Use Deque from typing-extensions

Author: keysmashes

cwltool/utils.py

@@ -10,11 +10,8 @@
 import pkg_resources
 from functools import partial  # pylint: disable=unused-import
 from typing import (IO, Any, AnyStr, Callable,  # pylint: disable=unused-import
-                    Dict, Iterable, List, Optional, Text, Tuple, TypeVar, Union,
-                    TYPE_CHECKING)
-
-if TYPE_CHECKING:
-    from typing import Deque
+                    Dict, Iterable, List, Optional, Text, Tuple, TypeVar, Union)
+from typing_extensions import Deque
 
 import six
 from six.moves import urllib, zip_longest

requirements.txt

@@ -10,3 +10,4 @@ bagit==1.6.4
 mypy-extensions
 psutil
 subprocess32 >= 3.5.0; os.name=="posix"
+typing-extensions

setup.py

@@ -60,6 +60,7 @@
           'psutil',
           'prov == 1.5.1',
           'bagit >= 1.6.4',
+          'typing-extensions',
       ],
       extras_require={
           ':os.name=="posix"': ['subprocess32 >= 3.5.0'],