Change json.dumps dictionary values in python

问题

So i have following dict:

my_dict{'key1': 'value1',
        'key2': 'value2',
        'key3': json.dumps([
           {"**subkey1**": "subvalue1", "**subkey2**": "subvalue2",},
           {"**subkey1**": "other_subvalue", "**subkey2**":"other_subvalue2"}])
       }

What I need is to somehow made a def where i have to check and for each subkey2 to change its value only for the def itself

And all subkey1 to check if its value is the same like the second subkey1 Please note I am talking about only subkey1 which I have twice.

I don't want to set them manually. Mean I have this dict global, and calling it from many def, so i need to make these changes and check inside each def

What I tried is:

def recurse_keys(my_dict, indent = ''):
    print(indent+str(key))
    if isinstance(my_dict[key], dict):
        recurse_keys(my_dict[key], indent+'   ')
recurse_keys(my_dict)

And for now it is only printing all of my params, but am not sure how to proceed

Example:

my_dict{'name': 'georgi',
        'famili': 'ivanov',
        'drinks': json.dumps([
           {"breakfast": "milk", "lunch": "beer",},
           {"breakfast": "tea",       "lunch":"vodka"}])
def test()
    ....check if both breakfast are the same and if not make them so....(all these, mean dict and the function it self are in same file)

so I need to check if the values for the two breakfast are the same (without to know them) and if they are not, to make them so.

And also to check if there is lunch with empty value or 0 and again if not, to make it so

回答1:

If you want to edit a json string, then probably the easiest way is to decode it to python data types d = json.loads(str), edit it, then encode it back to string str = json.dumps(d) (python JSON).

import json

my_dict = {'name': 'georgi',\
        'famili': 'ivanov',\
        'drinks': json.dumps([\
           {"breakfast": "milk", "lunch": "beer",},\
           {"breakfast": "tea", "lunch":"vodka"}])};

ddict = json.loads(my_dict["drinks"]) # json str to python data types

seen = {}; # store the items already seen

# for each dictionary object in key3
for d in range(0,len(ddict)):
    for k in ddict[d]:
        if k in seen:
            # update the value to the one already seen
            ddict[d][k] = seen[k];

        if k == "lunch" and (ddict[d] == "" or ddict[d] is None):
            ddict[d] = alternative_lunch_value;

        else:
            seen[k] = ddict[d][k];

my_dict["drinks"] = json.dumps(ddict);

print(my_dict);

The result on my machine is:

{'drinks': '[{"breakfast": "milk", "lunch": "beer"}, {"breakfast": "milk", "lunch": "beer"}]',
'famili': 'ivanov',
'name': 'georgi'}

Updating dict values

Because you wanted to update the values in my_dict so that it can be read by other modules, rather than just read the values. If all you wanted to do was read the values, then you can iterate over the list ddict as follows:

for value in ddict:
    print("Sub1:{0} Sub2:{1}\n".format(value["**subkey1**"], value["**subkey2**"]));

However, since you want to update the values in the existing list, then you will need to iterate over a list of the indexes. As shown below...

Range() and len()

Range(start,end) gives a list with values from start to end. So a = range(1,4) assigns [1,2,3,4] to a. Also len(a) will return the number of items in the list, so 4 in this case. Using these principals, you can iterate through your ddict.

for d in range(1,len(ddict):
    ddict[d]["**subkey1**"] = new_value;

Hope this helps get you started. If you update your question with more details on exactly what you want (i.e. example input and output, perhaps psudo code), then we will be able to give you a better answer.

来源：https://stackoverflow.com/questions/35035925/change-json-dumps-dictionary-values-in-python

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python

json

dictionary

nested