string argument expected, got 'bytes' in buffer.write

Question

I have this:

from io import StringIO
buffer = StringIO()

latest_file = 'C:\\Users\\miguel.santos\\Desktop\\meo_snapshots\\Snapshot_14.jpg'

buffer.write(open(latest_file,'rb').read())

TypeError: string argument expected, got 'bytes'

Any ideas on how to solve?

@zipa Probably, more consistent would be to not use StringIO for binary data (it's hard to use 'r' to read a JPEG file I assume.) — bipll
– bipll, Commented Jun 11, 2018 at 11:59

Serge Ballesta · Accepted Answer · 2018-06-11 12:39:45Z

50

io.StringIO is for unicode text, its counterpart for bytes is io.BytesIO. As your undelying file is a binary jpg, you really should use the latter:

from io import BytesIO
buffer = BytesIO()

latest_file = 'C:\\Users\\miguel.santos\\Desktop\\meo_snapshots\\Snapshot_14.jpg'

buffer.write(open(latest_file,'rb').read())

answered Jun 11, 2018 at 12:39

Serge Ballesta

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1 Comment

SYK Over a year ago

Indeed the io.BytesIO in py3 corresponds to cStringIO.StringIO in py2 better.

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