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Difference between blob and get_blob in Google Cloud Storage's Python library

Cloud Computing
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Google Cloud Platform
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Cloud Storage
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Python client library
schedule Jul 1, 2022
Last updated
local_offer Cloud Computing
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The similarity and difference between the methods blob(~) and get_blob(~) in Google Cloud Storage (GCS)'s Python client library are as follows:

  • blob(~) and get_blob(~) both return a Blob object.

  • the main difference between blob(~) and get_blob(~) is that, blob(~) does not actually send any request to GCS, while get_blob(~) fetches meta-information about the blob from GCS. There are two main implications of this:

    • calling blob('cat.png') will not send a request to GCS so we are not sure if this file actually exists on GCS. On the other hand, calling get_blob('cat.png') will send a request to GCS to fetch the meta-information of the cat.png. If the cat.png does not exist, then None is returned.

    • meta-information (e.g. size) is available only to blob objects fetched by get_blob(~) but not by blob(~):

      from google.cloud import storage

      # Authenticate ourselves using the primary key of the service account
      path_to_private_key = './gcs-project-354207-099ef6796af6.json'
      client = storage.Client.from_service_account_json(json_credentials_path=path_to_private_key)

      bucket = storage.Bucket(client, 'example-bucket-skytowner')
      blob = bucket.get_blob('cat.png')
      print(f'[get_blob] {blob.size} bytes')

      blob = bucket.blob('cat.png')
      print(f'[blob] {blob.size} bytes')
      [get_blob] 160546 bytes
      [blob] None bytes

      Here, notice how blob.size returns None when we use the blob(~) constructor. Also, to learn how to generate the primary key of a service account, please consult our guide here.

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Published by Isshin Inada
Edited by 0 others
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