Address fact that typing.Deque wasn't defined prior to 3.5.4

1 files changed, 9 insertions, 1 deletions

diff --git a/cmd2/table_creator.py b/cmd2/table_creator.py
index b35cade6..322f2089 100644
--- a/cmd2/table_creator.py
+++ b/cmd2/table_creator.py
@@ -10,12 +10,20 @@ import functools
 import io
 from collections import deque
 from enum import Enum
-from typing import Any, Deque, Optional, Sequence, Tuple, Union
+from typing import Any, Optional, Sequence, Tuple, Union
 
 from wcwidth import wcwidth
 
 from . import ansi, constants, utils
 
+# This is needed for compatibility with early versions of Python 3.5 prior to 3.5.4
+try:
+    from typing import Deque
+except ImportError:
+    from typing import _alias, T
+    import collections
+    Deque = _alias(collections.deque, T)
+
 # Constants
 EMPTY = ''
 SPACE = ' '