_NonClosingTextIOWrapper conflicts with Theano

[zstomp]

After updating Theano from 0.7.0 to 0.8.2 I'm getting the following error:

Exception TypeError: TypeError("'NoneType' object is not callable",) in <bound method _NonClosingTextIOWrapper.del of <_io.TextIOWrapper encoding='UTF-8'>> ignored

Tested with Click 5.1 and 6.6 on Python 2.7.11.

[mitsuhiko]

What is Theano?

[untitaker]

Apparently it is some sort of library. It doesn't appear to use Click, so I guess @zstomp uses both Theano and Click in his application.

@zstomp Please provide a full traceback of the error, because the error you provided doesn't make sense (in click._compat._NonClosingTextIOWrapper.__del__, all exceptions are caught)

[zstomp]

My bad, sorry for the vague report. The error appears exactly as above, no traceback provided. As I understand it, this is normal interpreter behavior when things crash in __del__().

Now that I've got a minute to debug it, I tried blank except: instead of except Exception:, and it caught it. Then I tried extending the handler to catch the stack trace, but it just can't print or write it to a file, the result is the same error message.

All I can think of is to find which part of my or library code triggers it. Let me know if you have better ideas for catching it.

[untitaker]

@zstomp A very basic application to reproduce the issue would be very useful so I can debug myself.

[zstomp]

Ok, it boils down to

import click
import theano.tensor


@click.command()
def main():
    click.echo("Test")


if __name__ == '__main__':
    main()

To set things up easily, install Miniconda package/environment manager, then

$ conda create -n test scipy
$ . activate test
$ pip install click==6.6 theano==0.8.2

[avloss]

having same issue - looking forward to a fix

[mitsuhiko]

@avloss is this with "Theano" too?

[mitsuhiko]

Looking at the source I have no idea how that error can even occur.

[avloss]

yes
Theano==0.8.1
click==6.6

I'll try investigating myself quickly.

[mitsuhiko]

My guess is that this is something in Theano and not click. We're not doing crazy things here.

[avloss]

You're right it's probably Theano

click/click/_compat.py

Line 71 in 57c6f09

self.detach()

this is what causing exception. Anyways - this is wrapped in "except: pass" so I'm hoping that Theano will work as expected. Will update if it'll be giving me any more problems.

[zstomp]

It turns out the problem is with six that is used by Theano. If you import six.moves.builtins and do click.echo(), you get the above-mentioned error.