--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/planemo/lib/python3.7/site-packages/schema_salad/utils.py	Fri Jul 31 00:32:28 2020 -0400
@@ -0,0 +1,89 @@
+from __future__ import absolute_import
+
+import json
+import os
+from typing import IO, Any, Dict, Mapping, MutableSequence
+
+import six
+
+# move to a regular typing import when Python 3.3-3.6 is no longer supported
+
+
+def add_dictlist(di, key, val):  # type: (Dict[Any, Any], Any, Any) -> None
+    if key not in di:
+        di[key] = []
+    di[key].append(val)
+
+
+def aslist(l):  # type: (Any) -> MutableSequence[Any]
+    """
+    Convenience function to wrap single items and lists.
+
+    Return lists unchanged.
+    """
+
+    if isinstance(l, MutableSequence):
+        return l
+    else:
+        return [l]
+
+
+# http://rightfootin.blogspot.com/2006/09/more-on-python-flatten.html
+
+
+def flatten(l, ltypes=(list, tuple)):
+    # type: (Any, Any) -> Any
+    if l is None:
+        return []
+    if not isinstance(l, ltypes):
+        return [l]
+
+    ltype = type(l)
+    lst = list(l)
+    i = 0
+    while i < len(lst):
+        while isinstance(lst[i], ltypes):
+            if not lst[i]:
+                lst.pop(i)
+                i -= 1
+                break
+            else:
+                lst[i : i + 1] = lst[i]
+        i += 1
+    return ltype(lst)
+
+
+# Check if we are on windows OS
+def onWindows():
+    # type: () -> (bool)
+    return os.name == "nt"
+
+
+def convert_to_dict(j4):  # type: (Any) -> Any
+    if isinstance(j4, Mapping):
+        return {k: convert_to_dict(v) for k, v in j4.items()}
+    elif isinstance(j4, MutableSequence):
+        return [convert_to_dict(v) for v in j4]
+    else:
+        return j4
+
+
+def json_dump(
+    obj,  # type: Any
+    fp,  # type: IO[str]
+    **kwargs  # type: Any
+):  # type: (...) -> None
+    """ Force use of unicode. """
+    if six.PY2:
+        kwargs["encoding"] = "utf-8"
+    json.dump(convert_to_dict(obj), fp, **kwargs)
+
+
+def json_dumps(
+    obj,  # type: Any
+    **kwargs  # type: Any
+):  # type: (...) -> str
+    """ Force use of unicode. """
+    if six.PY2:
+        kwargs["encoding"] = "utf-8"
+    return json.dumps(convert_to_dict(obj), **kwargs)