Re: [PyQt] QPyNullVariant
Op Mon, 16 Jul 2012 12:11:11 +0100 Phil Thompson p...@riverbankcomputing.com schreef: On Fri, 13 Jul 2012 15:49:48 +0200, Rodolfo Zitellini xhero...@gmail.com wrote: The offending code is in setup.py, when it reads the language: language = QSettings().value(language, ) print language if not language: try: language = locale.getdefaultlocale()[0] except ValueError: pass if not language: language = C return language in linux, language prints None, on osx it prints QPyNullVariant. it will then evaluate False in if not language and then crash when it arrives in __init__.py. This used to work with qt 4.7 on osx. Just upgrading to 4.8 breaks everything. Any ideas? It would suggest that there is a null QVariant stored in the settings for language. If there was no value stored then would be returned. A workaround would therefore be to update or delete the settings data either manually or with a little script. Phil I'm the author of Frescobaldi. I was not expecting QPyNullVariant() to be returned when I specify a default value. Why is it that bool(the returned QPyNullVariant) defaults to True? What is the best way to check for a possible QPyNullVariant to be returned from the QSettings().value() method? (I.e. it should also work on PyQt-4.7 systems). My code uses QSettings().value almost everywhere. I was happy with the simple interface, although it would be nice if the returned value would be forced in the type of the default value if specified. When I must check for more possible types to be returned, I must create a wrapper function for it, I guess Wilbert -- Wilbert Berendsen (http://www.wilbertberendsen.nl) ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] QPyNullVariant
On Thu, 26 Jul 2012 14:21:57 +0200, Wilbert Berendsen wbs...@xs4all.nl wrote: Op Mon, 16 Jul 2012 12:11:11 +0100 Phil Thompson p...@riverbankcomputing.com schreef: On Fri, 13 Jul 2012 15:49:48 +0200, Rodolfo Zitellini xhero...@gmail.com wrote: The offending code is in setup.py, when it reads the language: language = QSettings().value(language, ) print language if not language: try: language = locale.getdefaultlocale()[0] except ValueError: pass if not language: language = C return language in linux, language prints None, on osx it prints QPyNullVariant. it will then evaluate False in if not language and then crash when it arrives in __init__.py. This used to work with qt 4.7 on osx. Just upgrading to 4.8 breaks everything. Any ideas? It would suggest that there is a null QVariant stored in the settings for language. If there was no value stored then would be returned. A workaround would therefore be to update or delete the settings data either manually or with a little script. Phil I'm the author of Frescobaldi. I was not expecting QPyNullVariant() to be returned when I specify a default value. Why is it that bool(the returned QPyNullVariant) defaults to True? It no longer does... http://www.riverbankcomputing.com/static/Docs/PyQt4/html/incompatibilities.html#pyqt-v4-9-2 What is the best way to check for a possible QPyNullVariant to be returned from the QSettings().value() method? (I.e. it should also work on PyQt-4.7 systems). You will have to do something that explicitly handles the different PyQt versions. The best thing to do would be to ensure you never write a null QVariant to the settings in the first place. My code uses QSettings().value almost everywhere. I was happy with the simple interface, although it would be nice if the returned value would be forced in the type of the default value if specified. Try the optional type keyword argument to QVariant.value(). Unfortunately there was a bug in the PyQt documentation builder that means that section of the documentation that covers this is replaced by the QSettings class reference. You can still read it in the Sphinx sources though. When I must check for more possible types to be returned, I must create a wrapper function for it, I guess Wilbert Phil ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] Model/view: values of type Decimal not shown
Hello,
I don't know how to get numeric data from my model to my GUI, if they
aren't floats but decimal.Decimal. In the following example the last
column of the view and the last QLineEdit of the form both stay empty.
The model data are printed to the console and it can be seen that the
model contains the correct data for the last column and that they have
the right type. But the GUI doesn't show them. What should I change?
Thanks for hints,
Sibylle
# modeltest.py
import sys
import decimal
import datetime
from PyQt4 import QtCore
from PyQt4 import QtGui
RAWDATA = [(1, First, datetime.date(2012, 7, 15), 1.25,
decimal.Decimal(2.5)),
(2, Second, datetime.date(2011, 6, 10), 3.77,
decimal.Decimal(7.54)),
(3, Third, datetime.date(2010, 5, 27), 5.03,
decimal.Decimal(10.06))]
class MyDialog(QtGui.QDialog):
def __init__(self, data, parent=None):
super(MyDialog, self).__init__(parent)
self.myModel = self.setupModel(data)
self.showModelData()
view = self.setupView()
form = self.setupForm()
view.selectionModel().currentRowChanged.connect(
self.mapper.setCurrentModelIndex)
layout = QtGui.QVBoxLayout()
layout.addWidget(view)
layout.addWidget(form)
self.setLayout(layout)
#self.mapper.toFirst()
view.selectRow(0)
def setupModel(self, data):
md = QtGui.QStandardItemModel(len(data), 5)
md.setHorizontalHeaderLabels([Int, String, Date, Float,
Decimal])
for (i, row) in enumerate(data):
# Integer
item = QtGui.QStandardItem()
item.setData(row[0], QtCore.Qt.EditRole)
md.setItem(i, 0, item)
# String
md.setItem(i, 1, QtGui.QStandardItem(row[1]))
item = QtGui.QStandardItem()
# First try: use datetime.date as is. Result:
# Date column in view empty, QDateEdit shows 1.1.2000
# item.setData(row[2], QtCore.Qt.EditRole)
# Second try: convert to QDate via string
dt = QtCore.QDate.fromString(row[2].isoformat(),
QtCore.Qt.ISODate)
item.setData(dt, QtCore.Qt.EditRole)
md.setItem(i, 2, item)
# Float
item = QtGui.QStandardItem()
item.setData(row[3], QtCore.Qt.EditRole)
md.setItem(i, 3, item)
# Decimal
item = QtGui.QStandardItem()
item.setData(row[4], QtCore.Qt.EditRole)
md.setItem(i, 4, item)
return md
def setupView(self):
view = QtGui.QTableView()
view.setModel(self.myModel)
view.setAlternatingRowColors(True)
view.setSelectionMode(QtGui.QTableView.SingleSelection)
view.setSelectionBehavior(QtGui.QTableView.SelectRows)
view.resizeColumnsToContents()
return view
def setupForm(self):
# set up the widgets
intBox = QtGui.QSpinBox()
strEdit = QtGui.QLineEdit()
dateEdit = QtGui.QDateEdit()
floatEdit = QtGui.QLineEdit()
decEdit = QtGui.QLineEdit()
# set up the mapper
self.mapper = QtGui.QDataWidgetMapper(self)
self.mapper.setModel(self.myModel)
self.mapper.addMapping(intBox, 0)
self.mapper.addMapping(strEdit, 1)
self.mapper.addMapping(dateEdit, 2)
self.mapper.addMapping(floatEdit, 3)
self.mapper.addMapping(decEdit, 4)
# set up the layout
form = QtGui.QWidget()
layout = QtGui.QFormLayout()
layout.addRow(Int:, intBox)
layout.addRow(String:, strEdit)
layout.addRow(Date:, dateEdit)
layout.addRow(Float:, floatEdit)
layout.addRow(Decimal:, decEdit)
form.setLayout(layout)
return form
def showModelData(self):
print(--- Model data: ---)
for i in range(self.myModel.rowCount()):
inr = self.myModel.data(self.myModel.index(i, 0))
desc = self.myModel.data(self.myModel.index(i, 1))
day = self.myModel.data(self.myModel.index(i, 2))
fl = self.myModel.data(self.myModel.index(i, 3))
dec = self.myModel.data(self.myModel.index(i, 4))
print({0}: {1} / {2}, {3}, {4} ({5}).format(inr, desc,
day, fl,
dec, type(dec)))
print(--- End of model data ---)
app = QtGui.QApplication(sys.argv)
dia = MyDialog(RAWDATA)
dia.show()
app.exec_()
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