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You can use the tkinter library in Python to position windows. Here is an example code that positions a window at the center of the screen:

import tkinter as tk

root = tk.Tk()

# get screen width and height
screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()

# calculate x and y position for the window
x = (screen_width/2) - (300/2) # width of the window = 300
y = (screen_height/2) - (200/2) # height of the window = 200

# set the position of the window
root.geometry('%dx%d+%d+%d' % (300, 200, x, y))

root.mainloop()

The root.geometry() method takes four parameters: width, height, x position, and y position. The %dx%d+%d+%d format string is used to pass these parameters to the method. The x and y positions are calculated by subtracting half of the window size from the width and height of the screen respectively.