fixes #439 by adding support for data classes

Author: seperman

deepdiff/model.py

@@ -905,6 +905,9 @@ def stringify_param(self, force=None):
             result = stringify_element(param, quote_str=self.quote_str)
         elif isinstance(param, tuple):  # Currently only for numpy ndarrays
             result = ']['.join(map(repr, param))
+        elif hasattr(param, '__dataclass_fields__'):
+            attrs_to_values = [f"{key}={value}" for key, value in [(i, getattr(param, i)) for i in param.__dataclass_fields__]]
+            result = f"{param.__class__.__name__}({','.join(attrs_to_values)})"
         else:
             candidate = repr(param)
             try:

tests/test_diff_text.py

@@ -5,6 +5,7 @@
 import re
 import uuid
 from enum import Enum
+from dataclasses import dataclass
 from typing import List
 from decimal import Decimal
 from deepdiff import DeepDiff
@@ -25,6 +26,11 @@ class MyEnum2(str, Enum):
     cake = "cake"
 
 
+@dataclass(frozen=True)
+class MyDataClass:
+    val: int
+    val2: int
+
 
 class TestDeepDiffText:
     """DeepDiff Tests."""
@@ -2073,3 +2079,32 @@ class Bar(PydanticBaseModel):
         diff = DeepDiff(t1, t2)
         expected = {'values_changed': {'root.stuff[0].thing': {'new_value': 2, 'old_value': 1}}}
         assert expected == diff
+
+    def test_dataclass1(self):
+
+
+        t1 = MyDataClass(1, 4)
+        t2 = MyDataClass(2, 4)
+
+        diff = DeepDiff(t1, t2, exclude_regex_paths=["any"])
+        assert {'values_changed': {'root.val': {'new_value': 2, 'old_value': 1}}} == diff
+
+    def test_dataclass2(self):
+
+        @dataclass(frozen=True)
+        class MyDataClass:
+            val: int
+            val2: int
+
+        t1 = {
+            MyDataClass(1, 4): 10,
+            MyDataClass(2, 4): 20,
+        }
+
+        t2 = {
+            MyDataClass(1, 4): 10,
+            MyDataClass(2, 4): 10,
+        }
+
+        diff = DeepDiff(t1, t2, exclude_regex_paths=["any"])
+        assert {'values_changed': {'root[MyDataClass(val=2,val2=4)]': {'new_value': 10, 'old_value': 20}}} == diff