Python two-dimensional array of key values generates a turn to JSON

Today, as needed, some of the data crawled by the crawler is sorted into a two-dimensional array, then encoded into a JSON string to pass into the database

So the problem is, in PHP, the process is simple, something like this:

$arr [$key 1][$key 2]= $value

In Python, the string cannot be used as a key value, and I don't know about Python, I didn't find the data, and I found this function:

Dict.setdefault (Key, Default=none) is similar to get (), but if the key does not exist in the dictionary, the key is added and the value is set to default

As a result, the key value as two parameters passed in, and so on to achieve a similar effect, I hope to help you

Dict.setdefault (Key, Default=none) is similar to get (), but if the key does not exist in the dictionary, the key is added and the value is set to default