modal.file_io

modal.file_io.FileIO

class FileIO(typing.Generic)

FileIO handle, used in the Sandbox filesystem API.

The API is designed to mimic Python’s io.FileIO.

Usage

import modal

app = modal.App.lookup("my-app", create_if_missing=True)

sb = modal.Sandbox.create(app=app)
f = sb.open("/tmp/foo.txt", "w")
f.write("hello")
f.close()

create

@classmethod
def create(
    cls, path: str, mode: Union["_typeshed.OpenTextMode", "_typeshed.OpenBinaryMode"], client: _Client, task_id: str
) -> "_FileIO":

Create a new FileIO handle.

read

def read(self, n: Optional[int] = None) -> T:

Read n bytes from the current position, or the entire remaining file if n is None.

readline

def readline(self) -> T:

Read a single line from the current position.

readlines

def readlines(self) -> Sequence[T]:

Read all lines from the current position.

write

def write(self, data: Union[bytes, str]) -> None:

Write data to the current position.

Writes may not appear until the entire buffer is flushed, which can be done manually with flush() or automatically when the file is closed.

flush

def flush(self) -> None:

Flush the buffer to disk.

seek

def seek(self, offset: int, whence: int = 0) -> None:

Move to a new position in the file.

whence defaults to 0 (absolute file positioning); other values are 1 (relative to the current position) and 2 (relative to the file’s end).

ls

@classmethod
def ls(cls, path: str, client: _Client, task_id: str) -> list[str]:

List the contents of the provided directory.

mkdir

@classmethod
def mkdir(cls, path: str, client: _Client, task_id: str, parents: bool = False) -> None:

Create a new directory.

rm

@classmethod
def rm(cls, path: str, client: _Client, task_id: str, recursive: bool = False) -> None:

Remove a file or directory in the Sandbox.

close

def close(self) -> None:

Flush the buffer and close the file.

modal.file_io.delete_bytes

async def delete_bytes(file: "_FileIO", start: Optional[int] = None, end: Optional[int] = None) -> None:

Delete a range of bytes from the file.

start and end are byte offsets. start is inclusive, end is exclusive. If either is None, the start or end of the file is used, respectively.

modal.file_io.replace_bytes

async def replace_bytes(file: "_FileIO", data: bytes, start: Optional[int] = None, end: Optional[int] = None) -> None:

Replace a range of bytes in the file with new data. The length of the data does not have to be the same as the length of the range being replaced.

start and end are byte offsets. start is inclusive, end is exclusive. If either is None, the start or end of the file is used, respectively.