Error with Spyder IPython Shell - AttributeError: 'NoneType' object has no attribute 'fileno'

[shahrukhkhan489]

This issue is on MacOS. Have checked Issue #8668, and the pull request fix seems to be there.

Error in callback <function sys_pipes_forever at 0x11a3477a0> (for pre_execute):
Traceback (most recent call last):

  File "/Users/skhan/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 331, in sys_pipes_forever
    _mighty_wurlitzer.__enter__()

  File "/Users/skhan/opt/anaconda3/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)

  File "/Users/skhan/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 298, in pipes
    with w:

  File "/Users/skhan/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 151, in __enter__
    pipe = self._setup_pipe('stdout')

  File "/Users/skhan/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 100, in _setup_pipe
    real_fd = getattr(sys, '__%s__' % name).fileno()

AttributeError: 'NoneType' object has no attribute 'fileno'```

Have taken a reference from https://github.com/spyder-ide/spyder-kernels/commit/e3847f1d167a49b35d1307db21ad57fb868d34c5

[ccordoba12]

I think this is fixed in the latest wurlitzer version. Please update it and try again.

[ncneal]

I just updated to Spyder 4 and am getting the following on MacOS:

Traceback (most recent call last):

  File "/Users/nickneal/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 339, in sys_pipes_forever
    _mighty_wurlitzer.__enter__()

  File "/Users/nickneal/anaconda3/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)

  File "/Users/nickneal/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 306, in pipes
    with w:

  File "/Users/nickneal/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 158, in __enter__
    pipe = self._setup_pipe('stdout')

  File "/Users/nickneal/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 107, in _setup_pipe
    real_fd = getattr(sys, '__%s__' % name).fileno()

AttributeError: 'NoneType' object has no attribute 'fileno'

I have the latest wurlitzer version but am still getting this message anytime I use the console.

Edit: downgraded Spyder to 3.3.6 and still have the same issue

[ccordoba12]

@impact27, could you help us with this one? We could simply catch the error and print an informative message about it.

[impact27]

I don't think this touches spyder code, so I'm not sure where we could catch that. We should open an issue on https://github.com/minrk/wurlitzer. Do you have a way of reproducing the error?

[impact27]

I opened minrk/wurlitzer#36

[ccordoba12]

Thanks @impact27!

[muhlbach]

I'm experiencing the same issue with wurlitzer=2.0.0, spyder=4.0.1 and python=3.7.0. I'm running macOS 10.15.3. Any updates or fixes?

Python 3.7.0 (default, Jun 28 2018, 07:39:16) 
Type "copyright", "credits" or "license" for more information.

IPython 7.12.0 -- An enhanced Interactive Python.
Error in callback <function sys_pipes_forever at 0x11e652320> (for pre_execute):
Traceback (most recent call last):

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 339, in sys_pipes_forever
    _mighty_wurlitzer.__enter__()

  File "/opt/anaconda3/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 306, in pipes
    with w:

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 158, in __enter__
    pipe = self._setup_pipe('stdout')

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 107, in _setup_pipe
    real_fd = getattr(sys, '__%s__' % name).fileno()

AttributeError: 'NoneType' object has no attribute 'fileno'

[impact27]

@muhlback
Do you have any idea why sys.__stdout__ is None in your case? Can you check if this is the case?

[muhlbach]

@impact27:

Do you mean like this?

import sys

sys.__stdout__
Error in callback <function sys_pipes_forever at 0x119208320> (for pre_execute):
Traceback (most recent call last):

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 339, in sys_pipes_forever
    _mighty_wurlitzer.__enter__()

  File "/opt/anaconda3/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 306, in pipes
    with w:

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 158, in __enter__
    pipe = self._setup_pipe('stdout')

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 107, in _setup_pipe
    real_fd = getattr(sys, '__%s__' % name).fileno()

AttributeError: 'NoneType' object has no attribute 'fileno'

[impact27]

You can do:

import sys
print(str(sys.__stdout__))

I can reproduce this bug if I write (Which is probably not a good idea):

sys.__stdout__ = None

[impact27]

So is this a bug you get on a used console that ran code that might have done sys.__stdout__ = None or do you get this on a new console?

[muhlbach]

I confirm that this gives None:

import sys
print(str(sys.__stdout__))
Error in callback <function sys_pipes_forever at 0x12043a320> (for pre_execute):
Traceback (most recent call last):

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 339, in sys_pipes_forever
    _mighty_wurlitzer.__enter__()

  File "/opt/anaconda3/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 306, in pipes
    with w:

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 158, in __enter__
    pipe = self._setup_pipe('stdout')

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 107, in _setup_pipe
    real_fd = getattr(sys, '__%s__' % name).fileno()

AttributeError: 'NoneType' object has no attribute 'fileno'

None

This happens when I start a new console.

[impact27]

I don't really understand how this is possible:

• What about sys.stdout?
• Do you run any code on startup? (Preferences -> iPython console -> Stratup -> Run Code)
• From https://docs.python.org/3.8/library/sys.html it is possible but we are connected to a console:

Note

Under some conditions stdin, stdout and stderr as well as the original values stdin, stdout and stderr can be None. It is usually the case for Windows GUI apps that aren’t connected to a console and Python apps started with pythonw.

[muhlbach]

Also None when I print sys.__stdout__.

I don't run any code on start up:

[impact27]

What about:

import sys
print(str(sys.__stdout__), str(sys.stdout), str(sys.__stderr__), str(sys.stderr))

[muhlbach]

import sys
print(str(sys.__stdout__), str(sys.stdout), str(sys.__stderr__), str(sys.stderr))
Error in callback <function sys_pipes_forever at 0x11833a320> (for pre_execute):
Traceback (most recent call last):

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 339, in sys_pipes_forever
    _mighty_wurlitzer.__enter__()

  File "/opt/anaconda3/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 306, in pipes
    with w:

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 158, in __enter__
    pipe = self._setup_pipe('stdout')

  File "/opt/anaconda3/lib/python3.7/site-packages/wurlitzer.py", line 107, in _setup_pipe
    real_fd = getattr(sys, '__%s__' % name).fileno()

AttributeError: 'NoneType' object has no attribute 'fileno'

None <ipykernel.iostream.OutStream object at 0x117dec150> <_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'> <ipykernel.iostream.OutStream object at 0x117dec0d0>

Btw thank you for your persistency!

[impact27]

Check if you have the latest version of ipykernel maybe?
Workaround:

import sys; sys.__stdout__ = sys.__stderr__

[muhlbach]

I'm running with ipykernel=5.1.4 (py37h39e3cac_0), which should be the latest version.

[yotamcons]

I have the same issue with spyder 3.3.6 and python 3.6 on macOS 10.15.4
it goes away if I exit Spyder and than reopen

[JM-RPC]

I ran into the same error when calling Sypder3 from a bash shell (Python 3.7.4 IPython 7.14.0). I noticed it was complaining about pipes, so I did the naive thing, invoked Spyder sending stdout and stderr to /dev/null e.g:

/usr/bin/spyder3 &>/dev/null &

and the problem seemed to go away.

[impact27]

@ccordoba12 Should we disable wurlitzer if stdout is disabled?

[impact27]

Fixed by minrk/wurlitzer#44

[ccordoba12]

Great! Closing this one then.