问题
There are some packages that returns values as bytes in my project. There is some configuration or environment variable to set so I don't need to decode bytes to string ever again? And if so, what is it?
回答1:
Python 2 by default can do what you want.
But let me advise: this is NOT what one really wants and that's why Python 3 does not do that automatically.
To convert bytes to str, you need to know the coding of the bytes:
s = b.decode(coding)
To convert str to bytes, you also need to know the desired coding:
b = s.encode(coding)
Python 2 assumed coding == 'ASCII' and thus worked for english / plain ASCII texts, but raised exceptions at runtime for everything else.
So, what you have to do is:
- decide whether something should be processed as text (in that case you use str) or as binary (then you keep bytes)
- decode early (after loading, receiving the bytes)
- process as str
- encode late (before saving, sending the bytes)
Nowadays utf-8 encoding is the most popular, so use that if you have no other requirements.
回答2:
No, I don't believe so. It is up to the packages as to how they return values in their methods.
来源：https://stackoverflow.com/questions/51227323/how-to-avoid-decoding-bytes-to-string-all-the-time