以下是一个使用AWS SDK for Python（Boto3）的示例代码，演示如何在AWS控制台和请求上下文中执行操作：

1. 安装Boto3库

   pip install boto3
   

2. 创建一个Python脚本，并导入所需的模块：

   import boto3
   import logging
   import os
   import urllib.request
   from botocore.exceptions import ClientError
   

3. 配置日志记录：

   logging.basicConfig(level=logging.INFO,
                       format='%(levelname)s: %(asctime)s: %(message)s')
   

4. 创建AWS控制台和请求上下文：

   def create_presigned_url(bucket_name, object_name, expiration=3600):
       """Generate a presigned URL to share an S3 object
   
       :param bucket_name: string
       :param object_name: string
       :param expiration: Time in seconds for the presigned URL to remain valid
       :return: Presigned URL as string. If error, returns None.
       """
   
       # Generate a presigned URL for the S3 object
       s3_client = boto3.client('s3')
       try:
           response = s3_client.generate_presigned_url('get_object',
                                                       Params={'Bucket': bucket_name,
                                                               'Key': object_name},
                                                       ExpiresIn=expiration)
       except ClientError as e:
           logging.error(e)
           return None
   
       # The response contains the presigned URL
       return response
   

5. 使用AWS控制台和请求上下文执行操作：

   def main():
       # Set the AWS region and credentials
       os.environ['AWS_DEFAULT_REGION'] = 'us-west-2'
       os.environ['AWS_ACCESS_KEY_ID'] = 'your_access_key_id'
       os.environ['AWS_SECRET_ACCESS_KEY'] = 'your_secret_access_key'
   
       # Specify the S3 bucket and object name
       bucket_name = 'your_bucket_name'
       object_name = 'your_object_name'
   
       # Generate a presigned URL
       presigned_url = create_presigned_url(bucket_name, object_name)
       if presigned_url is None:
           exit(1)
   
       # Use the presigned URL to download the S3 object
       try:
           with urllib.request.urlopen(presigned_url) as response:
               logging.info('Downloading object from S3')
               data = response.read()
               logging.info('Downloaded object: %s', data)
       except urllib.error.URLError as e:
           logging.error(e)
           exit(1)
   
   if __name__ == '__main__':
       main()
   

请注意，上述代码中的参数（例如AWS访问密钥和区域）需要根据您自己的AWS配置进行修改。此外，您还需要将your_bucket_name和your_object_name替换为您自己的S3存储桶名称和对象名称。

这个示例演示了如何使用AWS SDK for Python（Boto3）生成S3对象的预签名URL，并使用该URL下载对象。