Download S3 Objects With Python and Boto 3

s3 python download file

Let's build a Flask application that allows users to upload and download files to and from our S3 buckets, as hosted on AWS. We will use the Boto3 SDK to facilitate. Comprehensive Guide to Download Files From S3 with Python. By: Mydatahack print('Downloaded File with boto3 resource') bucket_name. s3 = boto3.resource('s3') view raw aws-example-s3-boto-download.py hosted with ❤ by GitHub.

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Python S3 Examples¶

Creating a Connection¶

This creates a connection so that you can interact with the server.

importbotoimportboto.s3.connectionaccess_key='put your access key here!'secret_key='put your secret key here!'conn=boto.connect_s3(aws_access_key_id=access_key,aws_secret_access_key=secret_key,host='objects.dreamhost.com',#is_secure=False, # uncomment if you are not using sslcalling_format=boto.s3.connection.OrdinaryCallingFormat(),)

Listing Owned Buckets¶

This gets a list of Buckets that you own. This also prints out the bucket name and creation date of each bucket.

forbucketinconn.get_all_buckets():print"{name}\t{created}".format(name=bucket.name,created=bucket.creation_date,)

The output will look something like this:

mahbuckat12011-04-21T18:05:39.000Zmahbuckat22011-04-21T18:05:48.000Zmahbuckat32011-04-21T18:07:18.000Z

Creating a Bucket¶

This creates a new bucket called

bucket=conn.create_bucket('my-new-bucket')

Listing a Bucket’s Content¶

This gets a list of objects in the bucket. This also prints out each object’s name, the file size, and last modified date.

forkeyinbucket.list():print"{name}\t{size}\t{modified}".format(name=key.name,size=key.size,modified=key.last_modified,)

The output will look something like this:

myphoto1.jpg2512622011-08-08T21:35:48.000Zmyphoto2.jpg2625182011-08-08T21:38:01.000Z

Deleting a Bucket¶

Note

The Bucket must be empty! Otherwise it won’t work!

conn.delete_bucket(bucket.name)

Forced Delete for Non-empty Buckets¶

Attention

not available in python

Creating an Object¶

This creates a file with the string

key=bucket.new_key('hello.txt')key.set_contents_from_string('Hello World!')

Change an Object’s ACL¶

This makes the object to be publicly readable, and to be private.

hello_key=bucket.get_key('hello.txt')hello_key.set_canned_acl('public-read')plans_key=bucket.get_key('secret_plans.txt')plans_key.set_canned_acl('private')

Download an Object (to a file)¶

This downloads the object and saves it in

key=bucket.get_key('perl_poetry.pdf')key.get_contents_to_filename('/home/larry/documents/perl_poetry.pdf')

Delete an Object¶

This deletes the object

bucket.delete_key('goodbye.txt')

Generate Object Download URLs (signed and unsigned)¶

This generates an unsigned download URL for . This works because we made public by setting the ACL above. This then generates a signed download URL for that will work for 1 hour. Signed download URLs will work for the time period even if the object is private (when the time period is up, the URL will stop working).

hello_key=bucket.get_key('hello.txt')hello_url=hello_key.generate_url(0,query_auth=False,force_http=True)printhello_urlplans_key=bucket.get_key('secret_plans.txt')plans_url=plans_key.generate_url(3600,query_auth=True,force_http=True)printplans_url

The output of this will look something like:

http://objects.dreamhost.com/my-bucket-name/hello.txt http://objects.dreamhost.com/my-bucket-name/secret_plans.txt?Signature=XXXXXXXXXXXXXXXXXXXXXXXXXXX&Expires=1316027075&AWSAccessKeyId=XXXXXXXXXXXXXXXXXXX

Using S3 API Extensions¶

To use the boto3 client to tests the RadosGW extensions to the S3 API, the extensions file should be placed under: directory. For example, unordered list of objects could be fetched using:

printconn.list_objects(Bucket='my-new-bucket',AllowUnordered=True)

Without the extensions file, in the above example, boto3 would complain that the argument is invalid.

Источник: [https://torrent-igruha.org/3551-portal.html]

S3 python download file