fix.iterator setting fixed to pass the CI tests

Author: invain01

pandas/core/reshape/encoding.py

@@ -5,7 +5,6 @@
     Hashable,
     Iterable,
 )
-import itertools
 from typing import TYPE_CHECKING
 
 import numpy as np
@@ -185,7 +184,7 @@ def check_len(item, name: str) -> None:
         check_len(prefix_sep, "prefix_sep")
 
         if isinstance(prefix, str):
-            prefix = itertools.cycle([prefix])
+            prefix = [prefix] * len(data_to_encode.columns)
         if isinstance(prefix, dict):
             prefix = [prefix[col] for col in data_to_encode.columns]
 
@@ -194,7 +193,7 @@ def check_len(item, name: str) -> None:
 
         # validate separators
         if isinstance(prefix_sep, str):
-            prefix_sep = itertools.cycle([prefix_sep])
+            prefix_sep = [prefix_sep] * len(data_to_encode.columns)
         elif isinstance(prefix_sep, dict):
             prefix_sep = [prefix_sep[col] for col in data_to_encode.columns]
 
@@ -212,7 +211,7 @@ def check_len(item, name: str) -> None:
             with_dummies = [data.select_dtypes(exclude=dtypes_to_encode)]
 
         for col, pre, sep in zip(
-            data_to_encode.items(), prefix, prefix_sep, strict=False
+            data_to_encode.items(), prefix, prefix_sep, strict=True
         ):
             # col is (column_name, column), use just column data here
             dummy = _get_dummies_1d(