ValueError: Unable to configure formatter 'default'

[Alisha Jain]

Hi,

I creating a python application which uses uvicorn module. The code runs successfully, however, when I create a exe using pyinstaller, It is able to create the executable but I see following error when I run the exe file. Please help.

[Steve Barnes]

Hi Alisha,

 

I have seen this problem before and eventually figured out the cause. You are directly or indirectly using either stdout or stderr as an out put for logger but pyinstaller and some or most exe builders produce exes which, when running in Windowed mode, set both of these to None and logger fails like this because None as the exception says doesn’t have an istty or any other methods.

 

Some possible solutions include:

• Set the application to be a console application so that it will open a terminal window (it can still use the GUI but log messages will go to the terminal quick but dirty
• If the application has the frozen attribute or set sys.stdout is None and no log file is specified then create your logger with the file set to os.devnull this will discard all logs
• Use logging.NullHandler if frozen or sys.stdout is None.
• Always log to a file but please consider using logging.RotatingFileHandler as the default handler if frozen or sys.stdout is None.

 

Hope that this helps.

 

Steve

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[Eric Fahlgren]

Steve,

That seems common and broad enough that you should consider adding a wiki page for it...

https://github.com/pyinstaller/pyinstaller/wiki/Recipes

Eric

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[Alisha Jain]

Thank you Steve for your response.

The logging that it refers to is from uvicorn module and doesn't come from my code. So I tried updating all the relevant modules but nothing helped.

Finally, I updated my pip module, followed by pyinstaller module update. This helped and I am able to run the exe successfully.

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[Chris Barker - NOAA Federal]

Hmm,

Seems this is a bug / missing feature in PyIntaller. Writing to stdout/err is pretty common dnd can be done down in the stack of libraries, so not always in full control of the application author. 

Is there a /dev/null equiv on Windows? Or a “hidden” console that can be written to (I think that’s what Mac GUI apps use — you can open the “console” app and see output.)

Or a dummy file object in the stdlib that could be used?

-CHB

Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
NOAA/NOS/OR&R            (206) 526-6959   voice
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Seattle, WA  98115       (206) 526-6317   main reception

On Apr 25, 2023, at 11:42 PM, Steve Barnes <Gadge...@live.co.uk> wrote:



Hi Alisha,

 

I have seen this problem before and eventually figured out the cause. You are directly or indirectly using either stdout or stderr as an out put for logger but pyinstaller and some or most exe builders produce exes which, when running in Windowed mode, set both of these to None and logger fails like this because None as the exception says doesn’t have an istty or any other methods.

 

Some possible solutions include:

• Set the application to be a console application so that it will open a terminal window (it can still use the GUI but log messages will go to the terminal quick but dirty
• If the application has the frozen attribute or set sys.stdout is None and no log file is specified then create your logger with the file set to os.devnull this will discard all logs
• Use logging.NullHandler if frozen or sys.stdout is None.
• Always log to a file but please consider using logging.RotatingFileHandler as the default handler if frozen or sys.stdout is None.

 

Hope that this helps.

 

Steve

 

From: pyins...@googlegroups.com <pyins...@googlegroups.com> On Behalf Of Alisha Jain
Sent: Monday, April 24, 2023 5:14 PM
To: PyInstaller <pyins...@googlegroups.com>
Subject: [PyInstaller] ValueError: Unable to configure formatter 'default'

 

Hi,

 

I creating a python application which uses uvicorn module. The code runs successfully, however, when I create a exe using pyinstaller, It is able to create the executable but I see following error when I run the exe file. Please help.

 

<image001.png>

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[Steve Barnes]

Hi Chris,

 

The python standard library os.devnull gives an operating system independent equivalent to /dev/null (IIRC it actually maps to /dev/null on *nix systems) – including MS Windows.

 

I have suggested in the past that python exe generators could/should set both stdout and stderr to os.devnull for windowed exes rather than using None in that case.

 

All the best,

Steve Barnes

To view this discussion on the web visit https://groups.google.com/d/msgid/pyinstaller/931E8665-50B5-4BAC-A4E6-09C5A5F02546%40noaa.gov.

[Steve Barnes]

Eric,

 

Good Idea & done with the os.devnull solution!

 

Steve

 

From: pyins...@googlegroups.com <pyins...@googlegroups.com> On Behalf Of Eric Fahlgren

Sent: Wednesday, April 26, 2023 3:09 PM
To: pyins...@googlegroups.com

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[Chris Barker]

Hi folks,

I ran into this old issue just today -- and looking at the docs, I see:

https://pyinstaller.org/en/stable/common-issues-and-pitfalls.html?highlight=os.devnull#sys-stdin-sys-stdout-and-sys-stderr-in-noconsole-windowed-applications-windows-only

So I have my solution.

But is it possible that PyInstaller could do it by default for Windows apps?

Thanks,

  -CHB

To view this discussion on the web visit https://groups.google.com/d/msgid/pyinstaller/DU0P194MB18199CB7A26C857CAF04E9B99B659%40DU0P194MB1819.EURP194.PROD.OUTLOOK.COM.

--

Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
NOAA/NOS/OR&R            (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
Seattle, WA  98115       (206) 526-6317   main reception

Chris....@noaa.gov

[bwoodsend]

But is it possible that PyInstaller could do it by default for Windows apps?

I’d be rather raise the question of why doesn’t pythonw.exe do it by default.

We don’t particularly like adding accommodations for broken code and, with Python’s current handling of windowed mode (even though almost no one realises that it exists), any direct access to the standard pipes without checking they’re not None is broken code.

​

[Chris Barker]

On Fri, Aug 2, 2024 at 4:14 PM bwoodsend <bwoo...@gmail.com> wrote:

But is it possible that PyInstaller could do it by default for Windows apps?

I’d be rather raise the question of why doesn’t pythonw.exe do it by default.

Really good point -- that's of course what it should do.

We don’t particularly like adding accommodations for broken code and, with Python’s current handling of windowed mode (even though almost no one realises that it exists), any direct access to the standard pipes without checking they’re not None is broken code.

well, it's pythonw that's broken, but point taken. 

https://github.com/python/cpython/issues/122633

I was pretty surprised that I only found two relevant issues on this.

we'll see.

Thanks,

  -CHB

[bwoodsend]

On a semi-related note, I think we need to reword that piece of documentation. The recommended approach is to wrap your own usages of sys.stderr and sys.stdout in is not None checks and to encourage offending libraries to do the same. The os.devnull hack is suggested only as a last resort in case library maintainers refuse to add their own guards. However, everyone seems to be misinterpreting it as the recommended fix.

​