AWS S3 write an object - TypeError: expected string or bytes-like object

Question

I'm trying to write a simple txt file to S3 using boto3. No matter what I do it would throw the same error. The variable 'msg' is a string. In theory it should have been accepted but it did not work. So I encoded it, still doesn't work. Any ideas? TIA

report = s3.Object(bucket, reportfilename)
byte_msg=bytes(msg, 'utf-8')
s3put = report.put(Body=byte_msg)

Traceback (most recent call last):
  File "/Users/ardey/Google Drive/Tutorials/Python/aws_boto3/s3-interactions.py", line 44, in <module>
    s3put = report.put(Body="""
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/boto3/resources/factory.py", line 520, in do_action
    response = action(self, *args, **kwargs)
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/boto3/resources/action.py", line 83, in __call__
    response = getattr(parent.meta.client, operation_name)(*args, **params)
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/client.py", line 386, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/client.py", line 677, in _make_api_call
    request_dict = self._convert_to_request_dict(
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/client.py", line 723, in _convert_to_request_dict
    api_params = self._emit_api_params(
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/client.py", line 752, in _emit_api_params
    self.meta.events.emit(
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/hooks.py", line 356, in emit
    return self._emitter.emit(aliased_event_name, **kwargs)
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/hooks.py", line 228, in emit
    return self._emit(event_name, kwargs)
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/hooks.py", line 211, in _emit
    response = handler(**kwargs)
  File "/Users/ardey/anaconda3/lib/python3.8/site-packages/botocore/handlers.py", line 231, in validate_bucket_name
    if not VALID_BUCKET.search(bucket) and not VALID_S3_ARN.search(bucket):
TypeError: expected string or bytes-like object

@balderman No its not - msg=""" --------------------------------------------- Memory usage report for publish1 for {} --------------------------------------------- Combined memory usage: {} -------------------------------------------- """.format(reportdt,total_mem) — Codistan
– Codistan, Commented Aug 14, 2021 at 18:14
What is bucket? Looks like it's supposed to be a string and it's not. — Alex Hall
– Alex Hall, Commented Aug 14, 2021 at 18:48
try put_object: boto3.client('s3').put_object(Body=obj, Bucket=bucket, Key=key) where all the values are strings — Jonathan Leon
– Jonathan Leon, Commented Aug 14, 2021 at 19:12

jscott · Accepted Answer · 2021-08-14 21:25:53Z

3

The error is thrown in block if not VALID_BUCKET.search(bucket) and not VALID_S3_ARN.search(bucket)

Per the docs, s3.Object constructor accepts bucket_name (string) and key (string) as arguments. Make sure you're passing the bucket name as a string and not as a Bucket object.

answered Aug 14, 2021 at 21:25

jscott

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