bz2 stub exceptions (#5199)

stdlib/bz2.pyi

@@ -1,8 +1,8 @@
 import io
 import sys
-from _typeshed import AnyPath
-from typing import IO, Any, Optional, TextIO, TypeVar, Union, overload
-from typing_extensions import Literal
+from _typeshed import AnyPath, ReadableBuffer, WriteableBuffer
+from typing import IO, Any, Iterable, List, Optional, TextIO, TypeVar, Union, overload
+from typing_extensions import Literal, SupportsIndex
 
 _PathOrFile = Union[AnyPath, IO[bytes]]
 _T = TypeVar("_T")
@@ -49,10 +49,18 @@ class BZ2File(io.BufferedIOBase, IO[bytes]):
         def __init__(
             self, filename: _PathOrFile, mode: str = ..., buffering: Optional[Any] = ..., compresslevel: int = ...
         ) -> None: ...
+    def read(self, size: Optional[int] = ...) -> bytes: ...
+    def read1(self, size: int = ...) -> bytes: ...
+    def readline(self, size: SupportsIndex = ...) -> bytes: ...  # type: ignore
+    def readinto(self, b: WriteableBuffer) -> int: ...
+    def readlines(self, size: SupportsIndex = ...) -> List[bytes]: ...
+    def seek(self, offset: int, whence: int = ...) -> int: ...
+    def write(self, data: ReadableBuffer) -> int: ...
+    def writelines(self, seq: Iterable[ReadableBuffer]) -> None: ...
 
 class BZ2Compressor(object):
     def __init__(self, compresslevel: int = ...) -> None: ...
-    def compress(self, data: bytes) -> bytes: ...
+    def compress(self, __data: bytes) -> bytes: ...
     def flush(self) -> bytes: ...
 
 class BZ2Decompressor(object):