DOC: Updated docs for arcname in NDFrame.to_csv (#26023)

Author: drew-heenan

doc/source/whatsnew/v0.25.0.rst

@@ -36,6 +36,7 @@ Other Enhancements
 - :class:`RangeIndex` has gained :attr:`~RangeIndex.start`, :attr:`~RangeIndex.stop`, and :attr:`~RangeIndex.step` attributes (:issue:`25710`)
 - :class:`datetime.timezone` objects are now supported as arguments to timezone methods and constructors (:issue:`25065`)
 - :meth:`DataFrame.query` and :meth:`DataFrame.eval` now supports quoting column names with backticks to refer to names with spaces (:issue:`6508`)
+- :meth:`NDFrame.to_csv` now supports the ``arcname`` argument to specify the written CSV file name when inside a ZIP archive. Default ``arcname=None`` maintains previous behavior where the CSV name matches given ZIP path ``path_or_buf`` (:issue:`26023`)
 
 .. _whatsnew_0250.api_breaking:
 

pandas/core/generic.py

@@ -3012,8 +3012,11 @@ def to_csv(self, path_or_buf=None, sep=",", na_rep='', float_format=None,
             Character recognized as decimal separator. E.g. use ',' for
             European data.
         arcname : str, default None
-            Name of file within a ZIP archive. Only used when `path_or_buf` is
-            a path and `compression` is set to or inferred as 'zip'.
+            Name of CSV-formatted file within a ZIP archive. Only used when
+            `path_or_buf` is a path and `compression` is set to or inferred
+            as 'zip'. Uses `path_or_buf` if None.
+
+            .. versionadded:: 0.25.0
 
         Returns
         -------