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Qt for Python (PySide/Shiboken)

snapshot for May 2022

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26 May 2022

I

I will give all my love, if someone succeed to change border color of a QCheckbox displayed in a QListWidget ( item.setCheckable.. )

27 May 2022

@

Hello a doubt can I develop commercial systems using pyside6 or do I have to obtain a license

C

For commercial products, you need a commercial license, like you would normally do with qt/c++ applications

F

Cristián 🥑For commercial products, you need a commercial license, like you would normally do with qt/c++ applications

Not if you only use LGPL parts of Qt and follow the LGPL, I think?

I

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They doesn't. PyQt is not maintained and not related to Qt Company

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F

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^

I

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I saw this talk in QtDay in Italy in 2019. I don't know if can apply to Qt6/PySide6 yet. I think yes starting from 6.3 but not sure: https://www.qt.io/licensing/open-source-lgpl-obligations

C

Right forgot that still you can do lgpl commercial apps

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Some Qt modules are only available under GPL, not LGPL: https://doc.qt.io/qt-6/qtmodules.html#gpl-licensed-addons

Well, you could still commercially use it as long as you follow the GPL (i.e. release your source code under the GPL or a compatible license). But then if someone builds and distributes a free version of your application there's not much you can do either.

But for certain things this doesn't matter, e.g. if you mainly sell support/maintenance, or if you're only distributing your tool internally, etc.

F

Then you need to either go LGPL (as long as you still make your copy of Qt open and replaceable), or get a commercial license

Hi Guys.

J

I have following QML code: page1.visible = true; page1.stack = stack; stack.push(page1) - how to run Signal / PySide6 Slot Main.py ?

K

FreyaNot if you only use LGPL parts of Qt and follow the LGPL, I think?

LGPL has provisions that indicate that any code that is statically linked with a library needs to also be licensed LGPL (or maybe LGPL compatible - sharing the sources), but if you link with a piece of LGPL licensed code dynamically, then your code doesn't need to be LGPL licensed... How does that work with Python?

Keith KyzivatLGPL has provisions that indicate that any code that is statically linked with a library needs to also be licensed LGPL (or maybe LGPL compatible - sharing the sources), but if you link with a piece of LGPL licensed code dynamically, then your code doesn't need to be LGPL licensed... How does that

Well surely it's not statically linked... Not a lawyer, but as long as it's possible for users to replace, should be fine

F

Also how does closed-source really work with Python anyways :P

K

FreyaWell surely it's not statically linked... Not a lawyer, but as long as it's possible for users to replace, should be fine

Good points!

Yes, the situation is far from clear, and also for GPL modules that usually are "bounded" in the same c++ executable. For example, what about a QML module (VirtualKeyboard or Charts...) that I use in my application without modification? It is on the filesystem, not linked to my application, just used. Is still forbidden to use in closed source?

I

if in doubt it is probably better not to use it

28 May 2022

hello, i want to adjust icon size of pushbutton dynamically, so i used resizeEvent and i set icon size = button size but in this case the button size gets too big in layout.

def resizeEvent(self, event): min_corner_size = min(self.btnStartSetup.width(), self.btnStartSetup.height()) * 0.9 self.btnStartSetup.setIconSize(QSize(min_corner_size, min_corner_size)) return super().resizeEvent(event)

it works for me

I

i just set icon size smaller than button size

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