PyDoc ValueError: signal only works in main thread

Create file “test.py” with this content:

import pyxel
pyxel.init(160, 120)

Then run pydoc -b from the same directory.

Now navigate to your test module and get the error:

ErrorDuringImport: problem in test - ValueError: signal only works in main thread or with pypy.thread.enable_signals()

I’m new in python so sorry if my issue is noobish, but I have no idea how to provide documentation to my app due to this error.

[bloodywing]

This would work:

import pyxel


class App:
    def __init__(self):
        pyxel.init(160, 120, caption="Hello Pyxel")
        pyxel.image(0).load(0, 0, "assets/pyxel_logo_38x16.png")
        pyxel.run(self.update, self.draw)

    def update(self):
        if pyxel.btnp(pyxel.KEY_Q):
            pyxel.quit()

    def draw(self):
        pyxel.cls(0)
        pyxel.text(55, 41, "Hello, Pyxel!", pyxel.frame_count % 16)
        pyxel.blt(61, 66, 0, 0, 0, 38, 16)

if __name__ == '__main__':
    App()

this prevents creating the object during import too. Usually people don’t import example scripts and simply run them. An exception is things like pydoc, which will scan every directory in a module. It also looks like this behavior changed over time in python:https://bugs.python.org/issue38904

[bloodywing]

put pyxel.init in a function or behind a if __name__ == '__main__' so it won’t call pyxel.init during importing a module

import pyxel


def main():
    pyxel.init(160, 120)
    # ... more pyxel calls here, pyxel.run(...) etc.


if __name__ == '__main__':
    main()