fix-completions-for-private-attr

Author: Darshan808

IPython/core/completer.py

@@ -2608,8 +2608,8 @@ def _determine_completion_context(self, line):
         if re.search(r"(?<!\w)(?<!\d\.)([-+]?\d+\.(\d+)?)(?!\w)$", line):
             return self._CompletionContextType.GLOBAL
 
-        # Handle all other attribute matches np.ran, d[0].k, (a,b).count
-        chain_match = re.search(r".*(.+(?<!\s)\.(?:[a-zA-Z]\w*)?)$", line)
+        # Handle all other attribute matches np.ran, d[0].k, (a,b).count, obj._private
+        chain_match = re.search(r".*(.+(?<!\s)\.(?:[a-zA-Z_]\w*)?)$", line)
         if chain_match:
             return self._CompletionContextType.ATTRIBUTE
 

tests/test_completer.py

@@ -2739,6 +2739,8 @@ def test_no_file_completions_in_attr_access(code):
         ("dict_with_dots = {'key.with.dots': value.attr", "attribute"),
         ("d[f'{a}']['{a.", "global"),
         ("ls .", "global"),
+        ("t._", "attribute"),
+        ("t.__a", "attribute"),
     ],
 )
 def test_completion_context(line, expected):