---------------------------------------------------------------------------
UnsupportedOperation                      Traceback (most recent call last)
<ipython-input-8-a3517d055ccb> in <module>
----> 1 mne.bem.make_watershed_bem(fs_subject, overwrite=True)

</home/christian/mne-python/mne/externals/decorator.py:decorator-gen-50> in make_watershed_bem(subject, subjects_dir, overwrite, volume, atlas, gcaatlas, preflood, show, copy, T1, brainmask, verbose)

~/mne-python/mne/utils/_logging.py in wrapper(*args, **kwargs)
     88             with use_log_level(verbose_level):
     89                 return function(*args, **kwargs)
---> 90         return function(*args, **kwargs)
     91     return FunctionMaker.create(
     92         function, 'return decfunc(%(signature)s)',

~/mne-python/mne/bem.py in make_watershed_bem(subject, subjects_dir, overwrite, volume, atlas, gcaatlas, preflood, show, copy, T1, brainmask, verbose)
   1148                 % (ws_dir, ' '.join(cmd)))
   1149     os.makedirs(op.join(ws_dir))
-> 1150     run_subprocess_env(cmd)
   1151     if op.isfile(T1_mgz):
   1152         new_info = _extract_volume_info(T1_mgz)

</home/christian/mne-python/mne/externals/decorator.py:decorator-gen-1> in run_subprocess(command, return_code, verbose, *args, **kwargs)

~/mne-python/mne/utils/_logging.py in wrapper(*args, **kwargs)
     88             with use_log_level(verbose_level):
     89                 return function(*args, **kwargs)
---> 90         return function(*args, **kwargs)
     91     return FunctionMaker.create(
     92         function, 'return decfunc(%(signature)s)',

~/mne-python/mne/utils/misc.py in run_subprocess(command, return_code, verbose, *args, **kwargs)
    113         The return code, only returned if ``return_code == True``.
    114     """
--> 115     with running_subprocess(command, *args, **kwargs) as p:
    116         stdout_, stderr = p.communicate()
    117     stdout_ = u'' if stdout_ is None else stdout_.decode('utf-8')

~/anaconda3/lib/python3.7/contextlib.py in __enter__(self)
    110         del self.args, self.kwds, self.func
    111         try:
--> 112             return next(self.gen)
    113         except StopIteration:
    114             raise RuntimeError("generator didn't yield") from None

~/mne-python/mne/utils/misc.py in running_subprocess(command, after, verbose, *args, **kwargs)
    187     try:
    188         print(args, kwargs)
--> 189         p = subprocess.Popen(command, *args, **kwargs)
    190     except Exception:
    191         if isinstance(command, str):

~/anaconda3/lib/python3.7/subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors, text)
    726         (p2cread, p2cwrite,
    727          c2pread, c2pwrite,
--> 728          errread, errwrite) = self._get_handles(stdin, stdout, stderr)
    729 
    730         # We wrap OS handles *before* launching the child, otherwise a

~/anaconda3/lib/python3.7/subprocess.py in _get_handles(self, stdin, stdout, stderr)
   1357             else:
   1358                 # Assuming file-like object
-> 1359                 c2pwrite = stdout.fileno()
   1360 
   1361             if stderr is None:

UnsupportedOperation: fileno

import sys
print("#1:", sys.stdout)
print("#2:", sys.__stdout__)
print("#3:", sys.__stdout__.fileno())
print("#4:", sys.stdout.fileno())

#1: <ipykernel.iostream.OutStream object at 0x7fc4e055fdd0>
#2: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>
#3: 1

---------------------------------------------------------------------------
UnsupportedOperation                      Traceback (most recent call last)
<ipython-input-19-ac77b7d7dd6f> in <module>
      3 print("#2:", sys.__stdout__)
      4 print("#3:", sys.__stdout__.fileno())
----> 5 print("#4:", sys.stdout.fileno())

UnsupportedOperation: fileno