Method init

crates/vm/src/stdlib/_io.rs:1603–1648

(
            &self,
            raw: PyObjectRef,
            BufferSize { buffer_size }: BufferSize,
            vm: &VirtualMachine,
        )

        }

        fn init(
            &self,
            raw: PyObjectRef,
            BufferSize { buffer_size }: BufferSize,
            vm: &VirtualMachine,
        ) -> PyResult<()> {
            let mut data = self.lock(vm)?;
            data.raw = None;
            data.flags.remove(BufferedFlags::DETACHED);

            let buffer_size = match buffer_size {
                OptionalArg::Present(i) if i <= 0 => {
                    return Err(vm.new_value_error("buffer size must be strictly positive"));
                }
                OptionalArg::Present(i) => i as usize,
                OptionalArg::Missing => DEFAULT_BUFFER_SIZE,
            };

            if Self::SEEKABLE {
                check_seekable(&raw, vm)?;
            }
            if Self::READABLE {
                data.flags.insert(BufferedFlags::READABLE);
                check_readable(&raw, vm)?;
            }
            if Self::WRITABLE {
                data.flags.insert(BufferedFlags::WRITABLE);
                check_writable(&raw, vm)?;
            }

            data.buffer = vec![0; buffer_size];

            if Self::READABLE {
                data.reset_read();
            }
            if Self::WRITABLE {
                data.reset_write();
            }
            if Self::SEEKABLE {
                data.pos = 0;
            }

            data.raw = Some(raw);

            Ok(())
        }

        #[pymethod]
        fn seek(