Python：如何从 S3 存储桶下载文件

Question

I have some data stored in an AWS S3 bucket.

If from terminal I do:

aws s3 ls s3://myBucket/folder/ --profile myProfile
2020-04-23 01:04:09   96858539 2020-01-01-file.csv.gz

If I try to download the file using boto3

import boto3
session = boto3.session.Session(profile_name='myProfile')
s3 = boto3.resource('s3')
f1 = '2020-01-01-file.csv.gz'
s3.meta.client.download_file('myBucket', 'folder/%s'%f1, f1)

I get the following error

ClientError: An error occurred (403) when calling the HeadObject operation: Forbidden

Answer 1

The reason why it doesn't work for you is that you create boto3 session

session = boto3.session.Session(profile_name='myProfile')

and you do not use it . So instead of boto3.resource('s3') , should try session.resource('s3')

But anyway, the boto3 docs have an entire section called Downloading Files . It shows two examples with explanation:

import boto3

s3 = boto3.client('s3')
s3.download_file('BUCKET_NAME', 'OBJECT_NAME', 'FILE_NAME')

or

s3 = boto3.client('s3')
with open('FILE_NAME', 'wb') as f:
    s3.download_fileobj('BUCKET_NAME', 'OBJECT_NAME', f)