code: def unpack_1tuple(tup):
      """
      If we have a length-1 tuple/list that contains a slice, unpack to just
      the slice.
  
      Notes
      -----
      The list case is deprecated.
      """
      if len(tup) == 1 and isinstance(tup[0], slice):
          # if we don't have a MultiIndex, we may still be able to handle
          #  a 1-tuple.  see test_1tuple_without_multiindex
  
          if isinstance(tup, list):
              # GH#31299
              raise ValueError(
                  "Indexing with a single-item list containing a "
                  "slice is not allowed. Pass a tuple instead.",
              )
  
          return tup[0]
      return tup
  
file_path: pandas/pandas/core/indexers/utils.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, Any
  import numpy
  from pandas._libs import lib
  from pandas.core.dtypes.common import is_array_like, is_bool_dtype, is_integer, is_integer_dtype, is_list_like
  from pandas.core.dtypes.dtypes import ExtensionDtype
  from pandas.core.dtypes.generic import ABCIndex, ABCSeries
label_desc: Use image node_id 10 for calling a global function with example usage: unpack_1tuple(tup) and returns: tup, tup