Марк Коренберг added the comment:
https://docs.python.org/3.5/library/io.html?highlight=stringio#id3 :
Also, TextIOWrapper.tell() and TextIOWrapper.seek() are both quite slow due to
the reconstruction algorithm used.
What is reconstruction algorightm ? Experiments show, that seek() and tell()
returns values of count of bytes (not letters).
#!/usr/bin/python3.5
import tempfile
with tempfile.TemporaryFile(mode='r+t') as f:
l = f.write('привет')
print(l, f.tell()) # "6 12"
f.seek(3)
f.write('прекол42')
f.seek(0)
print(f.read()) # raise UnicodeDecodeError
So, please reopen. Issue is still here.
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<http://bugs.python.org/issue25849>
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