tkinter python maximize window

Question

You can do it by calling

root.state('zoomed')

If you want to set the fullscreen attribute to True, it is as easy as:

root = Tk()
root.attributes('-fullscreen', True)

However, it doesn't show the title bar. If you want to keep it visible, you can resize the Tk element with the geometry() method:

root = Tk()
w, h = root.winfo_screenwidth(), root.winfo_screenheight()
root.geometry("%dx%d+0+0" % (w, h))

With winfo_width() and winfo_height() you can get the width and height or the window, and also you can bind an event handler to the <Configure> event:

def resize(event):
    print("New size is: {}x{}".format(event.width, event.height))

root.bind("<Configure>", resize)

To show maximized window with title bar use the 'zoomed' attribute

root = Tk()
root.attributes('-zoomed', True)

I've found this on other website:

    import Tkinter

    MyRoot = Tkinter.Tk()
    MyRoot.state("zoomed")

    MyRoot.mainloop()

This solved my problem.

The first approach is to use the root.state('zoomed'), but is not supposed to be universally available. It works on Windows, and on my Ubuntu machine. However, under my Arch machine it doesn't.

---

The second is to first get the maxsize, and then set geometry manually, like:

m = root.maxsize()
root.geometry('{}x{}+0+0'.format(*m))

This works on most machines, but not on all. For example, under my Arch the maxsize() returns (1425, 870), while the real geometry of maximized window should be (1440, 848). So, you also couldn't rely on it.

---

And the third, in my opinion the best approach is to use root.wm_attributes('-zoomed', 1). It is universally available and seems to be the safest. On some machines in could zoom only by width or by height, but comparing to previous method, this one would never give you a window partly ouside of the screen.

Finally, if you want a fullscreen, not just zoomed window, use root.wm_attributes('-fullscreen', 1). It provides a native link to window manager's behavior, thus working much better, than playing with overrideredirect and setting geometry by hand (which on some platforms could lead to unmanaged window, which could be closed only by its own interface or killing the process, won't show on the taskbar, etc...)