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"""Warnings for using open() with an invalid mode string."""
open('foo.bar', 'w', 2)
open('foo.bar', 'rw') # [bad-open-mode]
open(name='foo.bar', buffering=10, mode='rw') # [bad-open-mode]
open(mode='rw', name='foo.bar') # [bad-open-mode]
open('foo.bar', 'U+') # [bad-open-mode]
open('foo.bar', 'rb+') # [bad-open-mode]
open('foo.bar', 'Uw') # [bad-open-mode]
open('foo.bar', 2)
open('foo.bar', buffering=2)
WRITE_MODE = 'w'
open('foo.bar', 'U' + WRITE_MODE + 'z') # [bad-open-mode]
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