diff -Naur disper/src/xrandr/__init__.py disper-new/src/xrandr/__init__.py

--- disper/src/xrandr/__init__.py	2011-09-09 16:20:45.000000000 +0200

+++ disper-new/src/xrandr/__init__.py	2016-07-28 15:33:34.391703460 +0200

@@ -83,10 +83,20 @@

 from core import Screen, xlib, rr

+xopendisplay = None

+class Display(Structure): pass

+

+def get_display(name):

+    global xopendisplay

+    if xopendisplay is None:

+        xopendisplay = xlib.XOpenDisplay

+        xopendisplay.restype = POINTER(Display)

+    return xopendisplay(name)

+

 def get_current_display():

     """Returns the currently used display"""

     display_url = os.getenv("DISPLAY")

-    dpy = xlib.XOpenDisplay(display_url)

+    dpy = get_display(display_url)

     return dpy

 def get_current_screen():

@@ -98,7 +108,7 @@

 def get_screen_of_display(display, count):

     """Returns the screen of the given display"""

-    dpy = xlib.XOpenDisplay(display)

+    dpy = get_display(display)

     return Screen(dpy, count)

 def get_version():