Python AWS Boto3:如何从S3存储桶读取文件? [英] Python AWS Boto3: How to read files from S3 bucket?

问题描述

使用Boto3，python脚本从S3存储桶下载文件以读取它们，并将下载文件的内容写入名为blank_file.txt的文件.

Using Boto3, the python script downloads files from an S3 bucket to read them and write the contents of the downloaded files to a file called blank_file.txt.

我的问题是，一旦脚本进入AWS Lambda函数，它将如何以相同的方式工作?

My question is, how would it work the same way once the script gets on an AWS Lambda function?

推荐答案

Lambda提供512 MB的 /tmp 空间.您可以使用该挂载点来存储下载的S3文件或创建新文件.

Lambda provides 512 MB of /tmp space. You can use that mount point to store the downloaded S3 files or to create new ones.

s3client.download_file(bucket_name, obj.key, '/tmp/'+filename)
...
blank_file = open('/tmp/blank_file.txt', 'w')

Lambda使用的工作目录是/var/task，它是一个只读文件系统.您将无法在其中创建文件.

The working directory used by Lambda is /var/task and it is a read-only filesystem. You will not be able to create files in it.

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