change type of curvefit's p0 and bounds to mapping (#8502)

* change type of curvefit's p0 and bounds to mapping

* add entry to whats-new

Author: headtr1ck

doc/whats-new.rst

@@ -58,7 +58,9 @@ Bug fixes
 - Fix dtype inference for ``pd.CategoricalIndex`` when categories are backed by a ``pd.ExtensionDtype`` (:pull:`8481`)
 - Fix writing a variable that requires transposing when not writing to a region (:pull:`8484`)
   By `Maximilian Roos <https://github.com/max-sixty>`_.
-
+- Static typing of ``p0`` and ``bounds`` arguments of :py:func:`xarray.DataArray.curvefit` and :py:func:`xarray.Dataset.curvefit`
+  was changed to ``Mapping`` (:pull:`8502`).
+  By `Michael Niklas <https://github.com/headtr1ck>`_.
 
 Documentation
 ~~~~~~~~~~~~~

xarray/core/dataarray.py

@@ -6220,8 +6220,8 @@ def curvefit(
         func: Callable[..., Any],
         reduce_dims: Dims = None,
         skipna: bool = True,
-        p0: dict[str, float | DataArray] | None = None,
-        bounds: dict[str, tuple[float | DataArray, float | DataArray]] | None = None,
+        p0: Mapping[str, float | DataArray] | None = None,
+        bounds: Mapping[str, tuple[float | DataArray, float | DataArray]] | None = None,
         param_names: Sequence[str] | None = None,
         errors: ErrorOptions = "raise",
         kwargs: dict[str, Any] | None = None,

xarray/core/dataset.py

@@ -9622,8 +9622,8 @@ def curvefit(
         func: Callable[..., Any],
         reduce_dims: Dims = None,
         skipna: bool = True,
-        p0: dict[str, float | DataArray] | None = None,
-        bounds: dict[str, tuple[float | DataArray, float | DataArray]] | None = None,
+        p0: Mapping[str, float | DataArray] | None = None,
+        bounds: Mapping[str, tuple[float | DataArray, float | DataArray]] | None = None,
         param_names: Sequence[str] | None = None,
         errors: ErrorOptions = "raise",
         kwargs: dict[str, Any] | None = None,