Category: pyqt5

pyqt5 window

If you do not have PyQT5 installed, you should install it first.
In a terminal you can type:


sudo apt-get install python3-pyqt5

If you are on a Windows or Mac computer, you can download PyQT5 from: https://www.riverbankcomputing.com/software/pyqt/download5

Related courses:

Create GUI Apps with PyQt5

PyQt5 window

You can create a PyQT5 window using the code below:


import sys
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtGui import QIcon

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 simple window - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()
        
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        self.show()
    
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

We set the window size using the setGeometry(left,top,width,height) method. The window title is set using setWindowTitle(title). Finally show() is called to display the window.

Run with:


python3 window.py

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Code

The output should look similar to the screenshot above (depending on your operating system).

pyqt statusbar

PyQt5 supports a window status bar. This is a small bar at the bottom of a window that sometimes appears, it can contain text messages. To add a status bar add the line:


self.statusBar().showMessage('Message in statusbar.')

A statusbar can be added to the main window (QMainWindow). It is one of the methods the class itself contains;

Related course:
Create GUI Apps with PyQt5

PyQt5 statusbar example:
The program below adds a statusbar to a PyQt5 window:


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow
from PyQt5.QtGui import QIcon

class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 status bar example - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        self.statusBar().showMessage('Message in statusbar.')
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

The example creates a window (QMainWindow). We set the screen parameters using:


self.left = 10
self.top = 10
self.width = 640
self.height = 480

Window properties are set in the initUI() method which is called in the constructor. The method:


statusBar().showMessage()

sets the text on the statusbar.

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

pyqt5 signals

Graphical applications (GUI) are event-driven, unlike console or terminal applications. A users action like clicks a button or selecting an item in a list is called an event.

If an event takes place, each PyQt5 widget can emit a signal. A signal does not execute any action, that is done by a slot.

Related course:
Create GUI Apps with PyQt5

Signals and slot introduction
Consider this example:


button.clicked.connect(self.slot_method)

The button click (signal) is connected to the action (slot). In this example, the method slot_method will be called if the signal emits.

This principle of connecting slots methods or function to a widget, applies to all widgets,


widget.signal.connect(slot_method)

or we can explicitly define the signal:


QtCore.QObject.connect(widget, QtCore.SIGNAL(‘signalname’), slot_function)

PyQt supports many type of signals, not just clicks.

Example
We can create a method (slot) that is connected to a widget. A slot is any callable function or method.

On running the application, we can click the button to execute the action (slot).


from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog,
QDialogButtonBox, QFormLayout, QGridLayout, QGroupBox, QHBoxLayout,
QLabel, QLineEdit, QMenu, QMenuBar, QPushButton, QSpinBox, QTextEdit,
QVBoxLayout)

import sys

class Dialog(QDialog):

    def slot_method(self):
        print('slot method called.')
    
    def __init__(self):
        super(Dialog, self).__init__()
        
        button=QPushButton("Click")
        button.clicked.connect(self.slot_method)
        
        mainLayout = QVBoxLayout()
        mainLayout.addWidget(button)
        
        self.setLayout(mainLayout)
        self.setWindowTitle("Button Example - pythonspot.com")

if __name__ == '__main__':
    app = QApplication(sys.argv)
    dialog = Dialog()
    sys.exit(dialog.exec_())

The button is added to a qvboxlayout.

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

pyqt5 messagebox

In this article you will learn how to create a PyQt5 messagebox:

A message box is a class to show a small dialog with an ordinary message, an information message, or a question and it can confirm one or two choices.

A message box can be created using the class QMessageBox. This class provides a modal dialog with a short text, an icon, and buttons. The class has method show() display a message box and return immediately.

To show a messagebox we need to import QMessageBox.


from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox

We use the method QMessageBox.question() to display the messagebox.

Related course: Create GUI Apps with PyQt5

PyQt5 messagebox code
Copy the code below to display a messagebox.


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 messagebox - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 200
        self.initUI()
        
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        buttonReply = QMessageBox.question(self, 'PyQt5 message', "Do you like PyQt5?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
        if buttonReply == QMessageBox.Yes:
            print('Yes clicked.')
        else:
            print('No clicked.')

        self.show()
        
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

More buttons for a messagebox
Take into account we use QMessageBox.Yes and QMessageBox.No. We can easily add other options:


buttonReply = QMessageBox.question(self, 'PyQt5 message', "Do you want to save?", QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel, QMessageBox.Cancel)
print(int(buttonReply))
if buttonReply == QMessageBox.Yes:
    print('Yes clicked.')
if buttonReply == QMessageBox.No:
    print('No clicked.')
if buttonReply == QMessageBox.Cancel:
    print('Cancel')

The available buttons are:

Overview
QMessageBox.Cancel	QMessageBox.Ok	QMessageBox.Help
QMessageBox.Open	QMessageBox.Save	QMessageBox.SaveAll
QMessageBox.Discard	QMessageBox.Close	QMessageBox.Apply
QMessageBox.Reset	QMessageBox.Yes	QMessageBox.YesToAll
QMessageBox.No	QMessageBox.NoToAll	QMessageBox.NoButton
QMessageBox.RestoreDefaults	QMessageBox.Abort	QMessageBox.Retry
QMessageBox.Ignore

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

pyqt5 text box

qwidget set position

pyqt5 menu

pyqt table

In this article you will learn how to use tables with PyQt5. You can add one or more tables to any PyQt application or window.

Tables can have multiple rows and columns. This can be specified with setRowCount() and setColumnCount().

To add a table, you will need to import QTableWidget and QTableWidgetItem.

Related course:

Create GUI Apps with PyQt5

Example


from PyQt5.QtWidgets import QTableWidget,QTableWidgetItem

A table is created with:


self.tableWidget = QTableWidget()

# set row count
self.tableWidget.setRowCount(4)

# set column count
self.tableWidget.setColumnCount(2)

To add individual cells:


self.tableWidget.setItem(X,Y, QTableWidgetItem("TEXT"))

PyQt5 table example
The full PyQt5 table code is below. The table is added to a qvboxlayout. Then a double click is attached to a slot using a pyqtslot.


import sys
from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, QAction, QTableWidget,QTableWidgetItem,QVBoxLayout
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 table - pythonspot.com'
        self.left = 0
        self.top = 0
        self.width = 300
        self.height = 200
        self.initUI()
        
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        self.createTable()

        # Add box layout, add table to box layout and add box layout to widget
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.tableWidget) 
        self.setLayout(self.layout) 

        # Show widget
        self.show()

    def createTable(self):
       # Create table
        self.tableWidget = QTableWidget()
        self.tableWidget.setRowCount(4)
        self.tableWidget.setColumnCount(2)
        self.tableWidget.setItem(0,0, QTableWidgetItem("Cell (1,1)"))
        self.tableWidget.setItem(0,1, QTableWidgetItem("Cell (1,2)"))
        self.tableWidget.setItem(1,0, QTableWidgetItem("Cell (2,1)"))
        self.tableWidget.setItem(1,1, QTableWidgetItem("Cell (2,2)"))
        self.tableWidget.setItem(2,0, QTableWidgetItem("Cell (3,1)"))
        self.tableWidget.setItem(2,1, QTableWidgetItem("Cell (3,2)"))
        self.tableWidget.setItem(3,0, QTableWidgetItem("Cell (4,1)"))
        self.tableWidget.setItem(3,1, QTableWidgetItem("Cell (4,2)"))
        self.tableWidget.move(0,0)

        # table selection change
        self.tableWidget.doubleClicked.connect(self.on_click)

    @pyqtSlot()
    def on_click(self):
        print("\n")
        for currentQTableWidgetItem in self.tableWidget.selectedItems():
            print(currentQTableWidgetItem.row(), currentQTableWidgetItem.column(), currentQTableWidgetItem.text())
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

pyqt tabs

pyqt5 layout

pyqt grid layout

PyQt5 supports a grid layout, which is named QGridLayout. Widgets can be added to a grid in both the horizontal and vertical direction. An example of a grid layout with widgets is shown below:

Related course:

Create GUI Apps with PyQt5

PyQt5 grid layout example:
The example below creates the grid:


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QHBoxLayout, QGroupBox, QDialog, QVBoxLayout, QGridLayout
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QDialog):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 layout - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 100
        self.initUI()
        
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        self.createGridLayout()
        
        windowLayout = QVBoxLayout()
        windowLayout.addWidget(self.horizontalGroupBox)
        self.setLayout(windowLayout)
        
        self.show()
    
    def createGridLayout(self):
        self.horizontalGroupBox = QGroupBox("Grid")
        layout = QGridLayout()
        layout.setColumnStretch(1, 4)
        layout.setColumnStretch(2, 4)
        
        layout.addWidget(QPushButton('1'),0,0)
        layout.addWidget(QPushButton('2'),0,1)
        layout.addWidget(QPushButton('3'),0,2)
        layout.addWidget(QPushButton('4'),1,0)
        layout.addWidget(QPushButton('5'),1,1)
        layout.addWidget(QPushButton('6'),1,2)
        layout.addWidget(QPushButton('7'),2,0)
        layout.addWidget(QPushButton('8'),2,1)
        layout.addWidget(QPushButton('9'),2,2)
        
        self.horizontalGroupBox.setLayout(layout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

Explanation

We import the gridlayout and others with:


from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QHBoxLayout, QGroupBox, QDialog, QVBoxLayout, QGridLayout

In the method createGridLayout() we create the grid with a title and set the size.


def createGridLayout(self):
    self.horizontalGroupBox = QGroupBox("Grid")
    layout = QGridLayout()
    layout.setColumnStretch(1, 4)
    layout.setColumnStretch(2, 4)

Widgets are added using


layout.addWidget(Widget,X,Y)

Finally we set the layout.

Several buttons are added to the grid. To add a button click action you need a pyqtslot.

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

qinputdialog pyqt5

PyQt5 supports several input dialogs, to use them import QInputDialog.


from PyQt5.QtWidgets import QApplication, QWidget, QInputDialog, QLineEdit

An overview of PyQt5 input dialogs:

Related course:

Create GUI Apps with PyQt5

Get integer
Get an integer with QInputDialog.getInt():


def getInteger(self):
    i, okPressed = QInputDialog.getInt(self, "Get integer","Percentage:", 28, 0, 100, 1)
    if okPressed:
        print(i)

Parameters in order: self, window title, label (before input box), default value, minimum, maximum and step size.

Get double
Get a double with QInputDialog.getDouble():


def getDouble(self):
    d, okPressed = QInputDialog.getDouble(self, "Get double","Value:", 10.05, 0, 100, 10)
    if okPressed:
        print(d)

The last parameter (10) is the number of decimals behind the comma.

Get item/choice
Get an item from a dropdown box:


def getChoice(self):
    items = ("Red","Blue","Green")
    item, okPressed = QInputDialog.getItem(self, "Get item","Color:", items, 0, False)
    if okPressed and item:
        print(item)

Get a string
Get a string using QInputDialog.getText()


def getText(self):
    text, okPressed = QInputDialog.getText(self, "Get text","Your name:", QLineEdit.Normal, "")
    if okPressed and text != '':
        print(text)

There are many more widgets (qwidget) and showing dialogs is only one of the things you can do.

Example all PyQt5 input dialogs
Complete example below:


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QInputDialog, QLineEdit
from PyQt5.QtGui import QIcon

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 input dialogs - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        self.getInteger()
        self.getText()
        self.getDouble()
        self.getChoice()
        
        self.show()
        
    def getInteger(self):
        i, okPressed = QInputDialog.getInt(self, "Get integer","Percentage:", 28, 0, 100, 1)
        if okPressed:
            print(i)

    def getDouble(self):
        d, okPressed = QInputDialog.getDouble(self, "Get double","Value:", 10.50, 0, 100, 10)
        if okPressed:
            print( d)
        
    def getChoice(self):
        items = ("Red","Blue","Green")
        item, okPressed = QInputDialog.getItem(self, "Get item","Color:", items, 0, False)
        if okPressed and item:
            print(item)

    def getText(self):
        text, okPressed = QInputDialog.getText(self, "Get text","Your name:", QLineEdit.Normal, "")
        if okPressed and text != '':
            print(text)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

qfiledialog pyqt5

PyQt5 supports (native) file dialogs: open file, open files and save file. By calling the functions included in PyQt5 you get the default file dialog, you don’t have to recreate these dialogs from scratch.

Importing QFileDialog is required.

Related course:

Create GUI Apps with PyQt5

File dialog example
The methods used are QFileDialog.getOpenFileName(), QFileDialog.getOpenFileNames(), QFileDialog.getSaveFileName(). The method parameters let you specify the default directory, filetypes and the default filename.

The code below will show all file dialogs:


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QInputDialog, QLineEdit, QFileDialog
from PyQt5.QtGui import QIcon

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 file dialogs - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        self.openFileNameDialog()
        self.openFileNamesDialog()
        self.saveFileDialog()
        
        self.show()
    
    def openFileNameDialog(self):
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        fileName, _ = QFileDialog.getOpenFileName(self,"QFileDialog.getOpenFileName()", "","All Files (*);;Python Files (*.py)", options=options)
        if fileName:
            print(fileName)
    
    def openFileNamesDialog(self):
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        files, _ = QFileDialog.getOpenFileNames(self,"QFileDialog.getOpenFileNames()", "","All Files (*);;Python Files (*.py)", options=options)
        if files:
            print(files)
    
    def saveFileDialog(self):
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        fileName, _ = QFileDialog.getSaveFileName(self,"QFileDialog.getSaveFileName()","","All Files (*);;Text Files (*.txt)", options=options)
        if fileName:
            print(fileName)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

qpixmap pyqt5

PyQt5 (and Qt) support images by default. In this article we’ll show you how to add an image to a window. An image can be loaded using the QPixmap class.

Related course:

Create GUI Apps with PyQt5

PyQt5 image introduction
Adding an image to a PyQt5 window is as simple as creating a label and adding an image to that label. You can load an image into a QPixmap. A QPixmap can be used to display an image in a PyQt window.

To load an image from a file, you can use the QPixmap.load() method. This will return a True or False value depending on whether the image was successfully loaded.

Once you have loaded an image into a QPixmap, you can then display it by creating a QLabel and setting the pixmap property of the label to the QPixmap.


label = QLabel(self)
pixmap = QPixmap('image.jpeg')
label.setPixmap(pixmap)

# Optional, resize window to image size
self.resize(pixmap.width(),pixmap.height())

These are the required imports:


from PyQt5.QtWidgets import QApplication, QWidget, QLabel
from PyQt5.QtGui import QIcon, QPixmap

PyQt5 load image (QPixmap)

Copy the code below and run it. The image should be in the same directory as your program.


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel
from PyQt5.QtGui import QIcon, QPixmap

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 image - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
    
        # Create widget
        label = QLabel(self)
        pixmap = QPixmap('image.jpeg')
        label.setPixmap(pixmap)
        self.resize(pixmap.width(),pixmap.height())
        
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

pyqt5 qpainter

pyqt color picker

PyQt5 supports a color picker known as QColorDialog. This dialog is a typical dialog that you would see in a paint or graphics program.

To get a color from PyQt5 dialog simply call:


color = QColorDialog.getColor()

A color dialog using PyQt5

Related course:

Create GUI Apps with PyQt5

PyQt5 color dialog example
The example below opens a QColorDialog after clicking the button (qpushbutton), and returns the selected color.


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QColorDialog
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot
from PyQt5.QtGui import QColor

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 color dialog - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 200
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        button = QPushButton('Open color dialog', self)
        button.setToolTip('Opens color dialog')
        button.move(10,10)
        button.clicked.connect(self.on_click)
    
        self.show()

    @pyqtSlot()
    def on_click(self):
        openColorDialog()

    def openColorDialog(self):
        color = QColorDialog.getColor()

        if color.isValid():
            print(color.name())

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

qcolor pyqt5

pyqt drag and drop

Like any modern GUI toolkit, PyQt supports drag and drop. A widget parameter must be set using the setDragEnabled(True) method call. A custom widget should then be set to accept a drop with setAcceptDrops(True).

Drag and drop using PyQt5

Related course:
Create GUI Apps with PyQt5

PyQt5 drag and drop example

Drag text from the input field to the label, the label will update its text. Use pyqtslot to connect the action to a function.


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QLineEdit, QLabel
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 drag and drop - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 60
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        editBox = QLineEdit('Drag this', self)
        editBox.setDragEnabled(True)
        editBox.move(10, 10)
        editBox.resize(100,32)
        
        button = CustomLabel('Drop here.', self)
        button.move(130,15)
        
        self.show()
    
    @pyqtSlot()
    def on_click(self):
        print('PyQt5 button click')
    
class CustomLabel(QLabel):
    
    def __init__(self, title, parent):
        super().__init__(title, parent)
        self.setAcceptDrops(True)

    def dragEnterEvent(self, e):
        if e.mimeData().hasFormat('text/plain'):
            e.accept()
        else:
            e.ignore()
    
    def dropEvent(self, e):
        self.setText(e.mimeData().text())

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

The textbox is created with the call QLineEdit(). A custom class (CustomLabel) is created that accepts drag and drop. Both events are defined as methods and have their logic executed if the event occurs.

Download PyQT5 Examples

pyqt5 font

PyQt5 comes with a font dialog that you may have seen in a text editor. This is the typical dialog where you can select font, font size, font style and so on. Of course the look and feel depends on the operating system.

To open this dialog import QFontDialog call:

QFontDialog.getFont()

To use it, import QFontDialog from QtWidgets like this:

from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QFontDialog

Related course:

Create GUI Apps with Python PyQt5

PyQt5 font dialog

The example below opens a font dialog on a button event, the selected font (font family including size) will be returned as a string.

Font Dialog using PyQt5

Opening a font dialog is as simple as

def openFontDialog(self):
    font, ok = QFontDialog.getFont()
if ok:
    print(font.toString())

Then add a pyqt5 button that opens the dialog. To do that, you need a pyqtslot.

A full code example is shown below


import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QFontDialog
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 font dialog - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 200
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        button = QPushButton('Open PyQt5 Font Dialog', self)
        button.setToolTip('font dialog')
        button.move(50,50)
        button.clicked.connect(self.on_click)
        
        self.show()
    
    @pyqtSlot()
    def on_click(self):
        print('PyQt5 button click')
        openFontDialog()
    
    def openFontDialog(self):
        font, ok = QFontDialog.getFont()
        if ok:
            print(font.toString())
    
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

pyqt5 matplotlib

Matplotlib offers powerful visualizations that can be seamlessly integrated into a PyQt5 application. For this, specific libraries and imports are required.

Here’s how you can include Matplotlib plots within a PyQt5 application:

from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt

The primary component here is a widget named ‘PlotCanvas’ which houses the Matplotlib visualization.

Matplot plot in a PyQt5 window

Integration of Matplotlib with PyQt5
The example provided below illustrates the embedding process of a Matplotlib plot within a PyQt5 window. Additionally, we’ll integrate a qpushbutton for demonstration.

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout, QSizePolicy, QMessageBox, QWidget, QPushButton
from PyQt5.QtGui import QIcon
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
import random

class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.left = 10
        self.top = 10
        self.title = 'PyQt5 and Matplotlib Integration - pythonspot.com'
        self.width = 640
        self.height = 400
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        m = PlotCanvas(self, width=5, height=4)
        m.move(0,0)
        button = QPushButton('Sample PyQt5 Button', self)
        button.setToolTip('This is an illustrative button')
        button.move(500,0)
        button.resize(140,100)
        self.show()

class PlotCanvas(FigureCanvas):

    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        FigureCanvas.__init__(self, fig)
        self.setParent(parent)
        FigureCanvas.setSizePolicy(self, QSizePolicy.Expanding, QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)
        self.plot()

    def plot(self):
        data = [random.random() for i in range(25)]
        ax = self.figure.add_subplot(111)
        ax.plot(data, 'r-')
        ax.set_title('PyQt and Matplotlib Demonstration')
        self.draw()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

For those keen on diving deeper into PyQt5’s capabilities, consider downloading these comprehensive PyQT5 Example Codes.

Navigation:

pyqt5 browser

QWebView class simplified

PyQt5 supports a widget that displays websites named QWebView.

QWebView uses the Webkit rendering engine
The web browser engine is used by Safari, App Store and many OS X applications.

The load() method opens the url (QUrl) in the argument. You can create a QUrl using: QUrl(url).

The show() method is required to display the widget.

Related course:

Create GUI Apps with PyQt5

Installation

To use this widget you may need to install an additional package:


sudo apt-get install python3-pyqt5.qtwebkit

PyQt5 webkit example

The example below loads a webpage in a PyQt5 window.


#!/usr/bin/env python

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtWebKit import *
from PyQt5.QtWebKitWidgets import *
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow

app = QApplication(sys.argv)

web = QWebView()
web.load(QUrl("https://pythonspot.com"))
web.show()

sys.exit(app.exec_())

Webkit in PyQt5

Download PyQT5 Examples

pyqt5 webview

PyQt5 Webkit (QWebview) inside a browser

PyQt5 comes with a webkit webbrowser. Webkit is an open source web browser rendering engine that is used by Apple Safari and others. It was used in the older versions of Google Chrome, they have switched to the Blink rendering engine.

Related course:
Create GUI Apps with PyQt5

QWebView
The widget is called QWebView and webpages (HTML content) can be shown through this widget, local or live from the internet.

Methods
The QWebView class comes with a lot of methods including:

back (self)

forward (self)

load (self, QUrl url)

reload (self)


#!/usr/bin/python

import PyQt5
from PyQt5.QtCore import QUrl
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtWebKitWidgets import QWebView , QWebPage
from PyQt5.QtWebKit import QWebSettings
from PyQt5.QtNetwork import *
import sys
from optparse import OptionParser

class MyBrowser(QWebPage):
    ''' Settings for the browser.'''
    
    def userAgentForUrl(self, url):
        ''' Returns a User Agent that will be seen by the website. '''
return "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36"

class Browser(QWebView):
    def __init__(self):
        # QWebView
        self.view = QWebView.__init__(self)
        #self.view.setPage(MyBrowser())
        self.setWindowTitle('Loading...')
        self.titleChanged.connect(self.adjustTitle)
        #super(Browser).connect(self.ui.webView,QtCore.SIGNAL("titleChanged (const QString&amp;)"), self.adjustTitle)

    def load(self,url):
        self.setUrl(QUrl(url))
    
    def adjustTitle(self):
        self.setWindowTitle(self.title())
    
    def disableJS(self):
        settings = QWebSettings.globalSettings()
        settings.setAttribute(QWebSettings.JavascriptEnabled, False)

app = QApplication(sys.argv)
view = Browser()
view.showMaximized()
view.load("https://pythonspot.com")
app.exec_()

Related course:
Create GUI Apps with PyQt5

pyqt treeview

PyQt can show a directory structure using a QTreeView. For the treeview to show as a directory tree, we need to set its model to a QFileSystemModel instance. That is achieved by calling the setModel method for the tree instance.

We can set additional options on the tree object: sorting enabled (setSortingEnabled), animation and indention.

Related course:

Create GUI Apps with PyQt5

Example
The code below will add the directory view (QTreeView combined with QFileSystemModel) to a grid window. A layout needs to be set for the widget to be seen.

The path is specified using the models setRootPath() method, where the parameter is the full path to the directory. By default its the root.

For layout we use a qvboxlayout.


import sys
from PyQt5.QtWidgets import QApplication, QFileSystemModel, QTreeView, QWidget, QVBoxLayout
from PyQt5.QtGui import QIcon

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 file system view - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        self.model = QFileSystemModel()
        self.model.setRootPath('')
        self.tree = QTreeView()
        self.tree.setModel(self.model)
        
        self.tree.setAnimated(False)
        self.tree.setIndentation(20)
        self.tree.setSortingEnabled(True)
        
        self.tree.setWindowTitle("Dir View")
        self.tree.resize(640, 480)
        
        windowLayout = QVBoxLayout()
        windowLayout.addWidget(self.tree)
        self.setLayout(windowLayout)
        
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

qformlayout

A form can be created using the class QFormLayout. This is the easiest way to create a form where widgets (input) have descriptions (labels).

In this article we’ll show you how to create a form with pyqt.

Related course:

Create GUI Apps with PyQt5

Form Layout Example
The Form Layout is created using the class QFormLayout. We can add rows to the form using the method addRow. The method is defined as


addRow(QWidget * label, QWidget * field)

We call the method using two widgets where the first is the label and the second the type of qwidget.


from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog,
QDialogButtonBox, QFormLayout, QGridLayout, QGroupBox, QHBoxLayout,
QLabel, QLineEdit, QMenu, QMenuBar, QPushButton, QSpinBox, QTextEdit,
QVBoxLayout)

import sys

class Dialog(QDialog):
    NumGridRows = 3
    NumButtons = 4

    def __init__(self):
        super(Dialog, self).__init__()
        self.createFormGroupBox()
        
        buttonBox = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
        buttonBox.accepted.connect(self.accept)
        buttonBox.rejected.connect(self.reject)
        
        mainLayout = QVBoxLayout()
        mainLayout.addWidget(self.formGroupBox)
        mainLayout.addWidget(buttonBox)
        self.setLayout(mainLayout)
        
        self.setWindowTitle("Form Layout - pythonspot.com")
        
    def createFormGroupBox(self):
        self.formGroupBox = QGroupBox("Form layout")
        layout = QFormLayout()
        layout.addRow(QLabel("Name:"), QLineEdit())
        layout.addRow(QLabel("Country:"), QComboBox())
        layout.addRow(QLabel("Age:"), QSpinBox())
        self.formGroupBox.setLayout(layout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    dialog = Dialog()
    sys.exit(dialog.exec_())

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

qboxlayout

python wizard

A wizard is a screen you often see during installations, you have back and next buttons, and are guided through a process.

In PyQt5 these are called pages, every page can have some content. The buttons will guide you through these pages.

Related course:

Create GUI Apps with PyQt5

Wizard Example
The code below creates a wizard in PyQt:


#!/usr/bin/env python

from PyQt5 import QtCore
from PyQt5 import QtGui
from PyQt5.QtCore import pyqtProperty
from PyQt5 import QtCore, QtWidgets

class QIComboBox(QtWidgets.QComboBox):
    def __init__(self,parent=None):
        super(QIComboBox, self).__init__(parent)


class MagicWizard(QtWidgets.QWizard):
    def __init__(self, parent=None):
        super(MagicWizard, self).__init__(parent)
        self.addPage(Page1(self))
        self.addPage(Page2(self))
        self.setWindowTitle("PyQt5 Wizard Example - pythonspot.com")
        self.resize(640,480)

class Page1(QtWidgets.QWizardPage):
    def __init__(self, parent=None):
        super(Page1, self).__init__(parent)
        self.comboBox = QIComboBox(self)
        self.comboBox.addItem("Python","/path/to/filename1")
        self.comboBox.addItem("PyQt5","/path/to/filename2")
        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(self.comboBox)
        self.setLayout(layout)


class Page2(QtWidgets.QWizardPage):
    def __init__(self, parent=None):
        super(Page2, self).__init__(parent)
        self.label1 = QtWidgets.QLabel()
        self.label2 = QtWidgets.QLabel()
        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(self.label1)
        layout.addWidget(self.label2)
        self.setLayout(layout)

    def initializePage(self):
        self.label1.setText("Example text")
        self.label2.setText("Example text")

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    wizard = MagicWizard()
    wizard.show()
    sys.exit(app.exec_())

Screenshot:

For every page you can add a new class, where inside the method initializePage you can set the widgets. Inside the class MagicWizard add or remove pages.

Download PyQT5 Examples