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zmrenwu
V2EX  ›  Python

如何理解这段代码(一行代码实现一个树结构字典)?

  •  
  •   zmrenwu · Nov 7, 2016 · 2257 views
    This topic created in 3481 days ago, the information mentioned may be changed or developed.
    from collection import defaultdict
    
    tree = lambda: defaultdict(tree)
    

    运行:

    tree['foo']['bar'] = 'span'
    

    结果:

    {'foo', {'bar': 'span'}}
    

    无法理解 lambda 函数里面的递归,可否解释一下代码究竟是怎么样执行的?

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