serializing reversed lists

Author: seperman

deepdiff/serialization.py

@@ -41,7 +41,7 @@
 except ImportError:  # pragma: no cover.
     PydanticBaseModel = None
 
-from copy import deepcopy
+from copy import deepcopy, copy
 from functools import partial
 from collections.abc import Mapping
 from deepdiff.helper import (
@@ -611,6 +611,9 @@ def _convertor(obj):
         for original_type, convert_to in _convertor_mapping.items():
             if isinstance(obj, original_type):
                 return convert_to(obj)
+        # This is to handle reverse() which creates a generator of type list_reverseiterator
+        if obj.__class__.__name__ == 'list_reverseiterator':
+            return list(copy(obj))
         raise TypeError('We do not know how to convert {} of type {} for json serialization. Please pass the default_mapping parameter with proper mapping of the object to a basic python type.'.format(obj, type(obj)))
 
     return _convertor

docs/diff_doc.rst

@@ -46,10 +46,6 @@ exclude_paths: list, default = None
     :ref:`exclude_paths_label`
     List of paths to exclude from the report. If only one item, you can path it as a string.
 
-include_paths: list, default = None
-    :ref:`include_paths_label`
-    List of the only paths to include in the report. If only one item, you can path it as a string.
-
 exclude_regex_paths: list, default = None
     :ref:`exclude_regex_paths_label`
     List of string regex paths or compiled regex paths objects to exclude from the report. If only one item, you can pass it as a string or regex compiled object.
@@ -67,6 +63,10 @@ exclude_obj_callback_strict: function, default = None
     :ref:`exclude_obj_callback_strict_label`
     A function that works the same way as exclude_obj_callback, but excludes elements from the result only if the function returns True for both elements.
 
+include_paths: list, default = None
+    :ref:`include_paths_label`
+    List of the only paths to include in the report. If only one item is in the list, you can pass it as a string.
+
 include_obj_callback: function, default = None
     :ref:`include_obj_callback_label`
     A function that takes the object and its path and returns a Boolean. If True is returned, the object is included in the results, otherwise it is excluded.

tests/test_serialization.py

@@ -359,3 +359,13 @@ def test_namedtuple_seriazliation(self):
         serialized = json_dumps(op_code)
         expected = '{"tag":"replace","t1_from_index":0,"t1_to_index":1,"t2_from_index":10,"t2_to_index":20,"old_values":null,"new_values":null}'
         assert serialized == expected
+
+    def test_reversed_list(self):
+        items = reversed([1, 2, 3])
+
+        serialized = json_dumps(items)
+        serialized2 = json_dumps(items)
+
+        assert '[3,2,1]' == serialized
+        assert '[3,2,1]' == serialized2, "We should have copied the original list. If this returns empty, it means we exhausted the original list."
+