15.05.18 18:14, Skip Montanaro пише:
Consider this:bytes("abc", encoding="utf-8")b'abc' Looks reasonable. Then consider this:str(bytes("abc", encoding="utf-8"))"b'abc'" Why is the b'...' bit still there? I suppose it's because I didn't tell it explicitly how to decode the bytes object, as when I do, I get the expected result:str(bytes("abc", encoding="utf-8"), encoding="utf-8")'abc'
str() without 'encoding' and 'errors' calls __str__ which falls back to __repr__ by default.
bytes.__str__ falls back to bytes.__repr__, this makes errors of mixing bytes and strings more obvious. If run Python with the -b option, it will emit a BytesWarning first. If run it with -bb, it will become an error.
You can receive many interesting warning when run Python 2 with options -b and -3. Getting rid of these warnings will help with porting to Python 3 and may fix real bugs.
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