BUG: Fix dir(interval_index), closes pandas-dev#27571

jbrockmendel · Jul 30, 2019 · 6d8e9ab · 6d8e9ab
1 parent 0fd888c
commit 6d8e9ab
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Showing 3 changed files with 13 additions and 3 deletions.
diff --git a/doc/source/whatsnew/v0.25.1.rst b/doc/source/whatsnew/v0.25.1.rst
@@ -78,7 +78,7 @@ Strings
 
 Interval
 ^^^^^^^^
-
+- Bug in :class:`IntervalIndex` where `dir(obj)` would raise ``ValueError`` (:issue:`27571`)
 -
 -
 -

diff --git a/pandas/core/strings.py b/pandas/core/strings.py
@@ -1953,8 +1953,11 @@ def _validate(data):
         values = getattr(data, "values", data)  # Series / Index
         values = getattr(values, "categories", values)  # categorical / normal
 
-        # missing values obfuscate type inference -> skip
-        inferred_dtype = lib.infer_dtype(values, skipna=True)
+        inferred_dtype = None
+        if isinstance(values, np.ndarray):
+            # exclude e.g. IntervalArray, which will cause infer_dtype to raise
+            # missing values obfuscate type inference -> skip
+            inferred_dtype = lib.infer_dtype(values, skipna=True)
 
         if inferred_dtype not in allowed_types:
             raise AttributeError("Can only use .str accessor with string values!")

diff --git a/pandas/tests/indexes/interval/test_interval.py b/pandas/tests/indexes/interval/test_interval.py
@@ -1095,3 +1095,10 @@ def test_is_all_dates(self):
         )
         year_2017_index = pd.IntervalIndex([year_2017])
         assert not year_2017_index.is_all_dates
+
+
+def test_dir():
+    # GH#27571 dir(interval_index) should not raise
+    index = IntervalIndex.from_arrays([0, 1], [1, 2])
+    result = dir(index)
+    assert "str" not in result