--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/planemo/lib/python3.7/site-packages/libfuturize/fixes/fix_UserDict.py	Fri Jul 31 00:32:28 2020 -0400
@@ -0,0 +1,102 @@
+"""Fix UserDict.
+
+Incomplete!
+
+TODO: base this on fix_urllib perhaps?
+"""
+
+
+# Local imports
+from lib2to3 import fixer_base
+from lib2to3.fixer_util import Name, attr_chain
+from lib2to3.fixes.fix_imports import alternates, build_pattern, FixImports
+
+MAPPING = {'UserDict':  'collections',
+}
+
+# def alternates(members):
+#     return "(" + "|".join(map(repr, members)) + ")"
+#
+#
+# def build_pattern(mapping=MAPPING):
+#     mod_list = ' | '.join(["module_name='%s'" % key for key in mapping])
+#     bare_names = alternates(mapping.keys())
+#
+#     yield """name_import=import_name< 'import' ((%s) |
+#                multiple_imports=dotted_as_names< any* (%s) any* >) >
+#           """ % (mod_list, mod_list)
+#     yield """import_from< 'from' (%s) 'import' ['(']
+#               ( any | import_as_name< any 'as' any > |
+#                 import_as_names< any* >)  [')'] >
+#           """ % mod_list
+#     yield """import_name< 'import' (dotted_as_name< (%s) 'as' any > |
+#                multiple_imports=dotted_as_names<
+#                  any* dotted_as_name< (%s) 'as' any > any* >) >
+#           """ % (mod_list, mod_list)
+#
+#     # Find usages of module members in code e.g. thread.foo(bar)
+#     yield "power< bare_with_attr=(%s) trailer<'.' any > any* >" % bare_names
+
+
+# class FixUserDict(fixer_base.BaseFix):
+class FixUserdict(FixImports):
+
+    BM_compatible = True
+    keep_line_order = True
+    # This is overridden in fix_imports2.
+    mapping = MAPPING
+
+    # We want to run this fixer late, so fix_import doesn't try to make stdlib
+    # renames into relative imports.
+    run_order = 6
+
+    def build_pattern(self):
+        return "|".join(build_pattern(self.mapping))
+
+    def compile_pattern(self):
+        # We override this, so MAPPING can be pragmatically altered and the
+        # changes will be reflected in PATTERN.
+        self.PATTERN = self.build_pattern()
+        super(FixImports, self).compile_pattern()
+
+    # Don't match the node if it's within another match.
+    def match(self, node):
+        match = super(FixImports, self).match
+        results = match(node)
+        if results:
+            # Module usage could be in the trailer of an attribute lookup, so we
+            # might have nested matches when "bare_with_attr" is present.
+            if "bare_with_attr" not in results and \
+                    any(match(obj) for obj in attr_chain(node, "parent")):
+                return False
+            return results
+        return False
+
+    def start_tree(self, tree, filename):
+        super(FixImports, self).start_tree(tree, filename)
+        self.replace = {}
+
+    def transform(self, node, results):
+        import_mod = results.get("module_name")
+        if import_mod:
+            mod_name = import_mod.value
+            new_name = unicode(self.mapping[mod_name])
+            import_mod.replace(Name(new_name, prefix=import_mod.prefix))
+            if "name_import" in results:
+                # If it's not a "from x import x, y" or "import x as y" import,
+                # marked its usage to be replaced.
+                self.replace[mod_name] = new_name
+            if "multiple_imports" in results:
+                # This is a nasty hack to fix multiple imports on a line (e.g.,
+                # "import StringIO, urlparse"). The problem is that I can't
+                # figure out an easy way to make a pattern recognize the keys of
+                # MAPPING randomly sprinkled in an import statement.
+                results = self.match(node)
+                if results:
+                    self.transform(node, results)
+        else:
+            # Replace usage of the module.
+            bare_name = results["bare_with_attr"][0]
+            new_name = self.replace.get(bare_name.value)
+            if new_name:
+                bare_name.replace(Name(new_name, prefix=bare_name.prefix))