I have two classes.
The class mask_n_functions controls a form that fills up a SQLite database. There is the method call_inventory_mask which opens a new mask class inventory_function(QDialog, Ui_Inventory):. There I can check some CheckBoxes and fill up a list (InventoryList) with some elements.
Now I want to fill up a QTextEdit of a form which is called with the class mask_n_functions with resulting InventoryListString.
I want to use this for a QGIS Plugin. I use Notepad++ for coding.
I tried self.mask_n_functions.inventory_list.setText(InventoryListString),
UPDATE: There is no python error occurring within QGIS. The QTextEdit field of the mask, called with the class mask_n_functions, still remains empty.
Here is my (reduced) code:
class inventory_function(QDialog, Ui_Inventory): def __init__(self, parent): QDialog.__init__(self, parent) self.setupUi(self) self.get_inv.clicked.connect(self.getInventory) self.close_inv.clicked.connect(self.closeInventory) def getInventory(self): getInventoryList = [['inv1','Example2'],['inv2','Example2'],['inv3','Example3']] InventoryList = [] for l in getInventoryList: checkboxstring = str(l[0]) checkboxname = checkboxstring.strip() checkbox = getattr(self, checkboxname) if checkbox.isChecked(): InventoryList.append(l[1]) InventoryListString = '%s' % ', '.join(map(str, InventoryList)) self.mask_n_functions.inventory_list.setText(InventoryListString) # inventory_list is a QTextEdit() widget of Ui_MainForm in the class mask_n_functions self.close() def closeInventory(self): self.close() class mask_n_functions(QDialog, Ui_MainForm): def __init__(self, parent): QDialog.__init__(self, parent) self.setupUi(self) global now now = datetime.datetime.now() global username username = getpass.getuser() ... self.choose_inventory.clicked.connect(self.call_inventory_mask) def call_inventory_mask(self): inventory_mask = inventory_function(self) inventory_mask.show() 
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