New __hash__ implementation up to documentation standards

flexdict/__init__.py

@@ -34,7 +34,12 @@ def __init__(self, data=None):
                 )
 
     def __hash__(self):
-        return id(self)
+        import hashlib
+        locked_state = "l" if self.locked else "u"
+        hasher = hashlib.sha1()
+        for char in str(self) + locked_state:
+            hasher.update(char)
+        return hasher.hexdigest()
 
     def __eq__(self, other):
         if isinstance(other, dict):

tests/test.py

@@ -46,6 +46,17 @@ def test_equals():
     assert (flex is FlexDict()) is False
 
 
+def test_hash_equals():
+    """Hash equality comparisons. hash(FlexDict()) == hash(FlexDict())"""
+    f = FlexDict()
+    g = FlexDict()
+    assert (hash(f) == hash(g)) is True
+    assert (hash(f) == hash(f)) is True
+    f["foo", "bar"] = 1
+    g["bar", "foo"] = 1
+    assert (hash(f) == hash(g)) is False
+
+
 @mark.parametrize(
     'keys', [
         ['a'],