update an entire dictionary in a list of dictionaries based on key value pair

Question

I have a list of dictionaries and I have to update an entire dictionary based on a specific key-value pair

values = [
            {
                "value" : "AAA",
                "rank" : 10,
                "id" : 1
            },
            {
                "value" : "BBB",
                "rank" : 50,
                "id" : 2
            }
]

I will receive a new list value_new = [{"value" : "CCC","rank" : 20,"id" : 1}]. The idea is to match the id and update the entire dictionary related to that id and sort the entire values list based on rank.

I iterated through values list and matched based on id and when I tried to update it replaced the entire value list

I tried this piece of code

for val in range(len(values)):
   if values[val]['id'] == value_new['id']:
     values[val] = value_new

I am unable to sort it after appending.

What you did would have worked except you have bugs in that code. It is not efficient, though. You might consider OrderedDict with id as the key, sorted by rank. — Kenny Ostrom, Aug 08 '19 at 19:04
Do you mean something like [this](https://stackoverflow.com/questions/72899/how-do-i-sort-a-list-of-dictionaries-by-a-value-of-the-dictionary)? You might also use the id as a key for the specific dictionaries. — csabinho, Aug 08 '19 at 19:07
I tried values[val] and value[new][0] and the issue got resolved. The dictionary was replaced as an entire list which was the cause of the issue — Aditya, Aug 08 '19 at 20:02

nmpauls · Answer 1 · 2019-08-08T19:23:16.323

I attempted to replicate what you want to do with this code:

values = [
            {
                "value" : "AAA",
                "rank" : 10,
                "id" : 1
            },
            {
                "value" : "BBB",
                "rank" : 50,
                "id" : 2
            }
]

print(values)

value_new = [{
                "value" : "CCC",
                "rank" :20,
                "id" : 1
            }]

# code for editing here
for val in values:
    if value_new[0]['id'] == val['id']:
        for key in value_new[0]:
            val[key] = value_new[0][key]

print(values)

This changed the dictionary as you described:

Before:

[{"value" : "AAA", "rank" : 10, "id" : 1}, {"value" : "BBB", "rank" : 50, "id" : 2}]

After:

[{"value" : "CCC", "rank" : 20, "id" : 1}, {"value" : "BBB", "rank" : 50, "id" : 2}]

update an entire dictionary in a list of dictionaries based on key value pair

1 Answers1