• Object Storage Service

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  2. Object Storage Service
  3. Developer Guide (Python SDK)
  4. Object Download
  5. Performing a Partial Download

Performing a Partial Download

When only partial data of an object is required, you can download data falling within a specific range. If the specified range is 0 to 1000, data at the 0th to the 1000th bytes, 1001 bytes in total, will be returned. If the specified range is invalid, data of the whole object will be returned. Sample code is as follows:

# Import the module.
from com.obs.client.obs_client import ObsClient
  
# Create an instance of ObsClient.
obsClient = ObsClient(
    access_key_id='*** Provide your Access Key ***',    
    secret_access_key='*** Provide your Secret Key ***',    
    server='yourdomainname'
)
from com.obs.models.get_object_header import GetObjectHeader
headers = GetObjectHeader()
# Set the start point and end point.
headers.range = '0-1000'

resp = obsClient.getObject('bucketname', 'objectkey', loadStreamInMemory=True, headers=headers)
if resp.status < 300:
    print('requestId:', resp.requestId)
    # Obtain the object content.
    print('buffer:', resp.body.buffer)
else:
    print('errorCode:', resp.errorCode)
    print('errorMessage:', resp.errorMessage)
NOTE:
  • If the specified range is invalid (because the start or end position is set to a negative integer or the range is larger than the object length), data of the whole object will be returned.