我尝试并尽可能简单地加以解释。 因此,无法保证实际术语的准确性。
<>Session 系指与AWS服务建立联系的地点。 例如,以下是采用缺省成像特征的缺席会议(例如:~/.aws/credentials,或根据IAM案例简介假设EC2)。
sqs = boto3.client( sqs )
s3 = boto3.resource( s3 )
由于缺席会议仅限于所采用的简介或案例简介,有时你需要利用习俗会议来推翻缺席会议组合(例如,区域——名称、终点——等等)。 e.g.
# custom resource session must use boto3.Session to do the override
my_west_session = boto3.Session(region_name = us-west-2 )
my_east_session = boto3.Session(region_name = us-east-1 )
backup_s3 = my_west_session.resource( s3 )
video_s3 = my_east_session.resource( s3 )
# you have two choices of create custom client session.
backup_s3c = my_west_session.client( s3 )
video_s3c = boto3.client("s3", region_name = us-east-1 )
Resource : This is the high-level service class recommended to be used. This allows you to tied particular AWS resources and passes it along, so you just use this abstraction than worry which target services are pointed to. As you notice from the session part, if you have a custom session, you just pass this abstract object than worrying about all custom regions,etc to pass along. Following is a complicated example
E.g.
import boto3
my_west_session = boto3.Session(region_name = us-west-2 )
my_east_session = boto3.Session(region_name = us-east-1 )
backup_s3 = my_west_session.resource("s3")
video_s3 = my_east_session.resource("s3")
backup_bucket = backup_s3.Bucket( backupbucket )
video_bucket = video_s3.Bucket( videobucket )
# just pass the instantiated bucket object
def list_bucket_contents(bucket):
for object in bucket.objects.all():
print(object.key)
list_bucket_contents(backup_bucket)
list_bucket_contents(video_bucket)
<Client 是低级物体。 对于每个客户的要求,你需要明确指明目标资源,指定服务对象的名字必须很长。 你们将失去抽象的能力。
例如,如果你只处理拖欠会议,则与资源相似。
import boto3
s3 = boto3.client( s3 )
def list_bucket_contents(bucket_name):
for object in s3.list_objects_v2(Bucket=bucket_name) :
print(object.key)
list_bucket_contents( Mybucket )
然而,如果你想要从不同区域的桶子中排出物体,那么你需要具体说明客户所需的明确桶价。
import boto3
backup_s3 = my_west_session.client( s3 ,region_name = us-west-2 )
video_s3 = my_east_session.client( s3 ,region_name = us-east-1 )
# you must pass boto3.Session.client and the bucket name
def list_bucket_contents(s3session, bucket_name):
response = s3session.list_objects_v2(Bucket=bucket_name)
if Contents in response:
for obj in response[ Contents ]:
print(obj[ key ])
list_bucket_contents(backup_s3, backupbucket )
list_bucket_contents(video_s3 , videobucket )
