Cleanup pylint errors

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index b79316a9152902f8debe4d1708e8970aded2bf1a..dd7e1ae71467869b8d01779affc03654a2a4d10d 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -23,6 +23,10 @@ PYLINT_DISABLED_WARNINGS = [
     # TODO: fix me.
     # Many tests include modules they don't use.
     'W0611',
+    # Possible unbalanced tuple unpacking with sequence.
+    'W0632',
+    # Attempting to unpack a non-sequence.
+    'W0633',
     # Include order doesn't properly include local files?
     'F0401',
     # Some use of built-in names.
@@ -38,6 +42,10 @@ PYLINT_DISABLED_WARNINGS = [
     'W0613',
     # String has no effect (docstring in wrong place).
     'W0105',
+    # map/filter on lambda could be replaced by comprehension.
+    'W0110',
+    # Use of eval.
+    'W0123',
     # Comma not followed by space.
     'C0324',
     # Access to a protected member.
@@ -54,6 +62,8 @@ PYLINT_DISABLED_WARNINGS = [
     'E1101',
     # Dangerous default {}.
     'W0102',
+    # Cyclic import.
+    'R0401',
     # Others, too many to sort.
     'W0201', 'W0232', 'E1103', 'W0621', 'W0108', 'W0223', 'W0231',
     'R0201', 'E0101', 'C0321',