Pyqt how to get QTableWidget item object whose text is empty

Question

I have 3*3 tablewidget,but items' text is empty

self.tab = QtGui.QTableWidget() 
self.tab.setRowCount(3)
self.tab.setColumnCount(3)
self.tab.itemSelectionChanged.connect(self.fuc)

I have a fuction :I click a item ,so I can use QFileDialog to get my file path,then file path is shown in my item .

     def fuc(self):
        itemClicked = self.sender()
        index = self.tab.indexAt(itemClicked.pos())
        filename = QtGui.QFileDialog.getOpenFileName(self, 'OpenFile')
        row = index.row()
        col = index.column()
        self.tab.item(row, col).setText(filename)

But there is an error AttributeError: 'NoneType' object has no attribute 'setText'.I find if item's text is empty ,I can't get item object.The item is None.

you need to use button connect to your function and in your function you need to put check whether there is data or not(You may use `if filename`). — Shubham Namdeo, Mar 03 '17 at 08:54
@ShubhamNamdeo I just started using button connect my function,but now I want to make my UI operate easier.Is there a way I can get item object even without data? — M.Mark, Mar 03 '17 at 09:17

cphlewis · Answer 1 · 2021-10-27T01:09:36.783

It's not just that the item text is empty, it's that the item doesn't even have a text property yet. The short answer is to try/catch (check out all the answers to this question)

def _clickedCell(self, item):
    print(type(item))
    try:
        self.text_label.setText(self.table.item(item.row(), item.column()).text())
    except AttributeError:
        self.text_label.setText('Cell did not have a text property')
    except:
        self.text_label.setText('Something else went wrong')

But something else surprised me - the item passed to the _clickedCell handler is not exactly the QTableWidgetItem defined, even when it is defined. I've added some print debugging right before the same try/catch in the short answer.

Here's a smallish app that sets only some QTableWidget item text values and can display a clicked cell text value, or handle the missing text property:

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QHeaderView, QFrame,\
                        QLabel, QTableWidget, \
                        QTableWidgetItem, QVBoxLayout, QHBoxLayout

class TableWidget(QTableWidget):
    def __init__(self):
        super().__init__(2,2)
        self.setHorizontalHeaderLabels(['Text Set', 'Text Not Set'])
        self.setItem(0, 0,  QTableWidgetItem("dummy text"))
        self.setItem(1, 0,  QTableWidgetItem(""))
        self.horizontalHeader().setSectionResizeMode(QHeaderView.Fixed)





class AppDemo(QWidget):
    def __init__(self):
        super().__init__()

        mainLayout = QHBoxLayout()
        self.table = TableWidget()
        self.table.clicked.connect(self._clickedCell)
        mainLayout.addWidget(self.table)
    
        buttonLayout = QVBoxLayout()

        self.text_label = QLabel('Initialized value')
        self.text_label.setFrameStyle(QFrame.Panel)
        self.text_label.setMinimumWidth(70)
        self.text_label.setWordWrap(True)
        buttonLayout.addWidget(self.text_label)

        mainLayout.addLayout(buttonLayout)
        self.setLayout(mainLayout)

    def _clickedCell(self, item):
        print(item.row(), item.column())
        print(type(item))
        print(type(self.table.item(item.row(), item.column())))
     
        try:
            self.text_label.setText(self.table.item(
                  item.row(), item.column()).text())
        except AttributeError:
            self.text_label.setText('AttributeError: Cell had no text property')
        except:
            self.text_label.setText('Something else went wrong')
        


app = QApplication(sys.argv)
demo = AppDemo()
demo.show()
sys.exit(app.exec_())

# from https://learndataanalysis.org/add-copy-remove-rows-on-a-table-widget-pyqt5-tutorial/

Pyqt how to get QTableWidget item object whose text is empty

1 Answers1