最后一行改成move(0, 'a', 'b', 'c')结果：如下，是不是死循环

Traceback (most recent call last):

  File "index.py", line 8, in 

    move(0, 'a', 'b', 'c')

  File "index.py", line 5, in move

    move(n-1, a, c, b)

  File "index.py", line 5, in move

    move(n-1, a, c, b)

  File "index.py", line 5, in move

    move(n-1, a, c, b)

  File "index.py", line 5, in move

    move(n-1, a, c, b)

  File "index.py", line 5, in move

    move(n-1, a, c, b)

  File "index.py", line 5, in move

    move(n-1, a, c, b)

  File "index.py", line 5, in move

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