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Oct 18th, 2019
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  1. # 以下是交换两个变量的快速方法，而且无需使用额外的变量。
  2.  
  3. def swap(a, b):
  4. return b, a
  5. a, b = -1, 14
  6. swap(a, b) # (14, -1)
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