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POQWidget: Must construct a QApplication before a QPaintDevice in Python script
 

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  1. POQWidget: Must construct a QApplication before a QPaintDevice in Python script
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    <p>I want to invoke the form below ("First Script") from another script ("the Second Script"), and I want the Second script to populate the label field (presumably using the Qlabel's setText property) with new information. </p> <p>The following 7 lines in the Second Script first produce the original window w/o the label updated; but after I close the non-updated window, a new window appears with the label updated. I don't know why the non-updated window appears first.</p> <pre><code>import Form2use4ques4stackoverflow_2013_02_23_am_09_33_45_ app = QApplication(sys.argv) nuform = Form2use4ques4stackoverflow_2013_02_23_am_09_33_45_.Form() nuform.prefix_label.setText('newtext') nuform.show() #return app.exec_() app.exec_() Marc # -*- coding: latin-1 -*- """ Form2use4ques4stackoverflow_2013_02_23_am_09_33_45_.py """ import sys from PyQt4 import QtCore from PyQt4 import QtGui from PyQt4.QtCore import (Qt, SIGNAL) from PyQt4.QtGui import (QApplication, QDialog, QHBoxLayout, QLabel, QPushButton) class Form(QDialog): def __init__(self, parent=None): super(Form, self).__init__(parent) self.initUI() def initUI(self): okButton01 = QtGui.QPushButton("OK") cancelButton01 = QtGui.QPushButton("Cancel") prefix_label = QtGui.QLabel('Prefix') self. prefix_label = prefix_label hbox_prefix_digit_iterations = QtGui.QHBoxLayout() hbox_prefix_digit_iterations.addWidget(prefix_label) hbox_btnsOK_cancel = QtGui.QHBoxLayout() hbox_btnsOK_cancel.addStretch(1) hbox_btnsOK_cancel.addWidget(okButton01) hbox_btnsOK_cancel.addWidget(cancelButton01) vbox0 = QtGui.QVBoxLayout() vbox0.addLayout(hbox_prefix_digit_iterations) vbox0.addStretch(1) vbox0.addLayout(hbox_btnsOK_cancel) self.setLayout(vbox0) self.setGeometry(300, 300, 600, 300) #class PySide.QtCore.QRectF(left, top, width, height) http://srinikom.github.com/pyside-docs/PySide/QtCore/QRectF.html#PySide.QtCore.QRectF self.setWindowTitle('Duplicate Code Strings W/Increasing Numbers') self.show() def formm(): app = QApplication(sys.argv) form = Form() form.show() app.exec_() if 1 == 1: formm() </code></pre>
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