Remove several assignments to underscore

Underscore is used with the gettext integration, so remove these
otherwise-harmless assignments that are intended as disposal of an
unused variable.

console_conf/controllers/identity.py

@@ -42,7 +42,7 @@ def get_core_version():
 
     version = None
     for line in shlex.split(content):
-        key, _, value = line.partition("=")
+        key, sep, value = line.partition("=")
         if key == "ID" and value != "ubuntu-core":
             return None
         if key == "VERSION_ID":

subiquitycore/lsb_release.py

@@ -23,7 +23,7 @@ def lsb_release(path=None, dry_run: bool = False) -> Dict[str, str]:
         return ret
 
     for tok in shlex.split(content):
-        k, _, v = tok.partition("=")
+        k, sep, v = tok.partition("=")
         if not k.startswith("DISTRIB_") or not v:
             continue
         ret[k.replace("DISTRIB_", "").lower()] = v

subiquitycore/ui/stretchy.py

@@ -163,7 +163,7 @@ class StretchyOverlay(urwid.Widget):
         if not bottom_c.cols() or not bottom_c.rows():
             return urwid.CompositeCanvas(bottom_c)
 
-        top_size, _ = self._top_size(size, focus)
+        top_size = self._top_size(size, focus)[0]
         top_c = self.top_w.render(top_size, focus)
         top_c = urwid.CompositeCanvas(top_c)
         left = (size[0] - top_size[0]) // 2