An application I've converted from PyQt to PySide mostly works, but I've run
into some trouble with QSettings()
Most of my development is on Ubuntu and the available version was lagging so I
installed the PPA and got PySide 1.0.5. Contrary to the documentation, pulling
in values does *not* restore the type. I have noticed that 1.0.4 on OSX and
1.0.5 on Windows appear to work correctly. A simple test case is as follows and
illustrates the problem.
First, yes, the fact that a str() object comes back as unicode() is expected.
And I suppose that a tuple being converted to a list is no surprise.
However, on linux running the script a second time loads the stored values
rather than merely passing the values though PySide Qt functions. And this time
bool, int and float are all converted into unicode strings. And the single item
list is no longer a list, but a unicode string as well. And if the code is
naive enough to trust PySide will return it as a list then the string is
faithfully treated as a list -- one character at a time.
On windows a second run loses the bool and float types to unicode, but the int
and list types are preserved.
On OS X, the only platform running 1.0.4, all types are loaded as expected:
strings become unicode strings and tuples become lists. But bool, int, float
and list types are all preserved.
This looks to me like a bug. Perhaps it was introduced in 1.0.5, but even then
the behavior differs between linux and windows. Or is this expected and I'm
misunderstanding the documentation when it says that, unlike PyQt, there is no
need to specify the variable type when restoring values from QSettings?
Tim Doty
----
import PySide
from PySide.QtCore import *
thisApp = 'test'
thisCompany = 'test'
settings = QSettings(thisCompany, thisApp)
someBool = settings.value('SomeBool', True)
someInt = settings.value('SomeInt', 5)
someFloat = settings.value('SomeFloat', 1.3)
someStr = settings.value('SomeStr', 'string')
someUni = settings.value('SomeUni', 'unicode')
someTuple = settings.value('SomeTuple', ('one', 'two'))
someList = settings.value('SomeList', ['three'])
someDict = settings.value('SomeDict', {'key': 'value'})
if not isinstance(someBool, bool):
print "someBool %s is not a bool" % someBool
if not isinstance(someInt, int):
print "someInt %s is not an integer" % someInt
if not isinstance(someFloat, float):
print "someFloat %s is not a float" % someFloat
if not isinstance(someStr, str):
print "someStr %s is not a string" % someStr
if not isinstance(someUni, unicode):
print "someUni %s is not unicode" % someUni
if not isinstance(someTuple, tuple):
print "someTuple %s is not a tuple" % someTuple
if not isinstance(someList, list):
print "someList %s is not a list" % someList
if not isinstance(someDict, dict):
print "someDict %s is not a dictionary" % someDict
settings.setValue('SomeBool', someBool)
settings.setValue('SomeInt', someInt)
settings.setValue('SomeFloat', someFloat)
settings.setValue('SomeStr', someStr)
settings.setValue('SomeUni', someUni)
settings.setValue('SomeTuple', someTuple)
settings.setValue('SomeList', someList)
settings.setValue('SomeDict', someDict)
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