Elena Oat <oat.el...@gmail.com> added the comment:
I've modified a little your example and it's clearly that the readline moves
the cursor.
```
from __future__ import print_function
import codecs
import io
def run(stream):
offset = stream.tell()
try:
stream.seek(0)
header_row = stream.readline()
finally:
stream.seek(offset)
print(offset)
print(stream.tell())
print('Got header: %r' % header_row)
if stream.tell() == 0:
print(stream.tell())
print(stream.readline())
print('Skipping the header: %r' % stream.readline())
for index, line in enumerate(stream, start=2):
print('Line %d: %r' % (index, line))
b = io.BytesIO(u'ab\r\ncd\ndef\n'.encode('utf-16-le'))
s = codecs.EncodedFile(b, 'utf-8', 'utf-16-le')
run(s)
```
The first call to readline returns cd instead of ab.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33361>
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