fix #214: AttributeDict does not support hasattr

CHANGES

@@ -8,6 +8,7 @@ orbeckst, jandom
 * removed support for legacy Python (<= 3.7) (#259)
 * fixed GROMACS TOP reader not reading angle parameters from topology
   file (#261)
+* fixed AttributeDict does not support hasattr (#214)
 
 
 2023-09-16      0.8.5

gromacs/utilities.py

@@ -114,10 +114,19 @@ class AttributeDict(dict):
     """A dictionary with pythonic access to keys as attributes --- useful for interactive work."""
 
     def __getattribute__(self, x):
+        # First try to get the attribute from the class parent (AttributeDict)
         try:
             return super(AttributeDict, self).__getattribute__(x)
+
+        # AttributeError is raised if the attribute doesn't exist
         except AttributeError:
-            return self[x]
+            # Next try to get the attribute from self (dict)
+            try:
+                return self[x]
+
+            # If that fails, raise an AttributeError exception
+            except KeyError:
+                raise AttributeError
 
     def __setattr__(self, name, value):
         try:

tests/test_utilities.py

@@ -52,6 +52,11 @@ def test_dict_set(self):
         self.d["gargl"] = "blaster"
         assert self.d["gargl"] == "blaster"
 
+    def test_dict_hasattr(self):
+        assert hasattr(self.d, "foo")
+        assert hasattr(self.d, "baz")
+        assert not hasattr(self.d, "bar")
+
     def test_pickle(self):
         try:
             dump = pickle.dumps(self.d, pickle.HIGHEST_PROTOCOL)