Master PyQt5 part3: Hand-coding a GUI

Author Alan D Moore demonstrates how to hand-code a PyQt5 GUI using our app template.
Follow Alan at www.alandmoore.com
Purchase a copy of Mastering GUI Programming with Python here: amzn.to/3Dr8cAy
Example code for this video can be found here: github.com/alandmoore/PyQt-Vi...
Previous video in this series where we create the template: • Master PyQt5 part 1: ...
QLineEdit Documentation seen in the video: doc.qt.io/qt-5/qlineedit.html
Thanks for watching!

[@spartacus2993]

After stumbling around hours of other YT channels tutorials, finding this gem of a video actually explaining not just how to do things but most importantly why you would do those things really helped me understand the basics.

[@91F2Z]

Cheap thrills: I find that using QTDesigner to create layouts, widgets, fonts, etc, then copying the pertinent sections into my code (discard the .ui file after copying), greatly speeds up coding GUI's. Also, finding out the syntax, for example hiding the password, can be found quicker by simply doing it in QTD, and then checking the ui code. Good presentation.

[@Factory400]

A bountiful booty indeed! This is by FAR the best presentation of PyQt5 available. It educates the viewer with 'Why' and 'How' while everyone else just says 'type this mysterious code, don't worry why it works' Now I can actually create my own GUI the way I want. Awesome.

[@alandmoorecodes3585]

Awesome! Glad it helped.

[@thatguy6664]

Thank you for teaching us to read the C++ docs and about using enums with the setter methods. PyQt5 makes much more sense now! Everyone: I have the book and it's fantastic. After trying to learn PyQt5 a couple times (videos, books) I am now 100% confident that by the end of the book, I'll be able to build solid, decent looking interfaces. Thanks again!

[@Soljarag5]

You are right.... I AM a smart person!

[@samirasamilan2645]

Great tutorial. As a result, I ordered you book. Thanks.

[@Linuxovert]

Great Job Alan, your tutorials should me taught at schools Man

[@Linuxovert]

should be*

[@NphiniT]

I agree!

[@alejandroayala3615]

Dude you're awesome. Thank you!

[@alandmoorecodes3585]

Thanks!

[@rpdacosta]

This was an awesome series of videos Alan. Well done. I just got your book, may I ask how you can also change the value of your qtw.QTableWidgetItem into a integer in stead of a string? (otherwise it's hard to sort the numbers.)

[@alandmoorecodes3585]

Thanks! A QTableWidgetItem stores its contents as text by default, so one possible approach would be to subclass it to force it to only contain integers. Then use setItemPrototype on the QTableWidget to use your custom class. It's a bit complex to describe here, but if you google "subclass QTableWidgetItem" there are several tutorials out there (alas, many in C++, but that's how it goes with Qt).

[@rpdacosta]

@@alandmoorecodes3585 Ah, appreciate your response Alan, will look into subclassing QtableWidgetItem, thanks for pointing that out. Yeah, I figured this would take some work : ) That's why I believe a tut from you would be unmatched. Might fit right in your series. it's among the best out there on PyQt5 in my view, again great work and I believe I'm speaking for may when saying, thanks for taking the effort to record these and post them.

[@bobbryce8674]

Alan - Thanks so much for the effort invested in the tutorials. I'm here to tell you it was worth it, since I just bought your GUI book! I had an error here that's probably related to my combination of PyQT5 (v5.14.1) and Python 3 (3.8). Apparently its no longer possible to apply a layout directly to the MainWindow as you'll get an error that a layout already exists. For more info, I would refer folks to this response on StackFlow stackoverflow.com/questions/37304684/qwidgetsetlayout-attempting-to-set-qlayout-on-mainwindow-which-already Thanks again Bob

[@alandmoorecodes3585]

You shouldn't apply a layout directly to a QMainWindow. You want to set a central widget instead. The QMainWindow has a layout already to accommodate the menus, status bar, and so on.

[@marcowisse1]

Thanks for a great video! I seem to have one issue though: on my mac the input fields don't expand to match the width of the buttons below; i.e. the 'Login' button protrudes beyond the edges of the input fields above...

[@marcowisse1]

For those of you who tripped over this as well: on a mac you need to set the FieldGrowthPolicy property of the layout to ExpandingFieldsGrow: add this line: layout.setFieldGrowthPolicy(qtw.QFormLayout.ExpandingFieldsGrow) to Alan's code.

[@angel_machariel]

The reason the button wasn't visible the first time is not because you didn't have a layout; That was incidental. The button didn't show because you didn't pass its parent in the constructor. I.e. QPushButton("text", self) .

[@alandmoorecodes3585]

Interesting. I have never bothered explicitly adding the parent since it gets automatically re-parented by the layout object, but it does seem If the parent is specified that the widgets all appear in the upper-left corner of the widget (on top of each other). Thanks for pointing this out.

[@angel_machariel]

@@alandmoorecodes3585 Never too old to learn. I'm beginner at Python myself, coming from C# and C++.