Merge pull request wireservice#737 from quantrocket-llc/collections-abc

import Sequence from collections.abc to suppress warning in python 3.…

Author: jpmckinney

agate/mapped_sequence.py

@@ -6,7 +6,11 @@
 rows and columns.
 """
 
-from collections import OrderedDict, Sequence
+from collections import OrderedDict
+try:
+    from collections.abc import Sequence
+except ImportError:
+    from collections import Sequence
 
 import six
 from six.moves import range  # pylint: disable=W0622

agate/utils.py

@@ -6,7 +6,11 @@
 agate.
 """
 
-from collections import OrderedDict, Sequence
+from collections import OrderedDict
+try:
+    from collections.abc import Sequence
+except ImportError:
+    from collections import Sequence
 from functools import wraps
 import math
 import string