R. David Murray added the comment:

You must have a different 'open' in your namespace when you execute that.  
Dropping a keyword argument like that is something we would never do without a 
deprecation period.

Your example works fine for me.

----------
nosy: +r.david.murray
resolution:  -> invalid
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19136>
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