Python在dict_keys和交换值中查找dict和嵌套值

Question

I'm attempting to swap values in dictionary(dic_map) with values from dictionary(B), where dic_map[key] = B. to give me a new dict with the values from B eg

dic_map = {
    'Name': 'name',
    'Id': 'guid',
    'address':{
        'address1': 'road',
        'address2': 'road_nr',
        'address3': 'zipcode',
        'address4': 'city'
    },
    'tax': True,
    'isValid': False,
    'specific': 1,
    'credit': 200
}


B = {
    'name': 'Michael Jackson',
    'guid': '032-567-781',
    'road': 'The greatest Dr',
    'road_nr': 42,
    'zipcode': 90210,
    'city': 'Hollywood',
    'country': 'USA'
}

And the final dict

desired_result = {
    'Name': 'Michael Jackson',
    'Id': '032-567-781',
    'address':{
        'address1': 'The greatest Dr',
        'address2': 42,
        'address3': 90210,
        'address4': 'Hollywood',
    },
    'tax': True,
    'isValid': False,
    'specific': 1,
    'credit': 200
}

This is what I have so far

def swap_values(dic_values, dic_map):
    d = {}
    for k1 in dic_values.keys():
        for k2 in dic_map.keys():
            if k1 == dic_map[k2]:
                d[k2]=dic_values[k1]
            else:
                d[k2]=dic_map[k2]
    return d

There are 2 things that is not working as far as I can tell, 1. my values gets overwritten by the else statement, and 2. the nested dict is never evaluated. Any help would be appreciated.

Answer 1

As there are inner dicts, we must repeat the replacement operation for every inner dict. The easiest way to perform that kind of task is using recursion.

Validating type is not considered very pythonic , but it will get the job done. You can do something like this:

def swap_values(dic_values, dic_map):
    d = {}

    for k, v in dic_values.items():
        if isinstance(v, dict):
            d[k] = swap_values(v, dic_map)
        else:
            d[k] = dic_map.get(v, v)

    return d

Sample usage:

>>> dic_map = {
...     'Name': 'name',
...     'Id': 'guid',
...     'address':{
...         'address1': 'road',
...         'address2': 'road_nr',
...         'address3': 'zipcode',
...         'address4': 'city'
...     },
...     'tax': True,
...     'isValid': False,
...     'specific': 1,
...     'credit': 200
... }
>>> 
>>> 
>>> B = {
...     'name': 'Michael Jackson',
...     'guid': '032-567-781',
...     'road': 'The greatest Dr',
...     'road_nr': 42,
...     'zipcode': 90210,
...     'city': 'Hollywood',
...     'country': 'USA'
... }
>>> swap_values(dic_map, B)
{'specific': 1, 'Name': 'Michael Jackson', 'credit': 200, 'address': {'address1': 'The greatest Dr', 'address2': 42, 'address4': 'Hollywood', 'address3': 90210}, 'isValid': False, 'tax': True, 'Id': '032-567-781'}

If there were no inner dicts, we could use:

def swap_values(dic_values, dic_map):
    d = {}

    for k, v in dic_values.items():
        d[k] = dic_map.get(v, v)

    return d

Sample usage:

>>> dic_map = {
...     'Name': 'name',
...     'Id': 'guid',
...     'tax': True,
...     'isValid': False,
...     'specific': 1,
...     'credit': 200
... }
>>> 
>>> 
>>> B = {
...     'name': 'Michael Jackson',
...     'guid': '032-567-781',
...     'road': 'The greatest Dr',
...     'road_nr': 42,
...     'zipcode': 90210,
...     'city': 'Hollywood',
...     'country': 'USA'
... }
>>> swap_values(dic_map, B)
{'specific': 1, 'isValid': False, 'Name': 'Michael Jackson', 'Id': '032-567-781', 'tax': True, 'credit': 200}

Answer 2

Here's what I got:

def dmap(template, values):
    for key, val in template.items():
        if isinstance(val, dict):
            dmap(val, values)
        else:
            if val in values:
                template[key] = values[val]

If I run dmap(dic_map, B) I get:

{
  'Id': '032-567-781',
  'Name': 'Michael Jackson',
  'address': {
    'address1': 'The greatest Dr',
    'address2': 42,
    'address3': 90210,
    'address4': 'Hollywood'
  },
  'credit': 200,
  'isValid': False,
  'specific': 1,
  'tax': True
}