add more functions/overloads to stubs

stubs/numpy/numpy_core.pyi

@@ -107,7 +107,17 @@ class ndarray(List):
     @overload
     def any(self, axis: int, **kwargs) -> ndarray: ...
 
-    def astype(self, ty, **kwargs) -> 'ndarray': ...
+    @overload
+    def astype(self, ty: Literal[str], **kwargs) -> 'ndarray[str]': ...
+
+    @overload
+    def astype(self, ty: Literal[int], **kwargs) -> 'ndarray[int]': ...
+
+    @overload
+    def astype(self, ty: Literal[float], **kwargs) -> 'ndarray[float]': ...
+
+    @overload
+    def astype(self, ty: Literal[bool], **kwargs) -> 'ndarray[bool]': ...
 
     def reshape(self, shape: Tuple, **kwargs) -> 'ndarray': ...
 
@@ -199,3 +209,6 @@ def outer(*args, **kwargs) -> ndarray: ...
 
 
 def size(*args, **kwargs) -> ndarray: ...
+
+
+def where(*args, **kwargs) -> ndarray: ...

stubs/pandas/pandas_core.pyi

@@ -221,15 +221,11 @@ class DataFrame:
 
     def apply(self, x: Callable, **kwargs) -> 'DataFrame': ...
 
+    @classmethod
+    def from_records(self, records: List[dict], **kwargs) -> 'DataFrame': ...
 
-class Series:
-
-    # These are custom values
-    node_id: 'Series'
-    parent_id: 'Series'
-    relation: 'Series'
 
-    T: 'DataFrame'
+class Series:
 
     loc: 'SeriesLoc'
     at: 'At'
@@ -251,7 +247,7 @@ class Series:
                  copy: bool = ...,
                  ): ...
 
-    def __getitem__(self, idx) -> ndarray: ...
+    def __getitem__(self, idx) -> Any: ...
 
     def __setitem__(self, idx, value) -> None: ...