()
@@ -102,6 +123,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: $RUNNER --test262 update --build-debug --test262-test-list=language
       - uses: actions/upload-artifact@v2
         if: success() || failure()
@@ -114,6 +138,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: $RUNNER -q --unittests
       - run: $RUNNER -q --unittests --build-debug
 
@@ -123,6 +150,9 @@ jobs:
       CC: clang
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-multilib
       - run: $RUNNER -q --unittests
@@ -135,6 +165,9 @@ jobs:
       ASAN_OPTIONS: detect_stack_use_after_return=1:check_initialization_order=true:strict_init_order=true
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-multilib
       - run: >-
@@ -148,6 +181,9 @@ jobs:
       ASAN_OPTIONS: detect_stack_use_after_return=1:check_initialization_order=true:strict_init_order=true
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-multilib
       - run: >-
@@ -161,6 +197,9 @@ jobs:
       UBSAN_OPTIONS: print_stacktrace=1
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-multilib
       - run: >-
@@ -179,6 +218,9 @@ jobs:
       TIMEOUT: 300
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-arm-linux-gnueabihf libc6-dev-armhf-cross qemu-user-static
       - run: >-
@@ -192,6 +234,9 @@ jobs:
       TIMEOUT: 300
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-arm-linux-gnueabihf libc6-dev-armhf-cross qemu-user-static
       - run: >-
@@ -205,6 +250,9 @@ jobs:
       TIMEOUT: 300
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-aarch64-linux-gnu libc6-dev-armhf-cross qemu-user-static
       - run: >-
@@ -218,6 +266,9 @@ jobs:
       TIMEOUT: 300
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-aarch64-linux-gnu libc6-dev-armhf-cross qemu-user-static
       - run: >-
@@ -242,9 +293,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
         with:
-          python-version: '3.x'
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gperf dfu-util device-tree-compiler
       - run: make -f ./targets/os/zephyr/Makefile.travis install
@@ -254,6 +305,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '>=3.6'
       - run: sudo apt update
       - run: sudo apt install gcc-arm-none-eabi libnewlib-arm-none-eabi gperf
       - run: make -f ./targets/os/nuttx/Makefile.travis install-noapt
@@ -276,9 +330,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: '>=3.8'
       - run: make -f ./targets/baremetal-sdk/espressif/esp8266-rtos-sdk/Makefile.travis install-noapt
       - run: make -f ./targets/baremetal-sdk/espressif/esp8266-rtos-sdk/Makefile.travis script
 

jerry-debugger/jerry_client.py

@@ -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
@@ -42,7 +41,7 @@ def __init__(self, debugger):
     def precmd(self, line):
         self.stop = False
         if self.debugger.non_interactive:
-            print("%s" % line)
+            print(f"{line}")
         return line
 
     def postcmd(self, stop, line):
@@ -104,14 +103,14 @@ 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
 
                 args -= 1
         except ValueError as val_errno:
-            print("Error: expected a positive integer: %s" % val_errno)
+            print(f"Error: expected a positive integer: {val_errno}")
     do_n = do_next
 
     def do_step(self, _):
@@ -185,10 +184,10 @@ def do_eval_at(self, args):
                 code = args[1]
 
             if index < 0 or index > 65535:
-                raise ValueError("Invalid scope chain index: %d (must be between 0 and 65535)" % index)
+                raise ValueError(f"Invalid scope chain index: {index} (must be between 0 and 65535)")
 
         except ValueError as val_errno:
-            print("Error: %s" % (val_errno))
+            print(f"Error: {val_errno}")
             return
 
         self.debugger.eval_at(code, index)
@@ -259,10 +258,10 @@ def src_check_args(args):
 
         return line_num
     except ValueError as val_errno:
-        print("Error: Non-negative integer number expected: %s" % (val_errno))
+        print(f"Error: Non-negative integer number expected: {val_errno}")
         return -1
 
-# pylint: disable=too-many-branches,too-many-locals,too-many-statements
+# pylint: disable=too-many-branches,too-many-locals,too-many-statements,import-outside-toplevel
 def main():
     args = jerry_client_main.arguments_parse()
 
@@ -325,7 +324,7 @@ 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 +338,7 @@ 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))
+            sys.exit(f"Failed to connect to the JerryScript debugger.\nError: {MSG}")