INADA Naoki added the comment:
This patch doesn't change current behavior of "decode by chunk".
It's difficult to support changing encoding via header, like
Python's encoding cookie.
>>> import io
>>> buff = io.BytesIO("hello\nこんにちは".encode('utf-8'))
>>> f = io.TextIOWrapper(buff, encoding='ascii')
>>> f.readline()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/inada-n/work/python/cpython/Lib/encodings/ascii.py", line 26, in
decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe3 in position 6: ordinal
not in range(128)
>>>
>>> buff = io.BytesIO("hello\nこんにちは".encode('utf-8'))
>>> f = io.TextIOWrapper(buff, encoding='ascii')
>>> f.read(6)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/inada-n/work/python/cpython/Lib/encodings/ascii.py", line 26, in
decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe3 in position 6: ordinal
not in range(128)
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15216>
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