diff --git a/mercurial/copies.py b/mercurial/copies.py
--- a/mercurial/copies.py
+++ b/mercurial/copies.py
@@ -141,7 +141,7 @@
 def _dirstatecopies(d):
     ds = d._repo.dirstate
     c = ds.copies().copy()
-    for k in c.keys():
+    for k in list(c):
         if ds[k] not in 'anm':
             del c[k]
     return c
@@ -494,7 +494,7 @@
     renamedelete = {}
     renamedeleteset = set()
     divergeset = set()
-    for of, fl in diverge.items():
+    for of, fl in list(diverge.items()):
         if len(fl) == 1 or of in c1 or of in c2:
             del diverge[of] # not actually divergent, or not a rename
             if of not in c1 and of not in c2:
diff --git a/mercurial/merge.py b/mercurial/merge.py
--- a/mercurial/merge.py
+++ b/mercurial/merge.py
@@ -1029,7 +1029,7 @@
             # bids is a mapping from action method to list af actions
             # Consensus?
             if len(bids) == 1: # all bids are the same kind of method
-                m, l = bids.items()[0]
+                m, l = list(bids.items())[0]
                 if all(a == l[0] for a in l[1:]): # len(bids) is > 1
                     repo.ui.note(_(" %s: consensus for %s\n") % (f, m))
                     actions[f] = l[0]
@@ -1055,7 +1055,7 @@
                 for _f, args, msg in l:
                     repo.ui.note('  %s -> %s\n' % (msg, m))
             # Pick random action. TODO: Instead, prompt user when resolving
-            m, l = bids.items()[0]
+            m, l = list(bids.items())[0]
             repo.ui.warn(_(' %s: ambiguous merge - picked %s action\n') %
                          (f, m))
             actions[f] = l[0]