Qt for Python

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  SOLVED 'PySide2.QtCore.Signal' object has no attribute 'emit'
  • tham  

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  Try this: import sys from PySide2.QtCore import QObject, Signal, Slot from PySide2.QtGui import QFont from PySide2.QtWidgets import QApplication, QPushButton class someClass(QObject): someSignal = Signal() def __init__(self): super(someClass, self).__init__() self.someSignal.connect(self.print_msg) try: self.someSignal.emit() except Exception as e: print("__init__:") print(e) @Slot() def print_msg(self): print("lalalu") if __name__ == "__main__": app = QApplication(sys.argv) sc = someClass() button = QPushButton(text="Press me if you want to close the server") button.resize(640, 480) button.setFont(QFont("Arial", 20, QFont.Bold)) button.clicked.connect(button.close) button.show() sys.exit(app.exec_()) Signals have to be class variables to work. You also need to make sure that the __init__ of the QObject is called. This is where pyside does the setup of the signals, trying to use the signal before setup wont work properly. Lastly, make sure you use a Slot decorator on methods you want to connect into the signal system. It will appear to work without the decorator, but you will run into issues with the python class and c++ object lifetimes getting out of sync.
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  UNSOLVED How to use QStandardItemModel in PyQt5 for ListView to show data from a JSON file which contains a list?
  • itskarantyagi  

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  Okay if you are using the correct base Model type all you are needing then is to bring your data into to an object -- be it a defined class you made or some predefined object that handles storing the data within the program Once the data is stored within the program in some manner then the Model can use used to define how the data is to be rendered to the user -- it is the C-V of M-C-V (or Model Controller View or more commonly called MVC for some strange reason). Yes its called a Model but it really is not per their own documentation which makes it a bit more confusing. It just takes your Data Source (Model) and presents it to the View (Gui) so in my book that is the Controller however it is tied fairly tightly to the Gui which is why they say its sort of a combined Controller-View. So with that understanding once you have the data in some internal object -- you give access to the object to your AbstractModel and it selects the data elements it is going to present to the View (Gui) and how those data elements are to be viewed (Bolded, Centered, etc...) Further you can have more than just one of these Models operating off the same Source Data that are used to present different aspects of the data. Now if you need to edit that data that you are displaying then you are supposed to use a Delegate I hope that helps some again drop me a line on Discord DenniO#8137 if you like
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  UNSOLVED Pyside2 fix the location of Qlabel
  pyside2 • • haider  

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  That kind of depends on what you mean by Fix its position ?
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  UNSOLVED Dynamic creation of QObject with Signals and QProperties
  • james2048  

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  Hurrah! I have solved the issue. This is related to people trying to use the signal from the class and not on the instance (through "self"), which is a common pitfall with PySide2, seems like. Now I also fall to it.... I suppose the attributes dict is the "class variable" and not the "instance variable" and as such does not have the methods, I guess they are generated on instantiation. This is beautiful! Fully dynamic class creation. Can't wait to make something with this. I only had to change this part of the create_viewmodel function: def make_getter(name): def getter(self): return getattr(self, "_" + name) return getter def make_setter(name): def setter(self, val): setattr(self, "_" + name, val) # Works!! getattr(self, "_property_changed").emit(name) getattr(self, name + "_changed").emit() return setter
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  UNSOLVED How to add multiple values inside a single cell of pyside2 QTableWidget?
  • haider  

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  Really you cannot do a simple google search such as "pyqt QTableWidget header span columns" Where upon I got the following as my first result of the above Google search PyQT - Group cells in QTableWidget - Stack Overflow And looking at that it appears to answer this very question At least do a little leg work before coming back to ask for more help -- if your not willing to put effort into to it do not expect others to for you
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  UNSOLVED How can I set the value of the textedit box and slider of ui with the value from a config file when it has been created
  • sdf1444  

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  @sdf1444 I do not think you understand how config files should work also you are referencing an *.ini file within your code that you do not supply making that code non-executable that said perhaps this will help you better design what you are doing https://martin-thoma.com/configuration-files-in-python/
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  SOLVED Confirm login dialog and show main windows pyqt5
  • behruz montazeri  

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  @behruz-montazeri I generated the dialog form via designer and it by default makes Dialog capitalized. I am not a Creator user so I did not know that, sorry. Obviously I respect that you stuck with what it gave you. I find it a touch surprising, but there you are. Let's just say that the convention in both C++ & Python is to keep variables having lower-case start while classes have upper-case start, so if you look at examples here and on stackoverflow just be aware that is what you may see.
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  UNSOLVED How to Display a list of dictionatries in listview in qml using pyside2
  python pyside2 qt for python pyside • • luken  

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  That depends on what you are actually trying to put into the ListView -- your List of Dictionaries is a bunch of Dictionary Objects or just the names of those Dictionary Objects?
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  UNSOLVED No module named PyQt5
  python • • a_person  

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  @a_person Find out what it is about your environment that does make it find PyQt5 when from the terminal or wherever (e.g. maybe you have a virtual environment, I don't know), and then compare that environment to the one being used inside Qt Creator at run time which does not locate it?
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  UNSOLVED How do I write the following pyqt5 .ui code as a pyqtconfig file?
  • sdf1444  

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  Okay if you can get on Discord drop me a message and I will give you an invite to you Free Tutoring message server where I am already helping numerous folks with understanding python/pyqt and they are in turn helping some of the others that joined later -- DenniO#8137
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  UNSOLVED Speech Recognition always listen and execute commands
  • behruz montazeri  

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  I am glad it was of help -- but yes when programming never assume things are working the way you would expect them to -- always best to validate (if at all possible) exactly what is being sent and/or received and each step of the way and it greatly helps if you build a project in this manner -- in pieces testing each piece along the way as you put them into place -- this is what led to functional or unit testing of course that is only supported within environments that are geared for it otherwise you have to invent that wheel which is not always necessary -- still some kind integration test is very useful if set up properly to let you know when you make changes that you have not broken something some where else
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  UNSOLVED How to implement a UI for a specific thing
  • sdf1444  

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  @LeLev you can use a lot of different tools to do a lot of different things this individual is using PyQt (or at least mentioned it) and it will do the job quite nicely if implemented properly and it does not take all that long I could probably whip up a mock version of the above in about the same time frame using PyQt and the finished code would be "touchable" rather than the usual untouchable stuff you get from the various designers Well the veritical sliders come predefined with those hash mark values I am not sure that the progress bar does As for whether or not there is a Switch type -- I do not know someone may have already designed one but I have never had a need for such so have not investigated that -- yeah I probably should have add that in my explanation my bad.
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  UNSOLVED How to hide item text and down-arrow of QComboBox ?
  python pyside2 • • ruchitinfushion  

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  @ruchitinfushion okay hopefully all you have to do is replace the reference to PyQt5 with PySide2 but not sure on that one. Regardless if you cannot get this to work straight out of the gate then at least it should point you in the right direction of how to implement what you are trying to implement -- it also gets rid of the unnecessary Designer junk that was there and extends the classification appropriately. Lastly I do not have your images so I simply commented that part out and used straight Text. So hopefully all you will have to do is implement those lines if I read the documentation correctly -- so just comment out the pure Text lines in favor of the Icon/Pixmap related stuff from sys import exit as sysExit from PyQt5.QtCore import Qt, QSize, pyqtSlot from PyQt5.QtGui import QFont, QIcon from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QComboBox, QVBoxLayout, QLabel class CentralPanel(QWidget): def __init__(self, parent): QWidget.__init__(self) self.MyParent = parent # Best just to load these once at start self.pmHigh = QPixmap('E:/code/highStats.png') self.pmMedm = QPixmap('E:/code/mediumStats.png') self.pmLows = QPixmap('E:/code/lowStats.png') self.pmNorm = QPixmap('E:/code/normalStats.png') qgFont = QFont() qgFont.setFamily("SF Pro Display") qgFont.setPointSize(16) qgFont.setWeight(75) qgFont.setBold(True) self.lblIconHldr = QLabel('Hidden Label') self.lblIconHldr.setFont(qgFont) self.lblIconHldr.setAlignment(Qt.AlignHCenter) self.lblIconHldr.hide() self.cbxStats = QComboBox() self.cbxStats.setFont(qgFont) # self.cbxStats.setIconSize(QSize(70, 20)) self.cbxStats.addItem('High') self.cbxStats.addItem('Medium') self.cbxStats.addItem('Low') self.cbxStats.addItem('Normal') # self.cbxStats.addItem(QIcon('E:/code/highStats.png'),'High') # self.cbxStats.addItem(QIcon('E:/code/mediumStats.png'), 'Medium') # self.cbxStats.addItem(QIcon('E:/code/lowStats.png'), 'Low') # self.cbxStats.addItem(QIcon(E:/code/normalStats.png'), 'Normal') self.cbxStats.currentIndexChanged.connect(self.SetIcon) vbxLayout = QVBoxLayout() vbxLayout.addWidget(self.lblIconHldr) vbxLayout.addStretch(1) # The position of this affects how things are rendered vbxLayout.addWidget(self.cbxStats) self.setLayout(vbxLayout) @pyqtSlot(int) def SetIcon(self, Indx): if Indx == 0: self.lblIconHldr.setText('High') # pmImage = self.pmHigh elif Indx == 1: self.lblIconHldr.setText('Medium') # pmImage = self.pmMedm elif Indx == 2: self.lblIconHldr.setText('Low') # pmImage = self.pmLows else: self.lblIconHldr.setText('Normal') # pmImage = self.pmNorm # pmImage.scaled(70, 20, Qt.KeepAspectRatio) # self.lblIconHldr.setPixmap(pmImage) self.cbxStats.hide() self.lblIconHldr.show() class statsMainWindow(QMainWindow): def __init__(self): QMainWindow.__init__(self) self.setWindowTitle('Main Window') self.resize(300, 275) self.CenterPane = CentralPanel(self) self.setCentralWidget(self.CenterPane) if __name__ == '__main__': MainThred = QApplication([]) MainGUI = statsMainWindow() MainGUI.show() sysExit(MainThred.exec_())
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  UNSOLVED Packaging ui files and code into an executable file
  • BlueBreezy  

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  Hi, Are you generating the UI on the fly with the .ui files ?
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  UNSOLVED MacOS: QLineEdit height when changing font-size in stylesheet
  • rmweiss  

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  Okay cannot answer if its a bug or just an undocumented feature ;) but I was experiencing presentation issues on Win10 so its not just related to the Mac OS still I fixed it using too different commands if __name__ == "__main__": GuiThred = QApplication([]) GuiThred.setStyle('fusion') class MainWIndow(QMainWindow): ... self.setStyle(QStyleFactory.create('Cleanlooks')) Of course there are other styles other than Fusion but I also read that some folks feel you ought not to change the style but personally if its not displaying correctly and that fixes the issue frankly I am not so concerned unless the program specs call for the program to allow for various presentation styles because unless it does I am not going to go down that overly extensive path due to the amount of testing that would be required to support that implementation. My motto make it work and once you have a working version then decide if it is worth the effort to implement something more expansive the answer most of the time is no it is not.
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  UNSOLVED Can't View Code in Qt Designer
  • sergioloz  

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  Note to make the transition even easier I have helped and I am continuing to help others move away from the Qt Designer to writing their own PyQt5 interfaces from scratch so if you are having any issues with this or do not know where to best start just give me a holler.
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  UNSOLVED Shrinking pixmap and showing overlay
  • Cinemaster  

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  UNSOLVED Is there a way to manipulate Qmediaplayer frames and display? Or Draw on it with a transparent widget which will not affect the video?
  • codersmurf  

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  UNSOLVED QWebEngineView: PySide2 5.13.x, OpenGl Buffer error when freezing with pyinstaller
  • Dagginio  

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  SOLVED Slot with extra argument
  • GF GEPI  

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  @denni-0 I think I have found the way to factorize my code, using lamdba to give an extra argument. s1 = Signal(bool) s2 = Signal(bool) ... s1.connect(lambda flag: test(flag, w1)) s2.connect(lambda flag: test(flag, w2)) ... def test(flag, wg): if flag: wg.setTooltip('OK') else: wg.setToolTip('Not OK') Note that it works: with or without the @Slot(bool) decorator with an user-defined signal s_user = Signal(bool) or a built-in signal such as stateChanged As stated here, this may be generalized with: obj.signal.connect(lambda p1, ... , arg1=val1, ... : fun(p1, ... , arg1, ... )) ... def fun(p1, ... , arg1, ... ): [...]
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  UNSOLVED When Use @Slot(), sender has NoneType.
  • klyjm  

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  Okay to use a @Slot() you need to use a Signal. The connect you are using is not an in code Signal as you have not defined it as such that is just a standard connect that connects your function to a system Signal which seems to be handled differently. Yeah sort of the same thing but not the same thing. This is a basic in code Signal/Slot definition where the MySignal is defined within the Class and used where the Class is instantiated and that is also where the Slot would be defined MySignal = Signal() self.Class.MySignal.connect(self.select_leg) @Slot() def select_leg(self): pass This is how you would declare a standard Button and I assume a Radio Button is pretty much the same self.btnLeft = QPushButton('Left') self.btnLeft.clicked.connect(self.select_leg) def select_leg(): pass Again while similar they are not the same. I have never had to add a Slot decorator to a function associated with a connect to a predefined object that uses event signals in fact doing so has always caused an error but I have always had to use the Slot decorator when it is associated with a custom in my code defined signal. You can either accept that or continue to struggle with trying to add that @Slot decorator to your function. Of course I am no Guru when it comes to PyQt by any measure (and have never used PySide2) but so far I have seen nothing that contradicts what I have just shown you. If you do find something let me know and I will take a look. Just keep in mind their documentation is not always spot on.
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  UNSOLVED Sender always is null(Invalid Signal signature: textMessageReceived(str))
  • tham  

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  Okay removing @Slot() means you are not using Signal/Slots and will be making a direct function call. The question I pose is what are you trying to implement with your version of this as I realize this is just an MRE of problem you are experiencing. As a reference without seeing the rest I am going to guess you might be confusing things. Sockets are different than Signal/Slots as Sockets are mainly for internet communication and Signal/Slots are for internal code communication mainly between Threads. So are you attempting internet communication or internal (to the application) code communication? If the latter then I can help you sort out how to properly use Signal/Slots if the former I will have to pass as I have not delved into Sockets yet.
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  SOLVED Why does instantiating QPixmap in a second thread block/slow main?
  • nobru  

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  Okay in order to speed things up you are now going to have to enter the land of multiprocessing which will mean not only learning and understanding multiprocessing but how to use QThreads to facilitate communication between your two processes. After you have dug into multiprocessing and how to implement it and have a basic understanding post another question with any questions you have on that and I will help you with any issues you might be having -- just finished going through that pain myself and finally have 2 Processes, 6 Threads, and 2 Pipes function properly and that is just for one application.
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  SOLVED How to show a Tab (QWidget object) embedded in a QtWidget on button click?
  qt for python • • Famien  

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  With your description I would strongly suggest then doing away with the Tabs all together and use a Stackable Widget basically think an array of views or turning your tabs into an array and only showing the contents of the tab rather than showing the tab at all. If you need help on how to change this into a stackable widget just ask but give it a try first you will learn more from trying it than you will from being spoon fed ;)
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  UNSOLVED How to make QTreeView/QListView display specific folders?
  • Jackkkkk  

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  You right a function like the following: def SetContent(self, tmpItmList): self.model.setRowCount(0) idx = 0 for Item in tmpItmList: # Required to avoid getting a duplicate data insert message idx += 1 blnkVal = QStandardItem(str(idx)) ItmNam = QStandardItem(Item['ItemName']) ItmNam.setTextAlignment(Qt.AlignLeft) ItmNam.isEditable = False ItmVal = QStandardItem(Item['Value']) ItmVal.setTextAlignment(Qt.AlignCenter) ItmUnt = QStandardItem((Item['Units'])) ItmUnt.setTextAlignment(Qt.AlignLeft) ItmUnt.isEditable = False self.model.appendRow([blnkVal, ItmNam, ItmVal, ItmUnt]) The above is a method within my QTreeView class that I use for the ListView on the right side -- your version would be dependent on how you ended up storing your data further the left QTreeView would have parents and children so that would have to be coded differently. I have a version of that as well but could not find it quickly and figured with this you ought to be able to figure out how to implement the parent/child version of QTreeView by referencing the documentation and perhaps other posted examples out on the web as that was how I figured it out.
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  UNSOLVED Snippets for Python
  • alaabarazi  

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  You want to run "Python-Code" in Qt? Did I understand this correctly ?
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  UNSOLVED QWebEngine and Proprietary Codecs
  • WeedMan  

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  UNSOLVED Don't work look-and-feel
  • WeedMan  

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  I have Qt/PyQt 5.11 installed from repositories. I run QFileDiaolg from pure Qt app and PyQt5 and now looks as it should I guess if Qt build for your system then should not be problem, else may be roughness with looks and fills (post above) Qt app from example: PyQt5 app: Maybe there is still some way to give the program the current system style or is it set only at compile time Qt for OS?
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  UNSOLVED Change Default Python Interpreter
  • alaabarazi  

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  SOLVED Adjusting the height of rows in QTableView
  • 3beezer  

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  Apparently, one needs to explicitly request a resize, e.g., with view.resizeColumnToContents(0) after the setItemDelegatestatement. It seems to me that the delegate would be invoked when sizing the view initially, but evidently this expectation is wrong. Also, it appears that __getattr__ does not work in PySide2.
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  UNSOLVED Qt Virtual Keyboard bug in Lubuntu
  • peaceblackhair  

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  UNSOLVED Pycharm and Eclipse on windows don't show error information for PyQt5
  • behruz montazeri  

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  UNSOLVED creating an .bmp file
  • AJ_111  

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  where do you link your painter to the image? I see rectangle bounds checking of img, but nothing making the painter paint into the image itself.
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  UNSOLVED How to customize QSortFilterProxyModel to display specific folders?
  • Jackkkkk  

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  @daljit97 Qt.DisplayRole result: DISK NAME (F:) DISK NAME (C:) DISK NAME (D:) DISK NAME (F:) ... QFileSystemModel.FileNameRole result (no disk name): F: C: D: F: ... the result shows a list of all disks (which is the top level of the file system), indicating QSortFilterProxyModel.filterAcceptsRow() used an invalid index. look at the last test in my code.
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  UNSOLVED Problem with For "str" in str["str"]
  • Tarik EL JABIRI  

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  @tarik-el-jabiri here is a non-coded rendition of a method to deal with this issue -- it might not be the best and then again it might just be -- it is basically I would at least initially handle this situation. First I would convert myList into myDict arranged as follows: Key = 'LOT_1' Value = 'T49359/22' or in Dictionary nomenclature {'LOT_1':'T49359/22' ... } Next instead of working with the raw Folder Names run them through a preprocessor so that you can apply your business rules to that folder (aka business rules such as LOT_1 <> LOT_10, etc...) Then Pass the foldername into your preprocessor routine and have that routine return a Key:Value where: Key = 'LOT_???' Value = 'Full_Folder_Path_Name' Then you can do something as easy as for FolderKey in ReturnedValue: if FolderKey in myDict.keys(): FolderValue = ReturnedValue[FolderKey] Now you have the two values you are looking for already separated As for the Preprocessor Routine you are going to have to basically search for 'LOT_' and then because your number can be up to 3 digits grab the next 3 characters and determine what number you actually have discarding anything that is not a number. Numerous ways to do this for instance you could try to convert each character to a number and add them together such as: if isnumeric(String[0]): digit = int(String[0] if isnumeric(String[1]): digit = (digit * 10) + int(String[1] if isnumeric(String[2]): digit = (digit * 10) + int(String[2] NewValue = 'LOT_' + str(digit) I nested these because if you run into a non-integer followed by an integer you do not get the wrong end result
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  UNSOLVED Object Handles across QThread Boundaries
  • Denni 0  

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  Right but if Thread Safety is the only concerns then certain direct simplistic calls that get in adjust a flag and immediately get out ought not to create any issues especially if those kind of calls are mono-directional coming from one source and going to one destination with no cross-overs to any other threads basically in format I have a Main-Thread that talks to two child threads and these child-threads talk only to the Main-Thread sometimes setting certain flags and/or values is more easily done via a direct call while passing the more complex data is done via signal/slots --- and I want to be sure that doing this would not cause any hidden issues when it comes to how Threads work. I actually understand the under working mechanisms that might have been applied to threading (having actually written something like this in the past) but I am just not sure what methodology they implemented in doing this exactly. As for your RTFC -- sure I could -- like the masses -- not question how things work but frankly that is not my style and never has been -- and I have a lot of bugs in code because of my approach so I think I will keep it and not go with the rest of the lemmings as they plummet over that cliff ;) -- secondly I do not have the time to dig into the actual complete functionality of that code otherwise I probably would and I am just trying to find out if anyone else has already invented that wheel so I do not have to repeat making it. Its kind of like making modular code, I make it that way so I do not have to repeat making it for another project that needs something similar.
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  UNSOLVED Left sidebar like category
  • Emrecp  

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  Solved with QListWidget self.listWidget = QtWidgets.QListWidget(self.tab_5) self.listWidget.setGeometry(QtCore.QRect(10, 90, 171, 211)) self.listWidget.setStyleSheet("QListWidget {background-color: #363636}\n" "\n" "QListWidget::item {\n" "background-color: rgb(54, 54, 54);\n" "height: 40px;\n" "color: white;\n" "padding-left:15px;\n" "}\n" "\n" "QListWidget::item:hover {\n" "background-color: rgb(255, 255, 255);\n" "height: 40px;\n" "color: #363636;\n" "padding-left:15px;}") self.listWidget.setFrameShape(QtWidgets.QFrame.NoFrame) self.listWidget.setObjectName("listWidget")
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  UNSOLVED How do I addApplicationFont() in MacOS? Font is in Python script folder...
  • chmedlymedly  

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  @daljit97 Aha, the path is the issue. So, I find that using daljit97's approach does allow the font to be loaded in MacOS. But it fails on Linux. :( This means I need to parse this according to platform. fontbase = QtGui.QFontDatabase() test = fontbase.addApplicationFont(os.path.dirname(__file__) + "/MySillyFont.ttf") font = QtGui.QFont("MySillyFont", 12) app.setFont(font) And, on MacOS I'm able to load the font at start but the font dialog box does not show it. I'm still missing something simple here. It's not clear to me... How should my fontDialog know about the database I created? For that matter, how does the app know about the database at the very beginning? It somehow finds the font in the above code but doesn't find the font in my Fonty function. def Fonty(): ok, font = QtWidgets.QFontDialog.getFont() print(f"font selected is {font}") if ok: app.setFont(font)
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  UNSOLVED PyQt5 How to get data from current row of QTableView
  • behruz montazeri  

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  @denni-0 index = self.tableView.currentIndex() NewIndex = self.tableView.model().index(index.row(), 0) I must write index.row() with parenthesis. Now it works.Thanks
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  UNSOLVED QPyDesignerCustomWidgetPlugin trouble with propertyEditor
  • dzukenukem  

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  You need to provide a MRE (Minimal Reproducible Example). What you have provided cannot be copy/pasted and ran which means anyone trying to figure out your issue is going to have to create code of their own which may not match what you are doing thus they may not get the issue you are having. Do yourself a favor and provide an MRE so that someone can answer your question quicker and more accurately