Backport PR pandas-dev#60196 on branch 2.3.x (BUG: fix inspect usage when pyarrow or jinja2 is not installed) (pandas-dev#60201)

Backport PR pandas-dev#60196: BUG: fix inspect usage when pyarrow or jinja2 is not installed

Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>

Author: meeseeksmachine

doc/source/whatsnew/v2.3.0.rst

@@ -174,7 +174,8 @@ Styler
 
 Other
 ^^^^^
--
+- Fixed usage of ``inspect`` when the optional dependencies ``pyarrow`` or ``jinja2``
+  are not installed (:issue:`60196`)
 -
 
 .. ---------------------------------------------------------------------------

pandas/core/arrays/arrow/accessors.py

@@ -46,7 +46,7 @@ def _is_valid_pyarrow_dtype(self, pyarrow_dtype) -> bool:
 
     def _validate(self, data):
         dtype = data.dtype
-        if not isinstance(dtype, ArrowDtype):
+        if pa_version_under10p1 or not isinstance(dtype, ArrowDtype):
             # Raise AttributeError so that inspect can handle non-struct Series.
             raise AttributeError(self._validation_msg.format(dtype=dtype))
 

pandas/core/frame.py

@@ -1439,6 +1439,11 @@ def style(self) -> Styler:
         Please see
         `Table Visualization <../../user_guide/style.ipynb>`_ for more examples.
         """
+        # Raise AttributeError so that inspect works even if jinja2 is not installed.
+        has_jinja2 = import_optional_dependency("jinja2", errors="ignore")
+        if not has_jinja2:
+            raise AttributeError("The '.style' accessor requires jinja2")
+
         from pandas.io.formats.style import Styler
 
         return Styler(self)

pandas/tests/frame/test_api.py

@@ -387,7 +387,6 @@ def test_constructor_expanddim(self):
 
     def test_inspect_getmembers(self):
         # GH38740
-        pytest.importorskip("jinja2")
         df = DataFrame()
         msg = "DataFrame._data is deprecated"
         with tm.assert_produces_warning(

pandas/tests/series/test_api.py

@@ -4,10 +4,6 @@
 import numpy as np
 import pytest
 
-from pandas._config import using_string_dtype
-
-from pandas.compat import HAS_PYARROW
-
 import pandas as pd
 from pandas import (
     DataFrame,
@@ -171,12 +167,8 @@ def test_attrs(self):
         result = s + 1
         assert result.attrs == {"version": 1}
 
-    @pytest.mark.xfail(
-        using_string_dtype() and not HAS_PYARROW, reason="TODO(infer_string)"
-    )
     def test_inspect_getmembers(self):
         # GH38782
-        pytest.importorskip("jinja2")
         ser = Series(dtype=object)
         msg = "Series._data is deprecated"
         with tm.assert_produces_warning(