signals - w3toppers.com

Why does PySide implicitely create object members from class members for Signals?

They are not copies. If you check the type of those, you’ll see that the class attribute is PySide.QtCore.Signal and the instance attribute is PySide.QtCore.SignalInstance. print “type(obj1.sig): {}”.format(type(obj1.sig)) print “type(obj2.sig): {}”.format(type(obj2.sig)) print “type(Klass.sig): {}”.format(type(Klass.sig)) # type(obj1.sig): <type ‘PySide.QtCore.SignalInstance’> # type(obj2.sig): <type ‘PySide.QtCore.SignalInstance’> # type(Klass.sig): <type ‘PySide.QtCore.Signal’> This is necessary because of the way Qt defines … Read more

Is it possible to capture a Ctrl+C signal (SIGINT) and run a cleanup function, in a “defer” fashion?

You can use the os/signal package to handle incoming signals. Ctrl+C is SIGINT, so you can use this to trap os.Interrupt. c := make(chan os.Signal, 1) signal.Notify(c, os.Interrupt) go func(){ for sig := range c { // sig is a ^C, handle it } }() The manner in which you cause your program to terminate … Read more