飞行中生成字典键 [英] Generating dictionary keys on the fly

问题描述

使用深层嵌套的python dicts，我希望能够在这样的数据结构中分配值：

  mydict [key] [subkey] [subkey2] =value
  

而无需检查mydict [key]等实际设置为一个dict，例如使用

 如果不是密码mydict：mydict [key] = {} 
  / pre> 
 
 
创建子例句应该是即时发生的。什么是最优雅的方式来允许等同的东西 - 也许在标准的< type'dict'> 中使用装饰器？
解决方案
 
  class D（dict）：
 def __missing __（self，key）：
 self [key] = D（）
 return self [key] 
 
d = D（）
d ['a'] ['b'] ['c'] = 3 
  
 
Working with deeply nested python dicts, I would like to be able to assign values in such a data structure like this:
  mydict[key][subkey][subkey2]="value"
without having to check that mydict[key] etc. are actually set to be a dict, e.g. using
  if not key in mydict: mydict[key]={}
The creation of subdictionaries should happen on the fly. What is the most elegant way to allow something equivalent - maybe using decorators on the standard <type 'dict'>?
解决方案
class D(dict):
    def __missing__(self, key):
        self[key] = D()
        return self[key]

d = D()
d['a']['b']['c'] = 3


                        
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