Hello, I thought the following should end with G[1] and G[0] returning 20. Why doesn't it? In [69]: a = 10 In [70]: G = {} In [71]: G[0] = [a] In [72]: G[1] = G[0] In [73]: a = 20 In [74]: G[1] Out[74]: [10] In [75]: G[0] Out[75]: [10] ??