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PyQt5 Tutorial: Create a Python GUI in 2018

build-system.fman.io

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Re: PyQt5 Tutorial: Create a Python GUI in 2018

#51

Post by toyg »

I'm using PyQt for a project right now, and overall it's a nice feeling as always. The model/view classes are great, once you get the hang of them. There are a lot of utilities for things like persistence and threading (but I wouldn't cross the streams with python threads), and it's all crossplatform and very mature by now, the only issues are usually around packaging. QML is also very powerful, but I'm usually happy with Designer -- I guess I'm old-school.

If you need some help with PyQt development, call me up, I'm cheap ;)

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#52

Post by dev_dull »

christophclarke wrote: post #46
int_19h wrote: post #29

Earlier quoted context omitted.

Flexibility to do what, though? I'm genuinely curious: what doesn't Qt offer that a desktop app might need?

I assume learning to build interfaces in Javascript allows you to port that skill to both the desktop environment (via something like Electron) or web environment through a browser.

Exactly this. Javascript frameworks allow overlap. I'm using the same tools and language to create a UI. Don't get me wrong I like QT apps and still tinker with them periodically. I will probably use them more once Go finds a way to make truly portable UI applications.

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#53

Post by solarkraft »

mherrmann wrote: post #31
kelvin0 wrote: post #28

I've been using wxPython for many years, and it works very well. What are the advantages of PyQT over wxPython? Anyone experienced both 'worlds' in a non-trivial application?

The reason why I chose PyQt over wxPython was the former's support for custom styles. I wrote an article with my thoughts on picking a GUI framework [1], in case you're interested. 1: https://fman.io/blog/picking-technologies-for-a-desktop-app-...

I am super happy that you seem so dedicated to providing a good UI library in an attempt to keep people off of Electron (I find one of the biggest hurdles to be the ease of getting started/iteration speed).

Dumb question time: Is this also usable with QML?

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#54

Post by xmcp123 »

mherrmann wrote: post #37
lalos wrote: post #34

Anybody know if it's easy to reverse engineer or strip parts of the application when deploying PyQt5 apps? Or do you need extra measures to obfuscate the code to protect certain logic?

I've never tried it but given Python's interpreted nature, it is likely pretty easy unless you use an obfuscator. Note that that's true for Java .class files as well. I was really surprised once when I tried to decompile one of my own that I had thought would be safe. You get near-perfect accuracy.

This is especially true for Android apk's broken down into .smali files. They can be decompiled and recompiled with ease.

Part of my job used to be the large scale modification and recompilation of Android apps....you'd be amazed how many passwords are floating around in those.

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#55

Post by simion314 »

christophclarke wrote: post #46
int_19h wrote: post #29

Earlier quoted context omitted.

Flexibility to do what, though? I'm genuinely curious: what doesn't Qt offer that a desktop app might need?

I assume learning to build interfaces in Javascript allows you to port that skill to both the desktop environment (via something like Electron) or web environment through a browser.

If only there would be a standard way of doing GUIs in HTML, but if you give the same GUI to be implemented to 10 Web developers you will get really different code, some would write it in HTML and CSS, other would maybe use angular, others would use react or similar, or if the project uses other backend language/frakework you will get different results depending on what PHP,Ruby,.NET,Java framework was used.

In Qt you use the Designer, you need to learn about the layout system if you want to do good UIs, but your GUI is saved in a file and then the c++/python code implements the event handlers and app logic.

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#57

Post by kodablah »

I wish all the effort to make Qt available in Python was going in to exposing a C API. I of course know this is difficult due to Qt relying on OO extensibility in many cases and I am aware of many efforts in many languages that just use the C++ API directly by essentially building their own C API layer.

That I have to choose between C++ or Python makes it very difficult for many use cases in other languages. What essentially ends up happening is you create the UI in C++ then build a communication/bridge layer with your Go/Rust/JVM/etc app via C and the respective language's FFI features.

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#58

Post by solarkraft »

cpburns2009 wrote: post #40
rapsey wrote: post #33

Earlier quoted context omitted.

> Why would I want to switch to Qt? Because GTK is awful outside of Linux.

I'd argue GTK is awful inside of Linux because of client-side decorations (removal of the standard title-bar) that you cannot disable, removal of the menu bar, and the mobile/tablet first design (some people do use desktops and I'm not allergic to text).

> that you cannot disable

I'm pretty sure you can. I like them in most cases, though, just wish they'd gone the Windows/MacOS way of slowly intruding/overlapping a bit occasionally instead of reinventing the whole bar.

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#59

Post by Severian »

mherrmann wrote: post #37
lalos wrote: post #34

Anybody know if it's easy to reverse engineer or strip parts of the application when deploying PyQt5 apps? Or do you need extra measures to obfuscate the code to protect certain logic?

I've never tried it but given Python's interpreted nature, it is likely pretty easy unless you use an obfuscator. Note that that's true for Java .class files as well. I was really surprised once when I tried to decompile one of my own that I had thought would be safe. You get near-perfect accuracy.

If you build the python ecosystem yourself and supply a custom binary, you could probably obfuscate a bit by modifying the compiled bytecode values. Supply only .pyc and maybe modify or not supply the dis module.

Here's a resource that may help: https://devguide.python.org/compiler/#introducing-new-byteco...

Re: PyQt5 Tutorial: Create a Python GUI in 2018

#60

Post by DanFeldman »

solarkraft wrote: post #42
DanFeldman wrote: post #23

We use Qt heavily at Starsky Robotics. We initially used it because it has tight integration with ROS via RQT [1], but I'm pretty impressed with the framework in general. Lots of great tools out of the box, QtCreator is awesome and once you get the right signal/slot model in your head everything is a breeze. Plus getting to prototyping in python is always fast! For our use case, relative speed of the GUI isn't a fact…

Thank you for not using Electron.

All of our end users are internal, so the main bloat-related problems wouldn't really be an issue at all. Why should we be worried about electron in the future?
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