adding test case for hashing class. Ignore private keys when calculating hash.

Author: seperman

AUTHORS

@@ -1,9 +1,10 @@
-Authors:
+Many thanks to the following people for their contributions to DeepDiff:
+
 - Seperman
 - Victor Hahn Castell @ Flexoptix
 - nfvs for Travis-CI setup script.
 - brbsix for initial Py3 porting.
-- WangFenjin for unicode support.
+- WangFenjin for Unicode support.
 - timoilya for comparing list of sets when ignoring order.
 - Bernhard10 for significant digits comparison.
 - b-jazz for PEP257 cleanup, Standardize on full names, fixing line endings.
@@ -21,3 +22,5 @@ Authors:
 - Juan Soler (Soleronline) for adding ignore_type_number
 - mthaddon for adding timedelta diffing support
 - Necrophagos for Hashing of the number 1 vs. True
+- Hugo (hugovk) for fixes for Python 3.10 and dropping support for EOL Python 3.4
+- Andrey Gavrilin (gaal-dev) for hashing classes.

README.md

@@ -417,6 +417,7 @@ And then running
 
 # ChangeLog
 
+- v4-2-0: Fix for Py3.10. Dropping support for EOL Python 3.4. Ignoring private keys when calculating hashes. For example __init__ is not a part of hash calculation anymore.
 - v4-1-0: .json property is finally removed.
 - v4-0-9: Fixing the bug for hashing custom unhashable objects
 - v4-0-8: Adding ignore_nan_inequality for float('nan')

deepdiff/deephash.py

@@ -170,7 +170,7 @@ def __contains__(self, obj):
         return super().__contains__(key)
 
     def _prep_obj(self, obj, parent, parents_ids=EMPTY_FROZENSET, is_namedtuple=False):
-        """Difference of 2 objects"""
+        """prepping objects"""
         original_type = type(obj) if not isinstance(obj, type) else obj
         try:
             if is_namedtuple:
@@ -208,6 +208,9 @@ def _prep_dict(self, obj, parent, parents_ids=EMPTY_FROZENSET, print_as_attribut
 
         key_text = "%s{}".format(INDEX_VS_ATTRIBUTE[print_as_attribute])
         for key, item in obj.items():
+            # ignore private variables
+            if isinstance(key, str) and key.startswith('__'):
+                continue
             key_formatted = "'%s'" % key if not print_as_attribute and isinstance(key, strings) else key
             key_in_report = key_text % (parent, key_formatted)
 

docs/index.rst

@@ -281,6 +281,8 @@ Indices and tables
 Changelog
 =========
 
+- v4-2-0: Fix for Py3.10. Dropping support for EOL Python 3.4. Ignoring private keys when calculating hashes. For example __init__ is not a part of hash calculation anymore.
+- v4-1-0: .json property is finally removed.
 - v4-0-9: Fixing the bug for hashing custom unhashable objects
 - v4-0-8: Adding ignore_nan_inequality for float('nan')
 - v4-0-7: Hashing of the number 1 vs. True

tests/test_hash.py

@@ -12,16 +12,17 @@
 logging.disable(logging.CRITICAL)
 
 
-class CustomClass:
+class ClassC:
+    class_attr = 0
+
     def __init__(self, a, b=None):
         self.a = a
         self.b = b
 
     def __str__(self):
         return "({}, {})".format(self.a, self.b)
 
-    def __repr__(self):
-        return self.__str__()
+    __repr__ = __str__
 
 
 # Only the prep part of DeepHash. We don't need to test the actual hash function.
@@ -537,6 +538,14 @@ def test_string_case(self):
         t1_hash = DeepHashPrep(t1, ignore_string_case=True)
         assert t1_hash == {'Hello': 'str:hello'}
 
+    def test_hash_class(self):
+        t1 = ClassC
+        t1_hash = DeepHashPrep(t1)
+        assert t1_hash['class_attr'] == 'str:class_attr'
+        assert t1_hash[0] == 'int:0'
+        # Note: we ignore private names in calculating hashes now. So you dont see __init__ here for example.
+        assert t1_hash[t1] == r'objClassC:{str:class_attr:int:0}'
+
 
 class TestDeepHashSHA:
     """DeepHash with SHA Tests."""