diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -722,7 +722,8 @@ class workingctx(changectx):
 
     def tags(self):
         t = []
-        [t.extend(p.tags()) for p in self.parents()]
+        for p in self.parents():
+            t.extend(p.tags())
         return t
 
     def children(self):
diff --git a/mercurial/ignore.py b/mercurial/ignore.py
--- a/mercurial/ignore.py
+++ b/mercurial/ignore.py
@@ -86,7 +86,8 @@ def ignore(root, files, warn):
                      (f, inst.strerror))
 
     allpats = []
-    [allpats.extend(patlist) for patlist in pats.values()]
+    for patlist in pats.values():
+        allpats.extend(patlist)
     if not allpats:
         return util.never
 
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1242,7 +1242,8 @@ class localrepository(repo.repository):
                     self.ui.status(_("skipping missing subrepository: %s\n")
                                    % subpath)
 
-        [l.sort() for l in r]
+        for l in r:
+            l.sort()
         return r
 
     def heads(self, start=None):