如何检查特定文件是否存在于 s3 存储桶中

Question

I am new to AWS and I want to check if a particular csv exists in a folder in s3. And if it does i want to read it and if it doesn't i want to create a df and upload it to s3.

what i did till now

list_of_files = []
    for key in s3_client.list_objects(Bucket= 'abc',Prefix="folder/")['Contents']:
        list_of_files.append(key['Key'])

check_files = [list of file to check]

something like

if set(check_files) in set(list_of_files):
   read_from_s3(file)
else:
  pd.Dataframe()

Answer 1

Use the s3_client get_object. https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.get_object

If the object doesn't exists it will throw exception S3.Client.exceptions.NoSuchKey

Check below sample

        try:
            s3_client.get_object(
                Bucket=self._bucket,
                Key=key,
            )
            return True
        except s3_client.exceptions.NoSuchKey:
            return False