PyGTK is a Python library for creating graphical user interfaces (GUIs) using the GTK+ toolkit. It is a cross-platform library that can be used to create applications for Linux, Windows, and Mac OS X.

1. Install the PyGTK library:

The first step is to install the PyGTK library. On Linux, you can use your package manager to install it. On Windows and Mac OS X, you can download the pre-built binaries from the PyGTK website.

2. Create a window:

Once the PyGTK library is installed, you can start creating a window. To do this, you need to import the gtk module:

import gtk

Then, create a window object:

window = gtk.Window()

3. Add widgets to the window:

The next step is to add widgets to the window. Widgets are the building blocks of a GUI, and they can be buttons, labels, text boxes, etc. To add a widget to the window, you need to create an instance of the desired widget, and then add it to the window. For example, to create a button and add it to the window, you can do the following:

button = gtk.Button(„Click me!”)
window.add(button)

4. Connect signals and slots:

Signals and slots are a way for widgets to communicate with each other. When a signal is emitted from a widget, any connected slots will be triggered. To connect a signal and a slot, you need to use the connect() method. For example, to connect a “clicked” signal from the button to a slot, you can do the following:

def on_button_clicked(widget):
print(„Button was clicked!”)

button.connect(„clicked”, on_button_clicked)

5. Show the window:

Once all the widgets have been added and signals and slots have been connected, you can show the window:

window.show_all()

6. Run the main loop:

Finally, you need to run the main loop of the application. This will keep the window open until the user closes it:

gtk.main()