horizontalHeaderItem is None

[Adler]

Hi,

I got _AttributeError: 'NoneType' object has no attribute 'text'_ at line 35 from the code below.

In addition, I tested the index value and it seems to be correct.

Any ideas why i get a NoneType?

from PySide.QtCore import Slot
from PySide import QtGui, QtCore
 
class Output(object):
 
    def __init__(self, physical_type):
        ''' '''
        self.group_box = QtGui.QGroupBox('Output')
        self.layout = QtGui.QVBoxLayout()
        self.layout.addWidget(self.group_box, 1)
 
        self.tabs = QtGui.QTabWidget()
 
    def run(self):
        self.tabs.addTab(self.__genTable(), "None")
 
        form_layout = QtGui.QFormLayout(self.group_box)
        form_layout.addWidget(self.tabs)
 
        return self.layout
 
    def __genTable(self, rows = 4, columns = 2):
        table_view = QtGui.QTableWidget(rows,columns)
 
        table_view.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        table_view.setSelectionBehavior( QtGui.QTableView.SelectItems )
 
        table_view.horizontalHeader().sectionDoubleClicked.connect(self.changeHorizontalHeader)
 
        return table_view
 
 
    def changeHorizontalHeader(self, index):
        model = self.tabs.currentWidget()
        oldHeader = model.horizontalHeaderItem(index).text()
        newHeader, ok = QtGui.QInputDialog.getText(QtGui.QInputDialog(),
                                                   'Change header label for column {}'.format(index),
                                                   'Header:',
                                                   QtGui.QLineEdit.Normal,
                                                   oldHeader)
        if ok:
            self.tabs.currentWidget().setText(newHeader)

from PySide.QtCore import Slot
from PySide import QtGui, QtCore
 
class Output(object):
 
    def __init__(self, physical_type):
        ''' '''
        self.group_box = QtGui.QGroupBox('Output')
        self.layout = QtGui.QVBoxLayout()
        self.layout.addWidget(self.group_box, 1)
 
        self.tabs = QtGui.QTabWidget()
 
    def run(self):
        self.tabs.addTab(self.__genTable(), "None")
 
        form_layout = QtGui.QFormLayout(self.group_box)
        form_layout.addWidget(self.tabs)
 
        return self.layout
 
    def __genTable(self, rows = 4, columns = 2):
        table_view = QtGui.QTableWidget(rows,columns)
 
        table_view.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        table_view.setSelectionBehavior( QtGui.QTableView.SelectItems )
 
        table_view.horizontalHeader().sectionDoubleClicked.connect(self.changeHorizontalHeader)
 
        return table_view
 
 
    def changeHorizontalHeader(self, index):
        model = self.tabs.currentWidget()
        oldHeader = model.horizontalHeaderItem(index).text()
        newHeader, ok = QtGui.QInputDialog.getText(QtGui.QInputDialog(),
                                                   'Change header label for column {}'.format(index),
                                                   'Header:',
                                                   QtGui.QLineEdit.Normal,
                                                   oldHeader)
        if ok:
            self.tabs.currentWidget().setText(newHeader)

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[ChrisW67]

QTableWidget::horizontalHeaderItem() returns the horizontal header item for column, column, if one has been set; otherwise returns 0. 0 is None in Python.

Nothing I see in your code has created header items by, for example, setting header text.

[Adler]

@ChrisW67, your advice solved my problem.

I added:

table_view.setHorizontalHeaderLabels([str(x) for x in range(1, columns + 1)])
table_view.setVerticalHeaderLabels([str(x) for x in range(1, rows + 1)])

table_view.setHorizontalHeaderLabels([str(x) for x in range(1, columns + 1)])
table_view.setVerticalHeaderLabels([str(x) for x in range(1, rows + 1)])

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