[stdlib-sig] argparse -- binary IO via standard streams

June 5, 2012

      Hello,

in Python 3, this is a TypeError:
...
...
...
sys.stdout.write(b"hello, world\n")
At the moment, argparse.FileType.__call__("-") unconditionally returns
sys.stdout even if mode is binary so writing binary data will fail if
the user selects to write it to stdout.

I'm not sure if this is the best possible solution but at least the
following patch to argparse.py would fix the aforementioned problem.

Moritz

1154c1154,1157
<                 return _sys.stdin
---
...
if 'b' in self._mode:
                    return _sys.stdin.buffer
                else:
                    return _sys.stdin
1156c1159,1162
<                 return _sys.stdout
---
...
if 'b' in self._mode:
                    return _sys.stdout.buffer
                else:
                    return _sys.stdout
-- 
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[stdlib-sig] argparse -- binary IO via standard streams

Moritz Klammler