[PyQt] Not understanding instanceof() in this situation
sda at fstab.net
Tue Jul 17 17:38:36 BST 2018
I _think_ I see what's going on. You have a file named main.py (you
probably meant `from main import Main`?) which you run directly such as
`venv/bin/python main.py`. When you do this it isn't `main` but rather
`__main__` because you are running it directly and that's what Python
does in that case. When you import the `main.py` file you get another
copy imported under the name `main`. Each is separate including unique
objects being created for the classes defined in `main.py`.
I almost always use entry_points in my setup.py now instead of running
files directly. I also make sure to have an installable project any
time I need to import my own code. Not-installed imports are fiddly...
oh, and work in a virtualenv (basically required on linux), but i
On 2018-07-17 08:45, J Barchan wrote:
> Sorry if this turns out to be a general question about Python's instanceof() rather than specifically PyQt.....
> For debugging leaks (in a simple fashion) I am walking QtWidgets.QApplication.allWidgets() looking at those whose parent() is None.
> I come across one I wish to ignore. PyCharm debugger shows its class as __main__.Main. My code has:
> class Main(QtWidgets.QMainWindow):
> if __name__ == '__main__':
> mainWindow = Main()
> So in my checker I try:
> from main.py import Main
> if isinstance(widget, Main): ...
> But this returns False on the widget. I discovered I can just check instead for isinstance(widget, QtWidgets.QMainWindow), so I'm OK and that's better anyway.
> But I don't understand why it is not an instance of my Main given that is derived from QtWidgets.QMainWindow? Could someone patiently enlighten me?
> PyQt mailing list PyQt at riverbankcomputing.com
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