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how to change a window border color in tkinter

I'm having a problem with changing the background of this part of the window:
How do I change it?

As I see you are using windows.
This color is set by the theme you are currently using. It is the same for every window.
So I cross out the possibility of only using the Tkinter module for this.
Tkinter is responsible for what is in the window but the window manager decides about the border. For example in Ubuntu the window would look totally different.
I guess, you would need some windows specific calls for that.
You can remove the border with root.overrideredirect(1) if I remember correctly.
PS: put "windows" into the tags of this question.

How do I create a window like that of CleanMyMac X in tkinter where some parts of the screen are outside the window?

CleanMyMacX image
As you can see, some of the buttons are outside of the window, and the window's title isn't visible. I am wondering if this is possible to do in python tkinter, and if so, how to do it.
Thanks!

opencv window in tkinter frame

I am making a hand controlled media player application in Python and through OpenCV.I want to embed gesture window of OpenCV in Tkinter frame so I can add further attributes to it.
Can someone tell how to embed OpenCV camera window into Tkinter frame?

OpenCV window in Tkinter window is not good idea. Both windows use own mainloop (event loop) which can't work at the same time (or you have to use threading) and don't have contact one with other.
Probably it is easier to get video frame and display in Tkinter window on Label or Canvas. You can use tk.after(miliseconds, function_name) to run periodically function which will update video frame in Tkinter window.

Remove titlebar without overrideredirect() using Tkinter?

I'm currently working with Tkinter and Python 2.7 on Linux and I was wondering if there was a way to remove the TK() window border frame and title bar without using overrideredirect(1).
I have my own close button and overrideredirect(1) presents me with a few issues that I can't accept:
GUI always on top
can't iconify then deiconify properly
no keyboard input so can't type into fields (see python tkinter overrideredirect; cannot receive keystrokes (Linux))
I can't use attributes("-fullscreen", True) as the titlebar and borders remain.

The window decoration is all handled by the window manager so what you are trying to do is find a way to tell the window manager to decorate your window differently from a standard application window. Tk provides overrideredirect to have the window manager completely ignore this window but we can also use Extended Window Manager Hints to declare the intended use of this toplevel window to the window manager. This is done for instance for tooltip and splashscreen windows to allow the manager to provide minimal decoration and possibly special animations.
In your case, adding a 'splash' hint should do what you want
root = tk.Tk()
root.wm_attributes('-type', 'splash')
You will need Tk 8.5 or above for this.

You must give your root window name before your command.
Like this:
from tkinter import *
root=Tk()
root.wm_attributes('-fullscreen','true')
root.mainloop()

Python capture events when console has focus with Tkinter

I'm building a console app, and would like to capture keystrokes in real time. The following code works perfectly until another window gets focus. From that point on, I'm not able to get back to a state where I can capture keystrokes and other events again with only the console visible.
import tkinter as tk
app = tk.Tk()
def handleKeypress(event):
key = event.char
if(key == 'q'):
app.destroy()
else:
print(key)
app.bind_all('<Key>', handleKeypress)
app.withdraw()
app.mainloop()
I've tried using various methods (grab and focus) to redirect the focus to my app. The best I was able to do was to get the Tkinter window visible and in focus with deiconify(), but I was not able to hide it again to make it as though the console is the only window.
Adding the following results in the Tkinter window appearing and disappearing repeatedly:
def lostFocus(event):
app.deiconify()
app.focus_force()
app.withdraw()
app.bind_all('<FocusOut>', lostFocus)
How can I go back to the state the application was in right after launch? Or even better, how can I force it to get all events without having to make the Tkinter window visible and in focus?

You can't do what you want. Tkinter is designed -- as are most GUI toolkits -- to only process events when it has the focus. That's the whole point of focus: for the OS to know where to send events.
The fact that it works initially is probably a bug in tkinter. Though, perhaps it can be explained by the fact that the window initially has focus, and when you withdraw the window the OS doesn't move the focus
The only way to restore focus is to make the window visible.