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

问题

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?

回答1:

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())

来源：https://stackoverflow.com/questions/50797043/string-argument-expected-got-bytes-in-buffer-write