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Non-ASCII output hangs execution in PyInstaller packaged app

See original GitHub issue
  • [Windows 10] OS
  • [3.7.3 ] Python Version
  • [1.0.3] Gooey Version
  • [3.5] PyInstaller

Hi, I’m having problem with running Gooey app packaged with PyInstaller. App prints some outputs to multi line textbox in “execution screen” but then hangs. App runs with no issues when running it non-packaged. I dug into it and appears the problem is with further printing to multi line box.


Exception in thread Thread-1:
Traceback (most recent call last):
  File "", line 917, in _bootstrap_inner
  File "", line 865, in run
  File "lib\site-packages\gooey\gui\", line 71, in _forward_stdout
  File "lib\site-packages\gooey\gui\", line 84, in _extract_progress
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf1 in position 16: invalid continuation byte

Changing stdout to the following fixed the problem:

utf8_stdout = os.fdopen(sys.stdout.fileno(), mode='w', encoding='utf-8', closefd=False)
sys.stdout = utf8_stdout

The issue seems to be related to this closed issue #230

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:11

github_iconTop GitHub Comments

maxhazcommented, Jan 24, 2020

Following this great resource, it seems that using the codecs module to redirect stdout and stderr works.

  1. Forget about the modification of
  2. Add near the top of your (main) script:
import codecs

if sys.stdout.encoding != 'UTF-8':
    sys.stdout = codecs.getwriter('utf-8')(sys.stdout.buffer, 'strict')
if sys.stderr.encoding != 'UTF-8':
    sys.stderr = codecs.getwriter('utf-8')(sys.stderr.buffer, 'strict')

If this works for you, that could be the solution.

Jakkwjcommented, Jan 3, 2022

For what it worth, here is the work around I found.

In Lib>site-packages>gooey>gui>, I added import local near the top of the file, and I replaced in __init__:

self.encoding = encoding


self.encoding = locale.getpreferredencoding().

The purpose is to by-pass the Gooey encoding setting and force to use the local system encoding for stdin and stdout when creating the subprocess.

(Note that other ways to get the system encoding, namely sys.getdefaultencoding(), sys.getfilesystemencoding(), sys.stdout.encoding, sys.stdin.encoding do not seem to work when used with pyinstaller, probably because pyinstaller freeze their value to the ‘dev machine’ system encoding instead of allowing to use the target machine system encoding)

To build one file with pyinstaller -F -w, this is the only way to solve my problem, as I am using: [Windows 7] OS [3.8.6 ] Python Version [] Gooey Version [ 4.7] PyInstaller Version

BTW, it should be import locale

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