ENH: Expose NoDefault in pandas.api.extensions (#60696)

* ENH: Expose NoDefault in pandas.api.extensions

* Add entry to whatsnew

* Address review comment

Author: snitish

doc/source/whatsnew/v3.0.0.rst

@@ -30,6 +30,7 @@ Other enhancements
 ^^^^^^^^^^^^^^^^^^
 - :class:`pandas.api.typing.FrozenList` is available for typing the outputs of :attr:`MultiIndex.names`, :attr:`MultiIndex.codes` and :attr:`MultiIndex.levels` (:issue:`58237`)
 - :class:`pandas.api.typing.SASReader` is available for typing the output of :func:`read_sas` (:issue:`55689`)
+- :class:`pandas.api.typing.NoDefault` is available for typing ``no_default``
 - :func:`DataFrame.to_excel` now raises an ``UserWarning`` when the character count in a cell exceeds Excel's limitation of 32767 characters (:issue:`56954`)
 - :func:`pandas.merge` now validates the ``how`` parameter input (merge type) (:issue:`59435`)
 - :func:`read_spss` now supports kwargs to be passed to pyreadstat (:issue:`56356`)

pandas/api/typing/__init__.py

@@ -3,6 +3,7 @@
 """
 
 from pandas._libs import NaTType
+from pandas._libs.lib import NoDefault
 from pandas._libs.missing import NAType
 
 from pandas.core.groupby import (
@@ -44,6 +45,7 @@
     "JsonReader",
     "NAType",
     "NaTType",
+    "NoDefault",
     "PeriodIndexResamplerGroupby",
     "Resampler",
     "Rolling",

pandas/tests/api/test_api.py

@@ -261,6 +261,7 @@ class TestApi(Base):
         "JsonReader",
         "NaTType",
         "NAType",
+        "NoDefault",
         "PeriodIndexResamplerGroupby",
         "Resampler",
         "Rolling",