AWS S3 - Python读取，处理，然后写入

Question

我希望在Python中使用boto3甚至类似smart_open的东西来逐行读取文件，然后处理每一行（例如清理某些字段），然后将这些行写回S3。关键是内存中没有任何数据。有什么建议？我尝试过使用以下内容但没有成功

into = "s3://"+access_key+":"+secret_key+"@"+bucket+"/Filetoread.csv"
out = "s3://"+access_key+":"+secret_key+"@"+bucket+"/Filetowrite.csv"

def streamline(inputfile, outputfile):
with smart_open.smart_open(inputfile, 'r') as infile, smart_open.smart_open(outputfile, 'w') as outfile:
    for line in infile:
        outfile.write(line + '\n')

streamline(into, out)