如何使用 python 中的索引从 json 列表中获取值？

Question

How can I print 'abcd' here?

import json

my_dict = {
    "test": "hello world",
    'my_list': [{
        'a_value': "abcd",
        'another_value': 'asdf'
    }]
}

stuff = json.dumps(my_dict)
stuff = json.loads(stuff)

e = stuff[my_list][1] # An attempt
print(e) # IndexError: list index out of range

I want to specifically use the index (1, not 'a_value').

Answer 1

Try this:-

import json

my_dict = {
    "test": "hello world",
    'my_list': [{
        'a_value': "abcd",
        'another_value': 'asdf'
    }]
}

stuff = json.dumps(my_dict)
stuff = json.loads(stuff)

e = my_dict['my_list'][0]['a_value']
print(e) 

It will work!

Answer 2

There are 2 problems with your attempt:

1. my_list is a key in the json object, it works similar to a dict. Therefore, you must refer to it as a key in the object and enclose it in ''.
2. 'my_list' has the value of a list, therefore the first element of the list shall be accessed, and only then can you access the key 'a_value'.

In dictionary or json objects, you cannot refer to the keys via an index. Therefore, you cannnot use '1' to refer to 'a_value'. Your other option could be to create a list of the values of the object and then use the index. This can be done as:

import json

my_dict = {
    "test": "hello world",
    'my_list': [{
        'a_value': "abcd",
        'another_value': 'asdf'
    }]
}

stuff = json.dumps(my_dict)
stuff = json.loads(stuff)
e = list(list(stuff.values())[1][0].values())[0]
print(e)

The output of the above statement will be:

abcd

Or, as suggested by @Dr. Strange Codes, you could do something like this although I am guessing this is not what you are looking for:

e = stuff['my_list'][0]['a_value']

The output will be:

abcd