[New-bugs-announce] [issue25510] fileinput.FileInput.readline() always returns str object at the end even if in 'rb' mode

[Ryosuke Ito]

New submission from Ryosuke Ito:

In Python3, fileinput.FileInput.readline() always returns str object at the end,
even if in 'rb' mode.
Here's a test code.

import fileinput

fi = fileinput.input('test_fileinput.py', mode='rb')

while True:
    line = fi.readline()
    assert isinstance(line, bytes)
    if not len(line):
        break

It fails in Python3.2 to 3.5.

I wrote a patch for this.
With it, the test above passes.

----------
files: fileinput.py.diff
keywords: patch
messages: 253675
nosy: Ryosuke Ito
priority: normal
severity: normal
status: open
title: fileinput.FileInput.readline() always returns str object at the end even if in 'rb' mode
Added file: http://bugs.python.org/file40895/fileinput.py.diff

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<http://bugs.python.org/issue25510>
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