I believe your problem is this line: > sys.exit(app.exec_())
Two issues: - It looks like app.exec_() blocks (e.g. http://stackoverflow.com/questions/22289423/how-to-avoid-qt-app-exec-blocking-main-thread ) - When it unblocks, the program sys.exit() terminates ( https://docs.python.org/2/library/sys.html#sys.exit) Thus, your app never reaches any of the twisted code. If you're not familiar with debugging tools that let you walk through the code, adding a print line between each line of actual code would have made it obvious that you never got past this line. Clayton Daley On Fri, Jun 17, 2016 at 11:26 AM, steven meier <commercial...@yahoo.de> wrote: > hi, > > > why does the code below print "testing..." but not "123" 5 seconds after > the application started? > > > > > import sys > from PyQt5 import QtWidgets > from untitled import Ui_MainWindow > #from webchat import get_main_page > > class Main(QtWidgets.QMainWindow): > > def __init__(self): > QtWidgets.QMainWindow.__init__(self) > self.ui = Ui_MainWindow() > self.ui.setupUi(self) > self.setupSignals() > > def button_1_Clicked(self): > self.ui.textbox_2.setText(self.ui.textbox_1.text()) > > def setupSignals(self): > #self.ui.textbox_1.textChanged.connect(self.textbox_1_Changed) > self.ui.button_1.clicked.connect(self.button_1_Clicked) > > > > > if __name__ == '__main__': > #app = QtWidgets.QApplication(sys.argv) > > app = QtWidgets.QApplication(sys.argv) # your code to init QtCore > import qt5reactor > qt5reactor.install() > > print "testing..." > > #get_main_page() > window = Main() > window.show() > sys.exit(app.exec_()) > def printMe(argument): > print argument > > def lala(): > reactor.callLater(5, printMe, '123') > > > lala() > reactor.run() > > > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python@twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python >
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