如何将流的内容放入val中？

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class StreamToValExample {
    public static void main(String[] args) {
        InputStream inputStream = // 创建输入流对象，例如从文件或网络中获取流
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        try {
            byte[] buffer = new byte[1024];
            int length;
            while ((length = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, length);
            }
            byte[] val = outputStream.toByteArray();
            // 使用val变量进行后续操作
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                inputStream.close();
                outputStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

import io

def stream_to_val(stream):
    val = stream.read()
    # 使用val变量进行后续操作
    return val

# 创建流对象，例如从文件或网络中获取流
stream = io.BytesIO(b"Hello, World!")

val = stream_to_val(stream)