gh-483: Changed the return type to dict in to_dict (#518)

* Changed the return type to dict

* updated the dict argument

* Corrections changed the Series.to_dict

Author: ramvikrams

pandas-stubs/core/series.pyi

@@ -474,7 +474,7 @@ class Series(IndexOpsMixin, NDFrame, Generic[S1]):
     def items(self) -> Iterable[tuple[Hashable, S1]]: ...
     def keys(self) -> list: ...
     @overload
-    def to_dict(self) -> dict[Hashable, S1]: ...
+    def to_dict(self) -> dict[Any, S1]: ...
     @overload
     def to_dict(self, into: type[Mapping] | Mapping) -> Mapping[Hashable, S1]: ...
     def to_frame(self, name: object | None = ...) -> DataFrame: ...

tests/test_series.py

@@ -8,7 +8,6 @@
     Any,
     Dict,
     Generic,
-    Hashable,
     Iterable,
     Iterator,
     List,
@@ -997,7 +996,7 @@ def test_types_to_list() -> None:
 
 def test_types_to_dict() -> None:
     s = pd.Series(["a", "b", "c"], dtype=str)
-    assert_type(s.to_dict(), Dict[Hashable, str])
+    assert_type(s.to_dict(), Dict[Any, str])
 
 
 def test_categorical_codes():
@@ -1377,3 +1376,11 @@ def func() -> MySeries[float]:
         return MySeries[float]([1, 2, 3])
 
     func()
+
+
+def test_change_to_dict_return_type() -> None:
+    id = [1, 2, 3]
+    value = ["a", "b", "c"]
+    df = pd.DataFrame(zip(id, value), columns=["id", "value"])
+    fd = df.set_index("id")["value"].to_dict()
+    check(assert_type(fd, Dict[Any, Any]), dict)