Setting an Object Expiration Time (SDK for Python)

obsClient = ObsClient(access_key_id=ak, secret_access_key=sk, server=server)
try:
    # Read a file stream.
    content = open('localfile', 'rb')
    bucketName = "examplebucket"
    objectKey = "objectname"
    header=PutObjectHeader()
    #Set the expiration time.
    header.expires=10
    # Upload the file stream.
    resp = obsClient.putContent(bucketName, objectkey, content,headers=header)
    # If status code 2xx is returned, the API is called successfully. Otherwise, the API call fails.
    if resp.status < 300:
        print('Put Content Succeeded')
        print('requestId:', resp.requestId)
    else:
        print('Put Content Failed')
        print('requestId:', resp.requestId)
        print('errorCode:', resp.errorCode)
        print('errorMessage:', resp.errorMessage)
except:
    print(traceback.format_exc())

obsClient = ObsClient(access_key_id=ak, secret_access_key=sk, server=server)
try:
    # Read a file stream.
    content = open('localfile', 'rb')
    bucketName = "examplebucket"
    objectKey = "objectname"
    header=PutObjectHeader()
    # Use a user-defined header to set the expiration time.
    extensionHeaders = {'x-obs-expires': 30}
    # Upload the file stream.
    resp = obsClient.putContent(bucketName, objectkey, content,extensionHeaders=extensionHeaders)
    # If status code 2xx is returned, the API is called successfully. Otherwise, the API call fails.
    if resp.status < 300:
        print('Put Content Succeeded')
        print('requestId:', resp.requestId)
    else:
        print('Put Content Failed')
        print('requestId:', resp.requestId)
        print('errorCode:', resp.errorCode)
        print('errorMessage:', resp.errorMessage)
except:
    print(traceback.format_exc())

obsClient = ObsClient(access_key_id=ak, secret_access_key=sk, server=server)
try:
    bucketName = "examplebucket"
    objectKey = "objectname"
    # Use a user-defined header to set the expiration time.
    extensionHeaders = {'x-obs-expires': 30}
    # Configure metadata for the object.
    resp = obsClient.setObjectMetadata(bucketName, objectkey, extensionHeaders=extensionHeaders)
    # If status code 2xx is returned, the API is called successfully. Otherwise, the API call fails.
    if resp.status < 300:
        print('Set Object Metadata Succeeded')
        print('requestId:', resp.requestId)
    else:
        print('Set Object Metadata Failed')
        print('requestId:', resp.requestId)
        print('errorCode:', resp.errorCode)
        print('errorMessage:', resp.errorMessage)
except:
    print(traceback.format_exc())