Document the functions

proarbeit.py

@@ -1,15 +1,23 @@
-from mouse import get_position, move
+from mouse import move
 from secrets import randbelow
 from time import sleep
 
 
 def erratic_movement(screen_width, screen_height):
+    """
+    Moves the cursor to a random position with the screen's
+    width and height as an upper bound
+    """
     move(
         randbelow(screen_width), randbelow(screen_height),
     )
 
 
 def main():
+    """
+    Calls the movement function in an infinite loop,
+    with a random delay between each call
+    """
     screen_width = 800
     screen_height = 600
     while True: