Rename _nested_seq.py to _nested_iter.py

skbase/base/_meta.py

@@ -10,7 +10,7 @@
 from typing import List
 
 from skbase.base._base import BaseEstimator
-from skbase.utils._nested_seq import flatten, is_flat, unflatten
+from skbase.utils._nested_iter import flatten, is_flat, unflatten
 
 __author__: List[str] = ["mloning", "fkiraly"]
 __all__: List[str] = ["BaseMetaEstimator"]

skbase/testing/utils/_conditional_fixtures.py

@@ -7,7 +7,7 @@
 from typing import Callable, Dict, List
 
 from skbase._exceptions import FixtureGenerationError
-from skbase.utils._misc import _remove_single
+from skbase.utils._nested_iter import _remove_single
 from skbase.validate._types import _check_list_of_str
 
 __author__: List[str] = ["fkiraly"]

skbase/utils/__init__.py

@@ -4,7 +4,7 @@
 """Functionality used through `skbase`."""
 from typing import List
 
-from skbase.utils._nested_seq import flatten, is_flat, unflat_len, unflatten
+from skbase.utils._nested_iter import flatten, is_flat, unflat_len, unflatten
 
 __author__: List[str] = ["RNKuhns", "fkiraly"]
 __all__: List[str] = ["flatten", "is_flat", "unflat_len", "unflatten"]

skbase/utils/_nested_seq.py → skbase/utils/_nested_iter.py

@@ -8,6 +8,23 @@
 __all__: List[str] = ["flatten", "is_flat", "unflat_len", "unflatten"]
 
 
+def _remove_single(x):
+    """Remove tuple wrapping from singleton.
+
+    Parameters
+    ----------
+    x : tuple
+
+    Returns
+    -------
+    x[0] if x is a singleton, otherwise x
+    """
+    if len(x) == 1:
+        return x[0]
+    else:
+        return x
+
+
 def flatten(obj):
     """Flatten nested list/tuple structure.