madison-ookla commented on a change in pull request #13371:
URL: https://github.com/apache/airflow/pull/13371#discussion_r552162168



##########
File path: airflow/upgrade/rules/airflow_macro_plugin_removed.py
##########
@@ -39,9 +39,16 @@ def _check_file(self, file_path):
         problems = []
         class_name_to_check = self.MACRO_PLUGIN_CLASS.split(".")[-1]
         with open(file_path, "r") as file_pointer:
-            for line_number, line in enumerate(file_pointer, 1):
-                if class_name_to_check in line:
-                    problems.append(self._change_info(file_path, line_number))
+            try:
+                for line_number, line in enumerate(file_pointer, 1):
+                    if class_name_to_check in line:
+                        problems.append(self._change_info(file_path, 
line_number))
+            except UnicodeDecodeError:
+                raise Exception(
+                    "Unable to read file {}, it may need to be added to the 
.airflowignore".format(

Review comment:
       Just want to check back in on this @potiuk @turbaszek @dimberman - we 
can make the upgrade check Python 3.6+ (or even just the tests Py3.6+ if we'd 
like), but currently the package still supports 2.7 
(https://github.com/apache/airflow/blob/v1-10-stable/airflow/upgrade/setup.cfg#L35).
 Should we bump up these requirements to 3.6? I agree that it makes sense to do 
so, since this is a utility for upgrading to Airflow 2.0 which is 3.6+.




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