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mdlg.show()
AttributeError: 'Ui_Dialog' object has no attribute 'show'

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# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'test.ui'
#
# Created: Sun Nov 21 21:17:48 2010
#      by: PyQt4 UI code generator 4.5.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(400, 300)
        self.label = QtGui.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(20, 20, 46, 14))
        self.label.setObjectName("label")
        self.lineEdit = QtGui.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(20, 40, 113, 20))
        self.lineEdit.setObjectName("lineEdit")

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.label.setText(QtGui.QApplication.translate("Dialog", "TextLabel", None, QtGui.QApplication.UnicodeUTF8))

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import sys

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app = QtGui.QApplication(sys.argv)
mdlg = Ui_Dialog()
mdlg.show()
sys.exit(app.exec_())

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# -*- coding: utf-8 -*-

# gex.py

import sys 
from PyQt4 import QtGui 
from gexmaindialog import Ui_Dialog as Dlg

class MeinDialog(QtGui.QDialog, Dlg): 
    def __init__(self): 
        QtGui.QDialog.__init__(self) 
        self.setupUi(self)

app = QtGui.QApplication(sys.argv) 
dialog = MeinDialog() 
dialog.show() 
sys.exit(app.exec_())

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Traceback (most recent call last):
  File "C:\Users\Markus\Pythonprojekte\Gaussian\gex.py", line 7, in <module>
    from gexmaindialog import Ui_Dialog as Dlg
 File "C:\Python26\lib\site-packages\spyderlib\interpreter.py", line 47, in _import
    result = self.builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named gexmaindialog

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# -*- coding: utf-8 -*-

# gex.py

import sys 
from PyQt4 import QtGui 
from gexmaindialog import Ui_Dialog

class MyDialog(QtGui.QDialog, Ui_Dialog):
    def __init__(self):
        super(MyDialog, self).__init__()
        self.setupUi(self)

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    myDialog = MyDialog()
    myDialog.show()
    sys.exit(app.exec_())

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Traceback (most recent call last):
  File "C:\Users\Markus\Pythonprojekte\Gaussian\gex.py", line 7, in <module>
    from gexmaindialog import Ui_Dialog as Dlg
File "C:\Python26\lib\site-packages\spyderlib\interpreter.py", line 47, in _import
    result = self.builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named gexmaindialog