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POAccessing PyQt4 UI elements from other functions referenced from another module
 

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  1. POAccessing PyQt4 UI elements from other functions referenced from another module
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    <p>I'm using PyQt4 using Qt designer. This is the first time I've used it so I'm just getting my head round a few things but this has me stumped. </p> <p>The problem I'm having is that once the UI window has been defined and created, I try to call a function to update a UI element and it produces a "not defined" error. </p> <p>However, if I place the same code in the block of code where the element is initially defined, it works fine.</p> <p>I have written an example below to show what I mean more clearly.</p> <p>The problem is I need to call to update the lcd number from a different module which contains a function that is called when a button is clicked.</p> <p>To show this, I've made a form with an lcdnumber (lcd1) and a pushbutton (button1) in qtdesigner, compiled the code in the file "testui.py", which creates the class "MainWindow".</p> <p>In a.py, I have put:</p> <pre><code>import testui as interface import sys import b from PyQt4 import QtCore, QtGui ui= interface.Ui_MainWindow() def updateui(): for i in range(0, 100): ui.lcd1.setProperty("value", i) if __name__ == "__main__": app = QtGui.QApplication(sys.argv) test = QtGui.QMainWindow() ui.setupUi(test) ui.lcd1.setProperty("value", 1) ui.button1.clicked.connect(b.updatelcd) test.show() app.exec_() </code></pre> <p>This opens the window, and sets the initial state and connects the button to a function in b.py.</p> <p>In b.py, I have put:</p> <pre><code>from a import updateui def updatelcd(): updateui() </code></pre> <p>When I click the button this calls the function in a.py, which leads to the error:</p> <p>"Module has no attribute lcd1"</p> <p>This has been confusing me for a while because ui.lcd1.setProperty works in the <strong>main</strong> loop! </p> <p>It must be something fundamentally wrong with what I'm doing but I can't work it out. </p> <p>Any ideas appreciated</p> <p>Thanks</p>
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    1. COYou are doing circular imports? Why?
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    2. COI have a function in another module which reads data from a serial port. I would like to update the lcd with a value from the serial port on click of the button which, additionally, closes the port; I'm trying to keep the serial interfacing and ui seperate.
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    3. COProblem solved using classes - see below.
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