apply black and isort (#4287)

* apply black and isort

* move some type ignores

stdlib/3/dbm/__init__.pyi

@@ -1,6 +1,6 @@
 import sys
 from types import TracebackType
-from typing import Iterator, Optional, Type, Union, MutableMapping
+from typing import Iterator, MutableMapping, Optional, Type, Union
 
 from typing_extensions import Literal
 
@@ -16,10 +16,11 @@ class _Database(MutableMapping[_KeyType, bytes]):
     def __len__(self) -> int: ...
     def __del__(self) -> None: ...
     def __enter__(self) -> _Database: ...
-    def __exit__(self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]) -> None: ...
+    def __exit__(
+        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
+    ) -> None: ...
 
 class error(Exception): ...
 
 def whichdb(filename: str) -> str: ...
-
-def open(file: str, flag: Literal['r', 'w', 'c', 'n'] = ..., mode: int = ...) -> _Database: ...
+def open(file: str, flag: Literal["r", "w", "c", "n"] = ..., mode: int = ...) -> _Database: ...

stdlib/3/dbm/dumb.pyi

@@ -1,7 +1,6 @@
-
 import sys
-from typing import Union, MutableMapping, Iterator, Optional, Type
 from types import TracebackType
+from typing import Iterator, MutableMapping, Optional, Type, Union
 
 if sys.version_info >= (3, 8):
     from typing import Final
@@ -14,7 +13,6 @@ _ValueType = Union[str, bytes]
 error = OSError
 
 class _Database(MutableMapping[_KeyType, bytes]):
-
     def __init__(self, filebasename: str, mode: str, flag: str = ...) -> None: ...
     def sync(self) -> None: ...
     def iterkeys(self) -> Iterator[bytes]: ...  # undocumented
@@ -26,6 +24,8 @@ class _Database(MutableMapping[_KeyType, bytes]):
     def __len__(self) -> int: ...
     def __del__(self) -> None: ...
     def __enter__(self) -> _Database: ...
-    def __exit__(self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]) -> None: ...
+    def __exit__(
+        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
+    ) -> None: ...
 
 def open(file: str, flag: str = ..., mode: int = ...) -> _Database: ...

stdlib/3/dbm/gnu.pyi

@@ -1,8 +1,7 @@
-
-from typing import Union, Optional, Type, Iterator, overload, List, TypeVar, Generic
 from types import TracebackType
+from typing import Generic, Iterator, List, Optional, Type, TypeVar, Union, overload
 
-_T = TypeVar('_T')
+_T = TypeVar("_T")
 _KeyType = Union[str, bytes]
 _ValueType = Union[str, bytes]
 
@@ -20,15 +19,15 @@ class _gdbm:
     def __delitem__(self, key: _KeyType) -> None: ...
     def __len__(self) -> int: ...
     def __enter__(self) -> _gdbm: ...
-    def __exit__(self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]) -> None: ...
-
+    def __exit__(
+        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
+    ) -> None: ...
     @overload
     def get(self, k: _KeyType) -> Optional[bytes]: ...
     @overload
     def get(self, k: _KeyType, default: Union[bytes, _T]) -> Union[bytes, _T]: ...
     def keys(self) -> List[bytes]: ...
     def setdefault(self, k: _KeyType, default: _ValueType = ...) -> bytes: ...
-
     # Don't exist at runtime
     __new__: None  # type: ignore
     __init__: None  # type: ignore

stdlib/3/dbm/ndbm.pyi

@@ -1,8 +1,7 @@
-
-from typing import Generic, Union, Iterator, Optional, Type, TypeVar, overload, List
 from types import TracebackType
+from typing import Generic, Iterator, List, Optional, Type, TypeVar, Union, overload
 
-_T = TypeVar('_T')
+_T = TypeVar("_T")
 _KeyType = Union[str, bytes]
 _ValueType = Union[str, bytes]
 
@@ -12,7 +11,6 @@ library: str = ...
 
 # Actual typename dbm, not exposed by the implementation
 class _dbm:
-
     def close(self) -> None: ...
     def __getitem__(self, item: _KeyType) -> bytes: ...
     def __setitem__(self, key: _KeyType, value: _ValueType) -> None: ...
@@ -20,15 +18,15 @@ class _dbm:
     def __len__(self) -> int: ...
     def __del__(self) -> None: ...
     def __enter__(self) -> _dbm: ...
-    def __exit__(self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]) -> None: ...
-
+    def __exit__(
+        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
+    ) -> None: ...
     @overload
     def get(self, k: _KeyType) -> Optional[bytes]: ...
     @overload
     def get(self, k: _KeyType, default: Union[bytes, _T]) -> Union[bytes, _T]: ...
     def keys(self) -> List[bytes]: ...
     def setdefault(self, k: _KeyType, default: _ValueType = ...) -> bytes: ...
-
     # Don't exist at runtime
     __new__: None  # type: ignore
     __init__: None  # type: ignore