CLN: revert unrelated allow_duplicates and cols_droplevel changes

Author: tinezivic

pandas/core/frame.py

@@ -4703,14 +4703,11 @@ def _set_item_frame_value(self, key, value: DataFrame) -> None:
                 if (
                     not isinstance(cols_droplevel, MultiIndex)
                     and is_string_dtype(cols_droplevel.dtype)
-                    and (cols_droplevel == "").all()
+                    and not cols_droplevel.any()
                 ):
                     # if cols_droplevel contains only empty strings,
                     # value.reindex(cols_droplevel, axis=1) would be full of NaNs
                     # see GH#62518 and GH#61841
-                    # Note: use (== "").all() rather than not .any() to avoid
-                    # triggering on falsy-but-non-empty values such as integer 0
-                    # (GH#65118).
                     return
                 if len(cols_droplevel) and not cols_droplevel.equals(value.columns):
                     value = value.reindex(cols_droplevel, axis=1)
@@ -5496,7 +5493,7 @@ def insert(
         loc: int,
         column: Hashable,
         value: object,
-        allow_duplicates: bool | lib.NoDefault = lib.no_default,
+        allow_duplicates: bool = False,
     ) -> None:
         """
         Insert column into DataFrame at specified location.
@@ -5512,7 +5509,7 @@ def insert(
             Label of the inserted column.
         value : Scalar, Series, or array-like
             Content of the inserted column.
-        allow_duplicates : bool, optional, default lib.no_default
+        allow_duplicates : bool, default False
             Allow duplicate column labels to be created.
 
         See Also
@@ -5545,8 +5542,6 @@ def insert(
         0   NaN   100     1      99     3
         1   5.0   100     2      99     4
         """
-        if allow_duplicates is lib.no_default:
-            allow_duplicates = False
         if allow_duplicates and not self.flags.allows_duplicate_labels:
             raise ValueError(
                 "Cannot specify 'allow_duplicates=True' when "
@@ -6988,7 +6983,7 @@ def reset_index(
         inplace: Literal[False] = ...,
         col_level: Hashable = ...,
         col_fill: Hashable = ...,
-        allow_duplicates: bool | lib.NoDefault = ...,
+        allow_duplicates: bool = ...,
         names: Hashable | Sequence[Hashable] | None = None,
     ) -> DataFrame: ...
 
@@ -7001,7 +6996,7 @@ def reset_index(
         inplace: Literal[True],
         col_level: Hashable = ...,
         col_fill: Hashable = ...,
-        allow_duplicates: bool | lib.NoDefault = ...,
+        allow_duplicates: bool = ...,
         names: Hashable | Sequence[Hashable] | None = None,
     ) -> None: ...
 
@@ -7014,7 +7009,7 @@ def reset_index(
         inplace: bool = ...,
         col_level: Hashable = ...,
         col_fill: Hashable = ...,
-        allow_duplicates: bool | lib.NoDefault = ...,
+        allow_duplicates: bool = ...,
         names: Hashable | Sequence[Hashable] | None = None,
     ) -> DataFrame | None: ...
 
@@ -7026,7 +7021,7 @@ def reset_index(
         inplace: bool = False,
         col_level: Hashable = 0,
         col_fill: Hashable = "",
-        allow_duplicates: bool | lib.NoDefault = lib.no_default,
+        allow_duplicates: bool = False,
         names: Hashable | Sequence[Hashable] | None = None,
     ) -> DataFrame | None:
         """
@@ -7053,7 +7048,7 @@ def reset_index(
         col_fill : object, default ''
             If the columns have multiple levels, determines how the other
             levels are named. If None then the index name is repeated.
-        allow_duplicates : bool, optional, default lib.no_default
+        allow_duplicates : bool, default False
             Allow duplicate column labels to be created.
         names : int, str or 1-dimensional list, default None
             Using the given string, rename the DataFrame column which contains the
@@ -7193,8 +7188,7 @@ class    max    type
             new_obj = self
         else:
             new_obj = self.copy(deep=False)
-        if allow_duplicates is not lib.no_default:
-            allow_duplicates = validate_bool_kwarg(allow_duplicates, "allow_duplicates")
+        allow_duplicates = validate_bool_kwarg(allow_duplicates, "allow_duplicates")
 
         new_index = default_index(len(new_obj))
         if level is not None: