pylint fix: Use 'with' on file handle

vppcfg/vpp/dumper.py

@@ -41,18 +41,14 @@ class Dumper(VPPApi):
 
     def write(self, outfile):
         """Emit the configuration to either stdout (outfile=='-') or a filename"""
+        config = self.cache_to_config()
         if outfile and outfile == "-":
             file = sys.stdout
             outfile = "(stdout)"
-        else:
-            file = open(outfile, "w", encoding="utf-8")
-
-        config = self.cache_to_config()
-
             print(yaml.dump(config), file=file)
-
-        if file is not sys.stdout:
-            file.close()
+        else:
+            with open(outfile, "w", encoding="utf-8") as file:
+                print(yaml.dump(config), file=file)
         self.logger.info(f"Wrote YAML config to {outfile}")
 
     def cache_to_config(self):

vppcfg/vpp/reconciler.py

@@ -1530,11 +1530,11 @@ class Reconciler:
         if outfile and outfile == "-":
             file = sys.stdout
             outfile = "(stdout)"
-        else:
-            file = open(outfile, "w", encoding="utf-8")
             if len(output) > 0:
                 print("\n".join(output), file=file)
-        if file is not sys.stdout:
-            file.close()
+        else:
+            with open(outfile, "w", encoding="utf-8") as file:
+                if len(output) > 0:
+                    print("\n".join(output), file=file)
 
         self.logger.info(f"Wrote {len(output)} lines to {outfile}")