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How to solve the error "AttributeError: 'str' object has no attribute 'tell'" when uploading files on Google Cloud Storage in Python

Cloud Computing
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Google Cloud Platform
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Cloud Storage
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Troubleshooting
schedule Jul 1, 2022
Last updated
local_offer Cloud Computing
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tocTable of Contents
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We encounter this error when we try to write a file to Google Cloud Storage (GCS) in Python like so:

from google.cloud import storage

path_to_private_key = './gcs-project-354207-099ef6796af6.json'
client = storage.Client.from_service_account_json(json_credentials_path=path_to_private_key)
bucket = client.get_bucket('example-bucket-skytowner')
blob = bucket.blob('uploaded_sample.txt')
blob.upload_from_file('./sample.txt')
AttributeError: 'str' object has no attribute 'tell'

Here, the highlighted line is causing the error.

The fix is to use the method upload_from_filename(~) instead which expects the path of the file you wish to upload on GCS:

blob.upload_from_filename('./sample.txt')

On the other hand, the method upload_from_file(~) expects a file object, which can be obtained like so:

with open('./sample.txt', 'rb') as file:
blob.upload_from_file(file)

Here, the second parameter 'rb' means that we wish to read the file in binary format, which is what the upload_from_file(~) method expects.

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Published by Isshin Inada
Edited by 0 others
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