Fix nasa#46 Recommended lgtm python issues

Problems shown in this issue were fixed in nasa#72 as part of
updates/refactoring. Other lgtm issues addressed here.
Problems in auto-generated .py files not addressed.
Auto-generated .py files renamed with Ui_ prefix.
The lgtm.yml file must be updated to exclude these
See nasa/cFS#92

GroundSystem.py

@@ -105,7 +105,6 @@ def startCmdSystem():
     def startFDLSystem(self):
         selectedSpacecraft = self.getSelectedSpacecraftName()
         if selectedSpacecraft == 'All':
-            subscription = ''
             self.DisplayErrorMessage(
                 'Cannot open FDL manager.\nNo spacecraft selected.')
         else:

Subsystems/cmdGui/CHeaderParser.py

@@ -103,13 +103,11 @@ def getFileList(filename='CHeaderParser-hdr-paths.txt'):
                 l = l.strip()
                 if l and not l.startswith("#"):
                     paths.append(l)
-            print(f"Using header files found in {filename}")
-            # Send paths back to caller function
-            return paths
+        print(f"Using header files found in {filename}")
+        # Send paths back to caller function
+        return paths
     except IOError:
         print("Couldn't find default file. Check command line arguments.")
-    except:
-        print("Unexpected error:", sys.exc_info()[0])
 
     print("No header files found. Please make sure to provide the\n"
           "default file for loading headers (CHeaderParser-hdr-paths.txt)")
@@ -449,7 +447,7 @@ def getFileList(filename='CHeaderParser-hdr-paths.txt'):
                                 input((f"Please enter the defined value for "
                                        f"{array_name_size[1]} (0 - 128): ")))
                         except ValueError:
-                            pass
+                            pass     # Ignore non-integer and try again
 
                     # Add string length argument to parameter list
                     stringLens.append(array_size)

Subsystems/cmdGui/CommandSystem.py

@@ -28,7 +28,7 @@
 
 from PyQt5.QtWidgets import QApplication, QDialog
 
-from CommandSystemDialog import Ui_CommandSystemDialog
+from Ui_CommandSystemDialog import Ui_CommandSystemDialog
 
 ROOTDIR = Path(sys.argv[0]).resolve().parent
 
@@ -161,7 +161,7 @@ def ProcessQuickButton(self, idx):
     #
     # Mark the remaining values as invalid
     #
-    for j in range(i, 22):
+    for _ in range(i, 22):
         cmdPageAppid.append(0)
         cmdPageIsValid.append(False)
 
@@ -204,7 +204,7 @@ def ProcessQuickButton(self, idx):
                 quickIdx = subsys.index(cmdPageDesc[k])
                 quickButton.setText(quickCmd[quickIdx])
             except ValueError:
-                pass
+                pass    # Ignore quick button
             quickIndices.append(quickIdx)
         else:
             subsysBrowser.setText("(unused)")

Subsystems/cmdGui/Parameter.py

@@ -28,7 +28,7 @@
 from PyQt5.QtWidgets import QApplication, QDialog
 
 from HTMLDocsParser import HTMLDocsParser
-from ParameterDialog import Ui_Dialog
+from Ui_ParameterDialog import Ui_Dialog
 
 ROOTDIR = Path(sys.argv[0]).resolve().parent
 
@@ -82,7 +82,7 @@ def ProcessSendButton(self):
     #
     subsysTitle, cmdDesc, pageEndian, pageAddress, cmdCode, params = (
         '' for _ in range(6))
-    idx, pagePktId, pagePort = (0 for _ in range(3))
+    pagePktId, pagePort = 0, 0
     param_file = 'struct_c_f_e___e_s___start_app_cmd__t.html'
 
     #
@@ -99,7 +99,7 @@ def ProcessSendButton(self):
         elif opt in ("-d", "--descrip"):
             cmdDesc = arg  # command name, eg No-Op
         elif opt in ("-i", "--idx"):
-            idx = int(arg)  # comand index in command definition file
+            _ = int(arg)  # comand index in command definition file
         elif opt in ("-h", "--host"):
             pageAddress = arg  # send to address
         elif opt in ("-p", "--port"):
@@ -141,7 +141,7 @@ def ProcessSendButton(self):
             paramName.setText(paramNames[i])
             descrip.setText(paramDesc[i])
         except IndexError:
-            pass
+            pass  # Ignore nonexistent array items
 
     #
     # Displays the dialog

Subsystems/cmdGui/UdpCommands.py

@@ -41,7 +41,7 @@
 
 from PyQt5.QtWidgets import QApplication, QDialog
 
-from GenericCommandDialog import Ui_GenericCommandDialog
+from Ui_GenericCommandDialog import Ui_GenericCommandDialog
 
 ROOTDIR = Path(sys.argv[0]).resolve().parent
 

Subsystems/tlmGUI/EventMessage.py

@@ -69,7 +69,7 @@
 from PyQt5.QtCore import QThread, pyqtSignal
 from PyQt5.QtWidgets import QApplication, QDialog
 
-from EventMessageDialog import Ui_EventMessageDialog
+from Ui_EventMessageDialog import Ui_EventMessageDialog
 
 ROOTDIR = Path(sys.argv[0]).resolve().parent
 
@@ -168,9 +168,7 @@ def usage():
     # Set defaults for the arguments
     #
     pageTitle = "Event Messages"
-    udpPort = 10000
     appId = 999
-    tlmDefFile = "not-needed.txt"
     endian = "L"
     subscription = ""
 
@@ -190,11 +188,11 @@ def usage():
             usage()
             sys.exit()
         if opt in ("-p", "--port"):
-            udpPort = arg
+            _ = arg
         elif opt in ("-t", "--title"):
             pageTitle = arg
         elif opt in ("-f", "--file"):
-            tlmDefFile = arg
+            _ = arg
         elif opt in ("-a", "--appid"):
             appId = arg
         elif opt in ("-e", "--endian"):
@@ -207,8 +205,6 @@ def usage():
 
     print('Event Messages Page started. Subscribed to', subscription)
 
-    py_endian = '<' if endian == 'L' else '>'
-
     #
     # Init the QT application and the Event Message class
     #

Subsystems/tlmGUI/GenericTelemetry.py

@@ -30,7 +30,7 @@
 from PyQt5.QtCore import QThread, pyqtSignal
 from PyQt5.QtWidgets import QApplication, QDialog
 
-from GenericTelemetryDialog import Ui_GenericTelemetryDialog
+from Ui_GenericTelemetryDialog import Ui_GenericTelemetryDialog
 
 ROOTDIR = Path(sys.argv[0]).resolve().parent
 
@@ -124,7 +124,7 @@ def __init__(self, subscr):
     def run(self):
         while self.runs:
             # Read envelope with address
-            address, datagram = self.subscriber.recv_multipart()
+            _, datagram = self.subscriber.recv_multipart()
             # Send signal with received packet to front-end/GUI
             self.gtSignalTlmDatagram.emit(datagram)
 
@@ -147,7 +147,7 @@ def usage():
     # Set defaults for the arguments
     #
     pageTitle = "Telemetry Page"
-    udpPort = 10000
+    # udpPort = 10000
     appId = 999
     tlmDefFile = f"{ROOTDIR}/telemetry_def.txt"
     endian = "L"
@@ -169,7 +169,7 @@ def usage():
             usage()
             sys.exit()
         elif opt in ("-p", "--port"):
-            udpPort = arg
+            _ = arg
         elif opt in ("-t", "--title"):
             pageTitle = arg
         elif opt in ("-f", "--file"):
@@ -225,7 +225,7 @@ def usage():
     #
     # Mark the remaining values as invalid
     #
-    for j in range(i, 40):
+    for _ in range(i, 40):
         tlmItemIsValid.append(False)
 
     #

Subsystems/tlmGUI/TelemetrySystem.py

@@ -31,7 +31,7 @@
 from PyQt5.QtCore import QThread, pyqtSignal
 from PyQt5.QtWidgets import QApplication, QDialog
 
-from TelemetrySystemDialog import Ui_TelemetrySystemDialog
+from Ui_TelemetrySystemDialog import Ui_TelemetrySystemDialog
 
 ROOTDIR = Path(sys.argv[0]).resolve().parent
 
@@ -219,7 +219,7 @@ def run(self):
     #
     # Mark the remaining values ad invalid
     #
-    for j in range(i, 21):
+    for _ in range(i, 21):
         tlmPageAppid.append(0)
         tlmPageIsValid.append(False)
 

TlmMQRecv.py

@@ -36,9 +36,12 @@ def main():
     subscriber.setsockopt(zmq.SUBSCRIBE, b"GroundSystem")
 
     while True:
-        # Read envelope with address
-        address, contents = subscriber.recv_multipart()
-        print(f"[{address}] {contents}")
+        try:
+            # Read envelope with address
+            address, contents = subscriber.recv_multipart()
+            print(f"[{address}] {contents}")
+        except KeyboardInterrupt:
+            break
 
     # We never get here but clean up anyhow
     subscriber.close()