Parent parser issue with Python 3.13

[Warggr]

On my computer (Arch Linux, Python 3.13, Gooey 1.0.8.1), the following code:

from gooey import GooeyParser

base_parser = GooeyParser(add_help=False)
parser = GooeyParser(parents=[base_parser])

raises the following error:

Traceback (most recent call last):
  File "/tmp/gooey/main.py", line 4, in <module>
    parser = GooeyParser(parents=[base_parser])
  File "/tmp/gooey/venv/lib/python3.13/site-packages/gooey/python_bindings/gooey_parser.py", line 66, in __init__
    self.__dict__['parser'] = ArgumentParser(**kwargs)
                              ~~~~~~~~~~~~~~^^^^^^^^^^
  File "/usr/lib/python3.13/argparse.py", line 1821, in __init__
    raise TypeError('parents must be a list of ArgumentParser')
TypeError: parents must be a list of ArgumentParser

The issue also appears on Windows with Python 3.13. It does not appear on Ubuntu 22.04 with Python 3.12. So I assume that this is due to a change in argparse in Python 3.13.

[Warggr]

A workaround is to use parent.parser, but this removes the widget information. So this ¹ raises an error:

from gooey import Gooey, GooeyParser

@Gooey()
def main():
    base_parser = GooeyParser(add_help=False)
    base_parser.add_argument("a_file", widget="FileChooser")

    parser = GooeyParser(parents=[base_parser])
    parser.add_argument("b_file", widget="FileChooser")

    print(parser.parse_args())

if __name__ == "__main__":
    main()

and this works but does not show a FileChooser for a:

--- main.py
+++ fix.py
@@ -1,15 +1,15 @@
 from gooey import Gooey, GooeyParser
 
 @Gooey()
 def main():
     base_parser = GooeyParser(add_help=False)
     base_parser.add_argument("a_file", widget="FileChooser")
 
-    parser = GooeyParser(parents=[base_parser])
+    parser = GooeyParser(parents=[base_parser.parser])
     parser.add_argument("b_file", widget="FileChooser")
 
     print(parser.parse_args())
 
 if __name__ == "__main__":
     main()

Footnotes

1. Example taken from https://github.com/chriskiehl/Gooey/issues/608 ↩