在使用py2app构建PySide应用程序包时，QApplication没有在主线程中运行

Question

I am having problems building my PySide Python app using py2app (for OS X). It appears that something funny happens with threads on the app bundle.

Here is the minimal example

from PySide.QtCore import *
from PySide.QtGui import *
import sys

class App(QApplication):
    def __init__(self):
        QApplication.__init__(self, sys.argv, True)

        self.timer = QTimer(self)


if __name__=='__main__':
    app = App()
    app.exec_()

When run from the command line: python test.py , this works fine without error. However when I then compile it with the following setup.py:

from setuptools import setup
import py2app
import PySide

APP = ['test.py']
DATA_FILES = []
OPTIONS = {'argv_emulation': False,
            'includes' : 'PySide',
            'resources' : "qt_menu.nib"
            }

setup(
    app=APP,
    data_files=DATA_FILES,
    options={'py2app': OPTIONS},
    setup_requires=['py2app'],
)

these errors appear in the Console:

11/05/2013 13:54:20.958 [0x0-0xb37b37].org.pythonmac.unspecified.test: QObject: Cannot create children for a parent that is in a different thread.
11/05/2013 13:54:20.958 [0x0-0xb37b37].org.pythonmac.unspecified.test: (Parent is App(0x105f41f10), parent's thread is QThread(0x100106cc0), current thread is QThread(0x10251ea80)

So it appears that App is not being constructed to live in the main thread any more. Any ideas how to fix this?

Answer 1

The problem seems to be the way PySide manage the QThreads. Yo're creating a QTimer with a QApplication as parent. When using PyQt4 that's not as problem, but it might be on PySide.

A QTimer also spawns a QThread so, try run your code without creating the QTimer .

Note: At the time you asked the question, this could be a bug. And might be fixed in the last versions of PySide. (I'm just speculating :D)