--- a/env/lib/python3.7/site-packages/cwltool/flatten.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,27 +0,0 @@
-from __future__ import absolute_import
-
-from typing import Any, Callable, List, Text, cast
-
-# http://rightfootin.blogspot.com/2006/09/more-on-python-flatten.html
-
-
-def flatten(l, ltypes=(list, tuple)):
-    # type: (Any, Any) -> List[Any]
-    if l is None:
-        return []
-    if not isinstance(l, ltypes):
-        return [l]
-
-    ltype = type(l)
-    l = list(l)
-    i = 0
-    while i < len(l):
-        while isinstance(l[i], ltypes):
-            if not l[i]:
-                l.pop(i)
-                i -= 1
-                break
-            else:
-                l[i:i + 1] = l[i]
-        i += 1
-    return cast(Callable[[Any], List[Any]], ltype)(l)