如何遍历列表中的json字典

Question

I am doing web scraping, and I got data in a json object that looks like this:

{'categories': '[{"title":"Name", "desc":"Mike"}, {"title":"Food", "desc":"Muffin"}]'}

And I want to loop through this dictionary and just get one value "Muffin". My code is:

for item in the_dict:
    for i in range(0, len(item)-1):
        muff_filter = json.loads(the_dict['categories'])[i]['title']    
        if muff_filter == 'Food':
            print(json.loads(the_dict['categories'])[i]['desc'])
        else:
            pass  

I get expected output, however I keep getting the error:

Muffin
---------------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-50-9a650257d42a> in <module>
     61     for item in the_dict:
     62         for i in range(0, len(item)-1):
---> 63             food_filter = json.loads(the_dict['categories'])[i]['title']
     64             if food_filter == 'Food':
     65                 print(json.loads(the_dict['categories'])[i]['desc'])

IndexError: list index out of range

I tried enumerating the list but still get the same error, and also tried using a key, value pair but the same error. Can you give me an idea where I'm thinking wrong?

+++ So I have run %xmode Verbose according to the suggestion in the comment, and I got the following error:

Muffin
--------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-68-e1844b3cae82> in <module>
     61     for item in get_cert:
     62         for i in range(0, len(item)-2):
---> 63             the_dict= json.loads(the_dict['categories'])[i]['title']

        global get_cert = {'categories': '[{"title":"Name","desc":"Mike"},{"title":"Food","desc":"Muffin"}]'}
        global i = 2
     64             if muff_filter == 'Food':
     65                 print(json.loads(the_dict['categories'])[i]['desc'])

IndexError: list index out of range

Answer 1

If you have multiple blobs of json data in the_dict iterate over each blob:

for jsondata in the_dict.values(): 
    for d in json.loads(jsondata):
        if d.get('title') == 'Food':
            print(d['desc'])

or if you know there is only one blob of json data in the_dict and it's under the key 'categories' :

for d in json.loads(the_dict['categories']):
    if d.get('title') == 'Food':
        print(d['desc'])

Answer 2

for key, values in the_dict.items():
    jvalues = json.loads(values)
    for val in jvalues:
        muff_filter = json.loads(val)['title']    
        if muff_filter == 'Food':
            print(json.loads(val)['desc'])
        else:
            pass