unable to open() files with mode="xb"

[FelixSchwarz]

Python 3.5.2 (default, Sep 14 2016, 11:28:32) 
[GCC 6.2.1 20160901 (Red Hat 6.2.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pyfakefs.fake_filesystem_unittest import Patcher
>>> stubber = Patcher()
>>> stubber.setUp()
>>> fp = open('foo.txt', 'xb')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "…/pyfakefs/fake_filesystem.py", line 3416, in __call__
    return self.Call(*args, **kwargs)
  File "…/pyfakefs/fake_filesystem.py", line 3459, in Call
    raise ValueError('Invalid mode: %r' % orig_modes)
ValueError: Invalid mode: 'xb'

[mrbean-bremen]

@FelixSchwarz - please check if this fixes your problem.

[FelixSchwarz]

Yes, this works for me. Thank you very much!

[mrbean-bremen]

Thanks for the report!