John Szakmeister <j...@szakmeister.net> added the comment:
The offending lines in io.py are:
modes = set(mode)
if modes - set("arwb+tU") or len(mode) > len(modes):
raise ValueError("invalid mode: %r" % mode)
In particular, the "or len(mode) > len(modes)" is picking off the fact
that there is repeated mode characters. Leaving that off allows
io.open() to behave exactly like the built-in open() call.
OTOH, someone obviously wanted to make sure that repeat mode characters
were not allowed. So I guess someone needs to rule on whether we want
io.open() and io.FileIO() to behave like the built-in, or to keep things
more strict.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue4829>
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