DEPR: make arguments keyword only in to_clipboard

doc/source/whatsnew/v2.2.0.rst

@@ -92,6 +92,7 @@ Other API changes
 
 Deprecations
 ~~~~~~~~~~~~
+- Deprecated allowing non-keyword arguments in :meth:`DataFrame.to_clipboard`. (:issue:`54229`)
 - Deprecated allowing non-keyword arguments in :meth:`DataFrame.to_hdf` except ``path_or_buf``. (:issue:`54229`)
 - Deprecated allowing non-keyword arguments in :meth:`DataFrame.to_html` except ``buf``. (:issue:`54229`)
 - Deprecated allowing non-keyword arguments in :meth:`DataFrame.to_json` except ``path_or_buf``. (:issue:`54229`)

pandas/core/generic.py

@@ -3098,8 +3098,11 @@ def to_pickle(
         )
 
     @final
+    @deprecate_nonkeyword_arguments(
+        version="3.0", allowed_args=["self"], name="to_clipboard"
+    )
     def to_clipboard(
-        self, excel: bool_t = True, sep: str | None = None, **kwargs
+        self, *, excel: bool_t = True, sep: str | None = None, **kwargs
     ) -> None:
         r"""
         Copy object to the system clipboard.