Only import typing.Deque when type checking

Author: keysmashes

cwltool/utils.py

@@ -10,7 +10,11 @@
 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)
+                    Dict, Iterable, List, Optional, Text, Tuple, TypeVar, Union,
+                    TYPE_CHECKING)
+
+if TYPE_CHECKING:
+    from typing import Deque
 
 import six
 from six.moves import urllib, zip_longest
@@ -32,7 +36,7 @@
 
 DEFAULT_TMP_PREFIX = "tmp"
 
-processes_to_kill = collections.deque()  # type: collections.deque[subprocess.Popen]
+processes_to_kill = collections.deque()  # type: Deque[subprocess.Popen]
 
 def versionstring():
     # type: () -> Text