>>> from io import *
>>> text = TextIOWrapper(BytesIO(), "iso-2022-jp")
>>> text.write(u"P")
1
>>> text.tell()
1
>>> text.write(u"anter 正")
7
>>> text.tell()
12
>>> text.write(u"孝")
1
>>> text.seek(12)
12
>>> text.read()  # Should return 孝, not ASCII
"9'"
>>> text.buffer.getvalue()
b"Panter \x1b$B@59'"
>>> text.seek(1)
1
>>> text.read(7)
'anter 正'
>>> text.tell()  # Another bug?
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'iso2022_jp' codec can't decode bytes in position 2-3: illegal multibyte sequence