python tkinter窗口居中对齐实例源码。tkinter没有现成的窗口居中的功能，只能间接地算出来。

from Tkinter import *
def center_window(w=300, h=200):
# get screen width and height
ws = root.winfo_screenwidth()
hs = root.winfo_screenheight()
# calculate position x, y
x = (ws/2) – (w/2)
y = (hs/2) – (h/2)
root.geometry(‘%dx%d+%d+%d’ % (w, h, x, y))
root = Tk()
center_window(500, 300)
root.mainloop()