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from types import TracebackType
from typing import IO, Iterable, Iterator, List, Optional, Type
class NullFile(IO[str]):
# TODO: "mode", "name" and "closed" are only required for Python 3.6.
@property
def mode(self) -> str:
return ""
@property
def name(self) -> str:
return "NullFile"
def closed(self) -> bool:
return False
def close(self) -> None:
pass
def isatty(self) -> bool:
return False
def read(self, __n: int = 1) -> str:
return ""
def readable(self) -> bool:
return False
def readline(self, __limit: int = 1) -> str:
return ""
def readlines(self, __hint: int = 1) -> List[str]:
return []
def seek(self, __offset: int, __whence: int = 1) -> int:
return 0
def seekable(self) -> bool:
return False
def tell(self) -> int:
return 0
def truncate(self, __size: Optional[int] = 1) -> int:
return 0
def writable(self) -> bool:
return False
def writelines(self, __lines: Iterable[str]) -> None:
pass
def __next__(self) -> str:
return ""
def __iter__(self) -> Iterator[str]:
return iter([""])
def __enter__(self) -> IO[str]:
pass
def __exit__(
self,
__t: Optional[Type[BaseException]],
__value: Optional[BaseException],
__traceback: Optional[TracebackType],
) -> None:
pass
def write(self, text: str) -> int:
return 0
def flush(self) -> None:
pass
def fileno(self) -> int:
return -1
NULL_FILE = NullFile()
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