存储路径到字典值 [英] Store path to dictionary value

问题描述

如何将路径存储在 dict 中 dict 中的值？例如，我们可以轻松地将路径存储在变量 name_field 中的名称中：

  person = {} 
 person ['name'] ='Jeff Atwood'
 person ['address'] = {} 
 person ['address'] ['street'] ='Main Street'
 person ['address'] ['zip'] ='12345'
 person ['address'] [ 'city'] ='迈阿密'
 
＃获取名称
 name_field ='name'
 print（person [name_field]）
  

如何存储 city 值的路径？

 ＃获取城市
 city_field = ['地址'，'城市'] 
打印（person [city_field]）//显然赢得'工作！ 
  

解决方案

您可以使用 / code>函数做这个

  print reduce（lambda x，y：x [y]，city_field，person ）
  

输出



迈阿密


How might one store the path to a value in a dict of dicts? For instance, we can easily store the path to the name value in a variable name_field:

person = {}
person['name'] = 'Jeff Atwood'
person['address'] = {}
person['address']['street'] = 'Main Street'
person['address']['zip'] = '12345'
person['address']['city'] = 'Miami'

# Get name
name_field = 'name'
print( person[name_field] )

How might the path to the city value be stored?

# Get city
city_field = ['address', 'city']
print( person[city_field] )  // Obviously won't work!

解决方案

You can use reduce function to do this

print reduce(lambda x, y: x[y], city_field, person)

Output

Miami

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