from typing import Union, Any, Optional, IO Buffer = Union[bytes, bytearray, memoryview] import sys def b(s: str) -> bytes: ... def bchr(s: int) -> bytes: ... def bord(s: bytes) -> int: ... def tobytes(s: Union[bytes, str]) -> bytes: ... def tostr(b: bytes) -> str: ... def bytestring(x: Any) -> bool: ... def is_native_int(s: Any) -> bool: ... def is_string(x: Any) -> bool: ... def is_bytes(x: Any) -> bool: ... def BytesIO(b: bytes) -> IO[bytes]: ... def StringIO(s: str) -> IO[str]: ... if sys.version_info[0] == 2: from sys import maxint iter_range = xrange else: from sys import maxsize as maxint iter_range = range class FileNotFoundError: def __init__(self, err: int, msg: str, filename: str) -> None: pass def _copy_bytes(start: Optional[int], end: Optional[int], seq: Buffer) -> bytes: ...