FIX: Move ExcelWriter and ExcelFormatter imports to avoid circular import

- Keep ExcelWriter and ExcelFormatter in TYPE_CHECKING for type hints
- Import both at runtime inside to_excel method to avoid circular import

Author: antznette1

pandas/core/generic.py

@@ -182,8 +182,6 @@
     Window,
 )
 
-# Import ExcelFormatter at runtime since it's used in to_excel method
-from pandas.io.formats.excel import ExcelFormatter
 from pandas.io.formats.format import (
     DataFrameFormatter,
     DataFrameRenderer,
@@ -204,17 +202,15 @@
 
     from pandas import (
         DataFrame,
+        ExcelWriter,
         HDFStore,
         Series,
     )
     from pandas.core.indexers.objects import BaseIndexer
     from pandas.core.resample import Resampler
 
-# Import ExcelWriter at runtime since it's used in to_excel method
 import textwrap
 
-from pandas import ExcelWriter
-
 # goal is to be able to define the docs close to function, while still being
 # able to share
 _shared_docs = {**_shared_docs}
@@ -2275,6 +2271,9 @@ def to_excel(
         >>> df.to_excel("pandas_simple.xlsx")
         >>> df.to_excel("pandas_simple.xlsx", engine="openpyxl")
         """
+        # Import ExcelWriter here to avoid circular import
+        from pandas import ExcelWriter
+
         if isinstance(excel_writer, ExcelWriter):
             if engine is not None:
                 raise ValueError(
@@ -2289,6 +2288,9 @@ def to_excel(
                 storage_options=storage_options,
             )
 
+        # Import ExcelFormatter here to avoid circular import
+        from pandas.io.formats.excel import ExcelFormatter
+
         formatter = ExcelFormatter(
             self,
             na_rep=na_rep,