diffoscope/progress.py

@@ -267,7 +267,7 @@ class ProgressBar:
         self.msg = msg
 
         self.bar.maxval = total
-        self.bar.currval = current
+        self.bar.value = current
         self.bar.update()
 
     def finish(self):

diffoscope/tools.py

@@ -70,7 +70,8 @@ def get_tools(only_missing=False):
     d["External-Tools-Required"] = tuple(external_tools)
 
     current_os = get_current_os()
-    os_list = [current_os] if (current_os in OS_NAMES) else iter(OS_NAMES)
+    os_list = [current_os] if current_os in OS_NAMES else OS_NAMES
+
     for os_ in os_list:
         tools = set()
         for x in external_tools: