Fix some comments; move 'import random' to top.

diff --git a/Demo/tkinter/guido/electrons.py b/Demo/tkinter/guido/electrons.py
index e1fe1cb2e5875ed230967b86aefc8d5bd7af50be..97dad2d7336f25aaa15d658500fed802174d5ecf 100755 (executable)
--- a/Demo/tkinter/guido/electrons.py
+++ b/Demo/tkinter/guido/electrons.py
@@ -5,14 +5,14 @@
 #
 # Usage: electrons [n [bitmapfile]]
 #
-# n is the number of electrons to animate; default is 4, maximum 15.
+# n is the number of electrons to animate; default is 30.
 #
 # The bitmap file can be any X11 bitmap file (look in
 # /usr/include/X11/bitmaps for samples); it is displayed as the
 # background of the animation.  Default is no bitmap.
 
-# This uses Steen Lumholt's Tk interface
 from Tkinter import *
+import random
 
 
 # The graphical interface
@@ -32,25 +32,23 @@ class Electrons:
                                                      bitmap=bitmap,
                                                      foreground='blue')
 
-               self.pieces = {}
+               self.pieces = []
                x1, y1, x2, y2 = 10,70,14,74
-               for i in range(n,0,-1):
+               for i in range(n):
                        p = c.create_oval(x1, y1, x2, y2, fill='red')
-                       self.pieces[i] = p
+                       self.pieces.append(p)
                        y1, y2 = y1 +2, y2 + 2
                self.tk.update()
 
-       def random_move(self,n):
-               import random
+       def random_move(self, n):
                c = self.canvas
-               for i in range(1,n+1):
-                       p = self.pieces[i]
+               for p in self.pieces:
                        x = random.choice(range(-2,4))
                        y = random.choice(range(-3,4))
                        c.move(p, x, y)
                self.tk.update()
 
-       # Run -- never returns
+       # Run -- allow 500 movemens
        def run(self):
                try:
                        for i in range(500):
@@ -66,7 +64,7 @@ class Electrons:
 def main():
        import sys, string
 
-       # First argument is number of pegs, default 4
+       # First argument is number of electrons, default 30
        if sys.argv[1:]:
                n = string.atoi(sys.argv[1])
        else:
@@ -91,5 +89,3 @@ def main():
 # Call main when run as script
 if __name__ == '__main__':
        main()
-
-