Open S3 object as a string with Boto3

Question

I m aware that with Boto 2 it s possible to open an S3 object as a string with  get contents as string    Is there an equivalent function in boto3

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Python3   Using boto3 API approach   By using S3 Client download fileobj API and Python file-like object  S3 Object content can be retrieved to memory   Since the retrieved content is bytes  in order to convert to str  it need to be decoded   import io import boto3  client   boto3 client  s3   bytes buffer   io BytesIO   client download fileobj Bucket bucket name  Key object key  Fileobj bytes buffer  byte value   bytes buffer getvalue   str value   byte value decode    python3  default decoding is utf-8

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If body contains a io StringIO  you have to do like below   object get    Body   getvalue

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read will return bytes  At least for Python 3  if you want to return a string  you have to decode using the right encoding   import boto3  s3   boto3 resource  s3    obj   s3 Object bucket  key  obj get    Body   read   decode  utf-8

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This isn t in the boto3 documentation  This worked for me   object get    Body   read     object being an s3 object  http   boto3 readthedocs org en latest reference services s3 html object

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I had a problem to read parse the object from S3 because of  get   using Python 2 7 inside an AWS Lambda   I added json to the example to show it became parsable     import boto3 import json  s3   boto3 client  s3    obj   s3 get object Bucket bucket  Key key  j   json loads obj  Body   read      NOTE  for python 2 7   My object is all ascii  so I don t need  decode  utf-8    NOTE  for python 3 6    We moved to python 3 6 and discovered that read   now returns bytes so if you want to get a string out of it  you must use   j   json loads obj  Body   read   decode  utf-8

[python] Open S3 object as a string with Boto3

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