如何在python中将AWS CLI命令输出保存到var？

Question

I am trying to save AWS CLI command into python variable (list). The trick is the following code returns result I want but doesn't save it into variable and return empty list.

import os
bashCommand = 'aws s3api list-buckets --query "Buckets[].Name"'
f = [os.system(bashCommand)]

print(f)

output:

[
"bucket1",
"bucket2",
"bucket3"
]
[0]

desired output:

[
"bucket1",
"bucket2",
"bucket3"
]
("bucket1", "bucket2", "bucket3")

Answer 1

If you are using Python and you wish to list buckets, then it would be better to use the AWS SDK for Python, which is boto3 :

import boto3

s3 = boto3.resource('s3')
buckets = [bucket.name for bucket in s3.buckets.all()]

See: S3 — Boto 3 Docs

This is much more sensible that calling out to the AWS CLI (which itself uses boto!).

Answer 2

我使用此命令创建所有存储桶的 Python 列表：

bucket_list = eval(subprocess.check_output('aws s3api list-buckets --query "Buckets[].Name"').translate(None, '\r\n '))

Answer 3

You really don't need anything fancy , all you have to do is import subprocess and json and use them :)

This was tested using python3.6 and on Linux

output = subprocess.run(["aws", "--region=us-west-2", "s3api", "list-buckets", "--query", "Buckets[].Name"],  stdout=subprocess.PIPE, stderr=subprocess.PIPE)

output_utf8=output.stdout.decode('utf-8')
output_utf8_json = json.loads(output_utf8)
print(output_utf8_json)

for key in output_utf8_json:
     print(key)