Method read

crates/vm/src/stdlib/_io.rs:1852–1866

(&self, size: OptionalSize, vm: &VirtualMachine)

        #[pymethod]
        fn read(&self, size: OptionalSize, vm: &VirtualMachine) -> PyResult<Option<PyBytesRef>> {
            let mut data = self.reader().lock(vm)?;
            let raw = data.check_init(vm)?;
            let n = size.size.map(|s| *s).unwrap_or(-1);
            if n < -1 {
                return Err(vm.new_value_error("read length must be non-negative or -1"));
            }
            ensure_unclosed(raw, "read of closed file", vm)?;
            match n.to_usize() {
                Some(n) => data
                    .read_generic(n, vm)
                    .map(|x| x.map(|b| PyBytes::from(b).into_ref(&vm.ctx))),
                None => data.read_all(vm),
            }
        }

        #[pymethod]
        fn peek(&self, _size: OptionalSize, vm: &VirtualMachine) -> PyResult<Vec<u8>> {