[processing] Use with ... when opening files

(partially cherry-picked from 6a99017)

python/plugins/processing/algs/otb/OTBAlgorithm.py

@@ -127,8 +127,8 @@ def get_list_from_node(self, myet):
         return all_params
 
     def defineCharacteristicsFromFile(self):
-        content = open(self.descriptionFile).read()
-        dom_model = ET.fromstring(content)
+        with open(self.descriptionFile) as content:
+            dom_model = ET.fromstring(content.read())
 
         self.appkey = dom_model.find('key').text
         self.cliName = dom_model.find('exec').text

python/plugins/processing/algs/otb/OTBUtils.py

@@ -274,10 +274,9 @@ def remove_parameter_by_criteria(doc, criteria):
 
 
 def defaultWrite(available_app, original_dom_document):
-    fh = open("description/%s.xml" % available_app, "w")
-    the_root = original_dom_document
-    ET.ElementTree(the_root).write(fh)
-    fh.close()
+    with open("description/%s.xml" % available_app, "w") as fh:
+        the_root = original_dom_document
+        ET.ElementTree(the_root).write(fh)
 
 
 def defaultSplit(available_app, original_dom_document, parameter):

python/plugins/processing/algs/otb/maintenance/OTBHelper.py

@@ -656,16 +656,15 @@ def create_xml_descriptors():
             if available_app in white_list and available_app not in black_list:
                 logger.warning("There is no adaptor for %s, check white list and versions" % available_app)
                 # TODO Remove this default code when all apps are tested...
-                fh = open("description/%s.xml" % available_app, "w")
-                the_root = get_xml_description_from_application_name(available_app)
-                ET.ElementTree(the_root).write(fh)
-                fh.close()
+                with open("description/%s.xml" % available_app, "w") as fh:
+                    the_root = get_xml_description_from_application_name(available_app)
+                    ET.ElementTree(the_root).write(fh)
                 try:
                     get_automatic_ut_from_xml_description(the_root)
                 except:
                     logger.error("Unit test for command %s must be fixed: %s" % (available_app, traceback.format_exc()))
             else:
-                logger.warning("%s (not custom app) is not in white list." % available_app)        
+                logger.warning("%s (not custom app) is not in white list." % available_app)
         # except Exception, e:
         #    logger.error(traceback.format_exc())
 
@@ -678,12 +677,11 @@ def create_html_description():
 
     for available_app in otbApplication.Registry.GetAvailableApplications():
         try:
-            fh = open("description/doc/%s.html" % available_app, "w")
-            app_instance = otbApplication.Registry.CreateApplication(available_app)
-            app_instance.UpdateParameters()
-            ct = describe_app(app_instance)
-            fh.write(ct)
-            fh.close()
+            with open("description/doc/%s.html" % available_app, "w") as fh:
+                app_instance = otbApplication.Registry.CreateApplication(available_app)
+                app_instance.UpdateParameters()
+                ct = describe_app(app_instance)
+                fh.write(ct)
         except Exception:
             logger.error(traceback.format_exc())
 
@@ -694,7 +692,7 @@ def create_html_description():
 if __name__ == "__main__":
     # Prepare the environment
     from qgis.core import QgsApplication
-    
+
     app = QgsApplication([], True)
     QgsApplication.initQgis()
 

python/plugins/processing/algs/otb/maintenance/OTBTester.py

@@ -120,7 +120,8 @@ def templatize(item):
             self.fail(unicode(e))
 
     def add_make(self, previous_context, new_file):
-        input = open(new_file).read()
+        with open(new_file) as f:
+            input = f.read()
         output = parse(input)
         apps = [each for each in output if 'Command' in unicode(type(each))]
         setcommands = [each for each in apps if 'SET' in each.name.upper()]
@@ -163,21 +164,24 @@ def mini_clean(item):
         return environment
 
     def get_apps(self, the_makefile, the_dict):
-        input = open(the_makefile).read()
+        with open(the_makefile) as f:
+            input = f.read()
         output = parse(input)
         apps = [each for each in output if 'Command' in unicode(type(each))]
         otb_apps = [each for each in apps if 'OTB_TEST_APPLICATION' in each.name.upper()]
         return otb_apps
 
     def get_tests(self, the_makefile, the_dict):
-        input = open(the_makefile).read()
+        with open(the_makefile) as f:
+            input = f.read()
         output = parse(input)
         apps = [each for each in output if 'Command' in unicode(type(each))]
         otb_tests = [each for each in apps if 'ADD_TEST' in each.name.upper()]
         return otb_tests
 
     def get_apps_with_context(self, the_makefile, the_dict):
-        input = open(the_makefile).read()
+        with open(the_makefile) as f:
+            input = f.read()
         output = parse(input)
 
         def is_a_command(item):