GH1053 @ for DataFrame, eval in place for DataFrame, test migrations (pandas-dev#1054)

* GH1053 @ for DataFrame, eval in place for DataFrame, test migrations

* Formatting and spelling

* GH1053 PR Feedback

* GH1053 Formatting

Author: loicdiridollou

pandas-stubs/core/frame.pyi

@@ -281,7 +281,12 @@ class DataFrame(NDFrame, OpsMixin):
     def dot(self, other: DataFrame | ArrayLike) -> DataFrame: ...
     @overload
     def dot(self, other: Series) -> Series: ...
-    def __matmul__(self, other): ...
+    @overload
+    def __matmul__(self, other: DataFrame) -> DataFrame: ...
+    @overload
+    def __matmul__(self, other: Series) -> Series: ...
+    @overload
+    def __matmul__(self, other: np.ndarray) -> DataFrame: ...
     def __rmatmul__(self, other): ...
     @overload
     @classmethod
@@ -620,7 +625,12 @@ class DataFrame(NDFrame, OpsMixin):
     def query(
         self, expr: _str, *, inplace: Literal[False] = ..., **kwargs
     ) -> DataFrame: ...
-    def eval(self, expr: _str, *, inplace: _bool = ..., **kwargs): ...
+    @overload
+    def eval(self, expr: _str, *, inplace: Literal[True], **kwargs) -> None: ...
+    @overload
+    def eval(
+        self, expr: _str, *, inplace: Literal[False] = ..., **kwargs
+    ) -> Scalar | np.ndarray | DataFrame | Series: ...
     AstypeArgExt: TypeAlias = (
         AstypeArg
         | Literal[