AttributeError: 'Blob' object has no attribute 'download_as_bytes'

#### Problem description



Be sure your description clearly answers the following questions:



- What are you trying to achieve?

   Trying to pull a file from gcp storage



- What is the expected result?

 I can read a file from gcp storage



- What are you seeing instead?

 Error: AttributeError: 'Blob' object has no attribute 'download_as_bytes'



#### Steps/code to reproduce the problem

Failed on this line: `for line in open(file, 'r'):`

I think it gets the file open and begins reading for the loop when it fails.





In order for us to be able to solve your problem, we have to be able to reproduce it on our end.

Without reproducing the problem, it is unlikely that we'll be able to help you.



Include full tracebacks, logs and datasets if necessary.

Please keep the examples minimal ([minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example)).



Apr 05 16:19:30 <host> docker[2234166]:   File "/usr/local/lib/python3.7/site-packages/smart_open/gcs.py", line 325, in read1

Apr 05 16:19:30 <host> docker[2234166]:     return self.read(size=size)

Apr 05 16:19:30 <host> docker[2234166]:   File "/usr/local/lib/python3.7/site-packages/smart_open/gcs.py", line 320, in read

Apr 05 16:19:30 <host> docker[2234166]:     self._fill_buffer(size)

Apr 05 16:19:30 <host> docker[2234166]:   File "/usr/local/lib/python3.7/site-packages/smart_open/gcs.py", line 374, in _fill_buffer

Apr 05 16:19:30 <host> docker[2234166]:     bytes_read = self._current_part.fill(self._raw_reader)

Apr 05 16:19:30 <host> docker[2234166]:   File "/usr/local/lib/python3.7/site-packages/smart_open/bytebuffer.py", line 152, in fill

Apr 05 16:19:30 <host> docker[2234166]:     new_bytes = source.read(size)

Apr 05 16:19:30 <host> docker[2234166]:   File "/usr/local/lib/python3.7/site-packages/smart_open/gcs.py", line 178, in read

Apr 05 16:19:30 <host> docker[2234166]:     binary = self._download_blob_chunk(size)

Apr 05 16:19:30 <host> docker[2234166]:   File "/usr/local/lib/python3.7/site-packages/smart_open/gcs.py", line 194, in _download_blob_chunk

Apr 05 16:19:30 i<host> docker[2234166]:     binary = self._blob.download_as_bytes(start=start, end=end)

Apr 05 16:19:30 <host> docker[2234166]: AttributeError: 'Blob' object has no attribute 'download_as_bytes'

Apr 05 16:19:30 <host> docker[2234166]: I0405 16:19:30.721222 139676694796096 gcs.py:241] close: called





#### Versions



Please provide the output of:



```python

import platform, sys, smart_open

print(platform.platform())

print("Python", sys.version)

print("smart_open", smart_open.__version__)

```

Python 3.7.10 (default, Apr  2 2021, 22:24:51) 

[GCC 8.3.0] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> import platform, sys, smart_open

>>> print(platform.platform())

Linux-5.4.89+-x86_64-with-debian-10.9

>>> print("Python", sys.version)

Python 3.7.10 (default, Apr  2 2021, 22:24:51) 

[GCC 8.3.0]

>>> print("smart_open", smart_open.__version__)

smart_open 5.0.0





Tried on the latest 4 version too, same thing.





#### Checklist



Before you create the issue, please make sure you have:



- [x] Described the problem clearly

- [x] Provided a minimal reproducible example, including any required data

- [x] Provided the version numbers of the relevant software

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