I'm getting "Access Denied" trying to open a GCS file for writing. I'm 
using these 
instructions: 
https://cloud.google.com/appengine/docs/python/googlecloudstorageclient/read-write-to-cloud-storage.
 
Googling not helping much. Thanks in advance.
 
Here's my code and the error:

        bucket_name = os.environ.get('BUCKET_NAME', 
app_identity.get_default_gcs_bucket_name())
        filename = '/' + bucket_name + '/' + 'myfile'
        print filename
        gcs_file = gcs.open(filename,
                            'w',
                            content_type='text/plain')

ForbiddenError: Expect status [201] from Google Storage. But got status 403.
Path: '/app_default_bucket/myfile'.
Request headers: {'accept-encoding': 'gzip, *', 'content-type': 
'text/plain', 'x-goog-api-version': '2', 'x-goog-resumable': 'start'}.
Response headers: {'server': 'UploadServer', 'vary': 'Origin', 
'content-length': '210', 'x-guploader-uploadid': 
'AEnB2UrEb9QG7lLMhN-Fu_kjPLbVwSuKfufgxIufy37ENZq0bK97IMaPdIuxA0ao4pTfuGAhZyi5hWzG5eqvBKEFk0nwheghJbkH4MlUSgFdKVzkFgt6rO8',
 
'content-type': 'application/xml; charset=UTF-8', 'alt-svc': 'quic=":443"; 
ma=2592000; v="36,35,34"', 'date': 'Sat, 03 Dec 2016 17:33:41 GMT'}.
Body: "<?xml version='1.0' 
encoding='UTF-8'?><Error><Code>AccessDenied</Code><Message>Access 
denied.</Message><Details>Caller does not have storage.objects.create 
access to bucket app_default_bucket.</Details></Error>".
Extra info: None.

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