Revert "Update base.py"

This reverts commit 090bd79.

Author: yqyqyq-W

pandas/core/base.py

@@ -20,6 +20,7 @@
 
 import numpy as np
 
+import pandas as pd
 from pandas._libs import lib
 from pandas._typing import (
     Axis,
@@ -55,7 +56,6 @@
     remove_na_arraylike,
 )
 
-from pandas.core.frame import DataFrame
 from pandas.core import (
     algorithms,
     nanops,
@@ -1271,7 +1271,7 @@ def searchsorted(
         sorter: NumpySorter = None,
     ) -> npt.NDArray[np.intp] | np.intp:
 
-        if isinstance(value, DataFrame):
+        if isinstance(value, pd.DataFrame):
             msg = (
                 "Value must be array-like or scalar, "
                 f"{type(value).__name__} is not supported"