[issue19801] Concatenating bytes is much slower than concatenating strings

[Antoine Pitrou]

Antoine Pitrou added the comment:

Indeed. If you want to concatenate a lot of bytes objects efficiently, there are three solutions:
- concatenate to a bytearray
- write to a io.BytesIO object
- use b''.join to concatenate all objects at once

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nosy: +pitrou

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<http://bugs.python.org/issue19801>
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