Qt is a robust cross-platform framework that works on Windows, Linux, Mac, Android, and more. It allows you to create GUI applications as well as provides libraries for networking. In this tutorial, we will focus on some of the very core aspects of using PyQt5 and how to package it for distribution.
You need the pyqt5 package for Python and Qt Designer. You can get both of these by running:. These packages will also provide pyuic5 for converting Designer files to Python files.
It also includes many other utilities like qdbusqdocqmlscenelinguistand more. If you are using Linux or a system that doesn't have the packages for pyqt5-tools you can usually find the Designer and other apps in your system's package repositories.
For example, in Fedora there is a package named qt5-designer. You can test your installation by attempting to run the Hello World application in the next section. You can get the local documentation on your computer by running the pydoc server and visiting it in your browser. Here is a simple example that demonstrates how to initialize a PyQt5 application. It also includes a simple window with nothing in it. A window is not technically required for a PyQt5 application, but generally the primary reason Qt is used is to create GUI windows.
In Windows, you can use the. Using the Designer is optional, but it can be a very helpful way to layout interfaces. I highly recommend using the Designer. Once you have created a. The next sections will cover both options. From the terminal, you can convert a QtDesigner. This method works fine, however it becomes difficult to iterate rapidly on changes with this extra step. You also cannot modify the. I recommend using the method in the next section, where you load the.
The Python file output will have all the code needed to recreate the interface created in Designer. My preferred option for loading interfaces, is to the load the. This means you will need to include the.
Signals are a critical concept to understand when using the Qt framework. Signals and events are similar to channels in Go. Every signal you create must have a data type associated with it.
Making a PyQt5 Calculator
The signal can then emit events that contain data of that type. For example, if you create a string signal, you can emit strings to anyone listening for the events. You can create an integer signal that spits out integers to listeners. Signals are thread safe. Alternatively, you can use a decorator pyqtSlot. Some widgets come with signals already.
For example, a button comes with a clicked signal that can be connected. The next section on threading will provide a working example of how to create a custom signal, connect it to a callback function, and emit events. To use QThreads, you can create a subclass of QThread. Be sure to call the parent class constructor, and create any signals that will be used to pass data.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. The PyQt5 wheels do not provide tools such as Qt Designer that were included in the old binary installers. This package aims to provide those in a separate package which is useful for developers while the official PyQt5 wheels stay focused on fulfilling the dependencies of PyQt5 applications.
You will generally install pyqt5-tools using pip install. In most cases you should be using virtualenv or venv to create isolated environments to install your dependencies in. The above command assumes an env in the directory yourenv. The --pre allows for the latest version to be installed despite not being a full release version.
You will have to decide if this is a good option for you at any given point in time. If you are using a different PyQt5 version, specify it instead of 5. PyPI keeps a list of all available versions. Each one searches up the filesystem tree from your current working directory to find a.
With this extra variable you can specify paths relative to the. These examples are not intended to be used as examples of good code. Unknown arguments are passed through to the original Qt Designer program.
In addition to the standard features of the official Designer plugin, this provides an exception dialog for your widget's Python code. Otherwise Designer in Windows silently crashes on Python exceptions.
What is PyQt?
The QML plugin is also included. In the future a tool may be provided to handle copying of the plugin to each directory where it is needed.
For now this must be done manually. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. No description, website, or topics provided. Python QML. Python In the Login class instead of only login button, i have added two text box for username and password then i want to go to another window when i will click on login button but when i click on login button it gets exit from program.
How can I make the same thinf but with multiple windows? Like a game menu and every button opens a different window.??? Hello My name is Soumil Shah I am making a project with PyQt5 and Stuck on Changing pages the problem is i am able to switch from page one to page two when i go back when i use hide method it gives me error can you help me i am trying to implement your login in my code but due to some error i am not able to do that here is my code.
QApplication sys. There are quite a few problems here. The code, as you posted it, would not run at all for me, so I cannot see exactly where you are getting an error. I changed it in the following way:. As you can see, I have taken the classes generated via the pyuic tool and made other classes that inherit from both QWidget and the auto generated classes. These new classes are the ones where the GUI programming should be done. You should not add additional code to the files generated by pyuic because if you were to change your UI with Qt Designer and run pyuic again, all of the code you added would be overwritten.
I have commented out the portions of the generated classes that I believe you added so they do not affect the new classes. The only other change I made here is in the pyqtSignal. In my example these signals emitted a string, but only to demonstrate how to pass information from one window to another.
It appears that you were trying to emit these signals without supplying them with a string. This is the only area I found that caused an error. You did however say that the error occurred when you called the hide method, but you do not call that method anywhere in the code you posted.
I want to say thanks to you for taking out time and reading my code and helping me out a very handful of programmers do that. Skip to content. Instantly share code, notes, and snippets. Code Revisions 4 Stars 26 Forks 5. Embed What would you like to do? Embed Embed this gist in your website.The first thing to do when using PyQt5 is to import all the different modules as well as the sys module.
This is done like so:. We must then create a class that takes the QMainWindow argument as a parameter and initialise the MainWindow within a subroutine in the class. This subroutine contains all of the setup for the user interface, including:. This must be done inside the initUI function. What this code does is it calls the QLineEdit function which is part of the PyQt5 library and then does a number of things:.
Each of these buttons is made in the same fashion. The QPushButton function is initialised as a variable. It is then moved to the correct location on the screen, and then the button is resized.
Some of the buttons shown above have also been connected to various subroutines. At the moment, the buttons look pretty boring however, one cool feature of PyQt is that you can use CSS stylings to style some objects. The code above creates three lists containing all the variables of the buttons initialised earlier and then loops through each list, adding CSS stylings to each and connecting the buttons to a subroutine if need be. Finally, we must set the window size and title, as well as make sure that the window is shown.
This can be seen in the code below. Now you may be trying to run your code to see what the calculator looks like, however your still missing one small piece of code. This code must be added outside and below the class. In this program we will be using a couple of variables as global variables throughout. Therefore, we must initialise these variables at the start of the program, outside of the class. The first function we are going to create is the Num function.
This function allows us to enter numbers into the calculator and see them displayed on the screen. First, we need to call all the variables as global variables. Then, we use the self. We then set the variable setNum to the number entered but first make sure that the number has been converted to a string so that it can be displayed in the LineEdit.
You may also notice the opVarthis variable ensures that each number clicked on makes up part of the current number unless and operator has been pressed beforehand.Create Python GUI Application using PyQt5 Designer with Python 3.6.3
This next function is connected to all the operators. The sumIt variable checks if there is more than one operator already pressed and if there is, it will print the sumso that it is easier for users to see the total sum of their current calculation. The function then sets the variable num to whaterver number is currently in the LineEdit and sets the operator to whichever operator the user has just pressed.
It also sets opVar to True so that the next numbers added are individual seen as a new number. The point function checks if there is a point in the current number and if there is not a point, it will add the point to the current number.Released: Apr 3, Python bindings for the Qt cross platform application toolkit.
View statistics for this project via Libraries. Author: Riverbank Computing Limited. These include location and positioning services, multimedia, NFC and Bluetooth connectivity, a Chromium based web browser, as well as traditional UI development.
PyQt5 is a comprehensive set of Python bindings for Qt v5. PyQt5 is copyright c Riverbank Computing Limited. PyQt5 is released under the GPL v3 license and under a commercial license that allows for the development of proprietary applications. The documentation for the latest release can be found here. The sip-install tool will also install the bindings from the sdist package but will allow you to configure many aspects of the installation.
Apr 3, Jan 6, Dec 19, Nov 3, Sep 13, Jul 5, Jun 26, May 6, Mar 19, Feb 10, Oct 3, Jul 2, Feb 27, Jan 23, Nov 24, Nov 2, Jul 4, Mar 30, Mar 7, Feb 15, Dec 29, Jul 25, Apr 28, PyQt5 supports Qt v5. PyQt4 supports Qt v4 and will build against Qt v5. The bindings are implemented as a set of Python modules and contain over 1, classes.
PyQt4 and Qt v4 are no longer supported and no new releases will be made. PyQt5 and Qt v5 are strongly recommended for all new development. You can purchase the commercial version of PyQt here. More information about licensing can be found in the License FAQ.
PyQt does not include a copy of Qt.
You must obtain a correctly licensed copy of Qt yourself. Qt is more than a GUI toolkit. Qt also includes Qt Designer, a graphical user interface designer. PyQt is able to generate Python code from Qt Designer. Python is a simple but powerful object-orientated language.
Its simplicity makes it easy to learn, but its power means that large and complex applications can be created. Much of Python's power comes from its comprehensive set of extension modules providing a wide variety of functions including HTTP servers, XML parsers, database access, data compression tools and, of course, graphical user interfaces.
Used in this way, Python can then become the glue to create new applications from established libraries. PyQt combines all the advantages of Qt and Python. A programmer has all the power of Qt, but is able to exploit it with the simplicity of Python. For more details, including some simple programming examples, you can download a copy of the PyQt Whitepaper.
PyQt-builder v1. Contact Riverbank at info riverbankcomputing. What is PyQt?
Why PyQt? Recent news pyqtdeploy v2.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. These PyQt examples show you how to create a desktop app with Python and Qt. Start with "Hello World" or browse the official PyQt demos.
You can run every example yourself on Windows, Mac or Linux. All you need is Python 3. For instructions, please see below. The PyQt source archive also contains a large number of sample files. The easiest way to start them is to follow the instructions about running examples below, then execute the following commands:. You can use it to easily browse and run the official demo applications.
The following examples are quite nice for instance:. Running the examples is really easy. The only thing you need is Python 3. First, download the ZIP archive of this repository and unpack it. Open a command prompt and use cd to navigate into the top-level directory of the archive. It will contain the necessary libraries for running the examples. For example:. You'll find a. You can run it with the command:. This repository uses PyQt5 to use Qt from Python. Another, alternative binding is PySide2 also called "Qt for Python".
It is less mature than PyQt5 but has the advantage that you can use it for free in commercial projects. If you want to use PySide2 instead of PyQt5, simply replace all mentions of the latter by the former. Similarly for any code examples: from PyQt5. Alternatively, if you don't want to commit to either of the two bindings at this stage, you can also use Qt. This is an abstraction over PySide2 and PyQt5. It loads whichever of the two bindings is available. To use it for the examples presented here, replace all mentions of PyQt5 by just Qt.