Object Storage Service:Append upload (OSS SDK for Python 1.0)

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider

# Obtain access credentials from environment variables. Before you run the code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Specify the ID of the region that maps to the endpoint. Example: cn-hangzhou. This parameter is required if you use the signature algorithm V4.
region = "cn-hangzhou"

# Specify the name of your bucket.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

# The following code provides an example on how to specify headers for the append upload: 
# headers = dict()
# Specify the caching behavior of the web page for the object. 
# headers['Cache-Control'] = 'no-cache'
# Specify the name of the object when the object is downloaded. 
# headers['Content-Disposition'] = 'oss_MultipartUpload.txt'
# Specify the request header that is used to check whether the content of the received message is the same as the content of the sent message. 
# headers['Content-MD5'] = 'ohhnqLBJFiKkPSBO1eNaUA=='
# Specify the expiration time. 
# headers['Expires'] = 'Wed, 08 Jul 2022 16:57:01 GMT'
# Specify the access control list (ACL) of the object. In this example, the ACL is set to OBJECT_ACL_PRIVATE. 
# headers['x-oss-object-acl'] = oss2.OBJECT_ACL_PRIVATE
# Specify whether to overwrite the object with the same name in the append upload. 
# headers['x-oss-forbid-overwrite'] = 'true'
# Specify the server-side encryption method. In this example, SSE-OSS is specified for server-side encryption. 
# headers[OSS_SERVER_SIDE_ENCRYPTION] = SERVER_SIDE_ENCRYPTION_AES256
# Specify the storage class of the object. 
# headers['x-oss-storage-class'] = oss2.BUCKET_STORAGE_CLASS_STANDARD
# You can add parameters whose names are prefixed with x-oss-meta- when you call the AppendObject operation to create an appendable object. These parameters cannot be included in the requests when you append content to an existing appendable object. Parameters whose names are prefixed with x-oss-meta- are considered the metadata of the object. 
# headers['x-oss-meta-author'] = 'Alice'
# result = bucket.append_object(exampledir/exampleobject.txt, 0, 'content of first append', headers=headers)

# Set the position from which the first append operation starts to 0. 
# Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. 
result = bucket.append_object('exampledir/exampleobject.txt', 0, 'content of first append')
# If you have appended content to the object, you can obtain the position from which the current append operation starts from the next_position field in the response returned by the last operation or by using bucket.head_object. 
bucket.append_object('<yourObjectName>', result.next_position, 'content of second append')