diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -72,6 +72,15 @@
     stringutil,
 )
 
+if not globals():
+    from typing import (
+        Any,
+        Dict,
+    )
+
+    for t in (Any, Dict):
+        assert t
+
 table = {}
 table.update(debugcommandsmod.command._table)
 
@@ -2967,7 +2976,7 @@
     if opts.get(b'base'):
         basectx = scmutil.revsingle(repo, opts[b'base'], None)
     # a dict of data to be stored in state file
-    statedata = {}
+    statedata = {}  # type: Dict[bytes, Any]
     # list of new nodes created by ongoing graft
     statedata[b'newnodes'] = []
 
@@ -3237,7 +3246,8 @@
                 )
             # checking that newnodes exist because old state files won't have it
             elif statedata.get(b'newnodes') is not None:
-                statedata[b'newnodes'].append(node)
+                l = statedata[b'newnodes']
+                l.append(node)  # pytype: disable=attribute-error
 
     # remove state when we complete successfully
     if not opts.get(b'dry_run'):
@@ -4725,6 +4735,10 @@
     if opts.get(b'copies'):
         endrev = None
         if revs:
+            # If we're here, we know revs is a smartset.baseset
+            # because we're not possibly in the linerange mode. Sadly,
+            # pytype isn't convinced, so we have to suppress the
+            # warning about list not having a max() method.
             endrev = revs.max() + 1
         getcopies = scmutil.getcopiesfn(repo, endrev=endrev)
 
@@ -7175,11 +7189,13 @@
         t = []
         if incoming:
             t.append(_(b'1 or more incoming'))
-        o = outgoing.missing
+        o = outgoing.missing  # pytype: disable=attribute-error
         if o:
             t.append(_(b'%d outgoing') % len(o))
         other = dother or sother
-        if b'bookmarks' in other.listkeys(b'namespaces'):
+        if b'bookmarks' in other.listkeys(  # pytype: disable=attribute-error
+            b'namespaces'
+        ):
             counts = bookmarks.summary(repo, other)
             if counts[0] > 0:
                 t.append(_(b'%d incoming bookmarks') % counts[0])