Update describe for edge case (#323)

* update nested describe for edge case

* pre-commit-ci fix

* update variable name

Author: Graciaaa3

src/nested_pandas/nestedframe/core.py

@@ -965,6 +965,13 @@ def describe(self, exclude_nest: bool = False, percentiles=None, include=None, e
         if not result:
             raise ValueError(f"All columns in {check} failed.\n" + "\n".join(errors))
 
+        if include is None and exclude is None:
+            # try only get the numeric columns and drop the others
+            numeric_dtypes = [r.select_dtypes(include=[np.number]) for r in result]
+            non_empty_numeric_dtypes = [r for r in numeric_dtypes if not r.empty]
+            if non_empty_numeric_dtypes:
+                result = non_empty_numeric_dtypes
+
         return NestedFrame(pd.concat(result, axis=1))
 
     def eval(self, expr: str, *, inplace: bool = False, **kwargs) -> Any | None:

tests/nested_pandas/nestedframe/test_nestedframe.py

@@ -1484,6 +1484,9 @@ def test_describe():
     """Test NestedFrame.describe gives correct results with and without the nested columns"""
     base_mix = NestedFrame(data={"a": [1, 2, 3], "b": ["2", "4", "6"], "c": ["x", "y", "z"]}, index=[0, 1, 2])
     base_num = NestedFrame(data={"a": [1, 2, 3], "b": [2, 3, 2], "c": [55, 55, 55]}, index=[0, 1, 2])
+    base_obj = NestedFrame(
+        data={"a": ["a", "b", "c"], "b": ["2", "4", "6"], "c": ["x", "y", "z"]}, index=[0, 1, 2]
+    )
 
     nested_num = pd.DataFrame(
         data={"d": [10, 11, 20, 21, 3, 31, 32], "y": [1, 2, 3, 4, 5, 6, 7]}, index=[0, 0, 1, 1, 1, 2, 2]
@@ -1626,6 +1629,14 @@ def test_describe():
     with pytest.raises(ValueError):
         base2.describe(include=object)
 
+    # edge case: object base with numeric nest
+    base_obj = base_obj.add_nested(nested_mix, "nested_mix").add_nested(nested_num, "nested_num")
+    r18 = base_obj.describe()
+    assert isinstance(r18, NestedFrame)
+    assert r18.shape[1] == 3
+    assert "nested_mix.f" in r18.columns
+    assert "top" not in r18.index
+
 
 def test_eval():
     """