Check if python dict value exists

Question

So I'm new to dicts and I'm trying to lookup and save usernames inside a json dictionary and I keep getting that the username is not in the dictionary, I've tried a few solutions I found here but none seem to work, is it something with my dict?

        username = input("Write your username: ")

            user_data['users'].append({
                'name': f'{username}',
                'highscore': '0',
                'table': ['-', '-', '-', '-', '-', '-', '-', '-', '-'],
                'turn': '1'
            })
            with open('user_data.json', 'w') as file:
                json.dump(user_data, file, indent=4)

Tried this and a few similar ones

"name" in user_data.values()

Does this answer your question? [Check if a given key already exists in a dictionary](https://stackoverflow.com/questions/1602934/check-if-a-given-key-already-exists-in-a-dictionary) — mkrieger1, Jan 10 '21 at 18:14
@mkrieger had seen that one before posting it didn't work though — João Brito, Jan 10 '21 at 18:25
@JoãoBrito - a dictionary is an unordered key - values list, whereby the keys has to be unique. ( maybe a good practice --> give each user an ID instead of using a real (string) name). + yes you can add new values to a dictionary --> user_data['users'][username] = { ... } <--- — Dieter, Jan 10 '21 at 19:18

kwkt · Accepted Answer · 2021-01-10T18:16:03.727

0

You need to look for name key in each of the dictionaries in the list that corresponds to the key users of the dictionary user_data (that was a mouthful).

any('name_to_search_for' == user['name'] for user in user_data['users'])

edited Jan 10 '21 at 18:16

answered Jan 10 '21 at 18:13

kwkt

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This might do what OP *asked* for, but not what they *meant* – DeepSpace Jan 10 '21 at 18:14
@DeepSpace I edited the answer. `name` is indeed ambiguous. – kwkt Jan 10 '21 at 18:16
Doesn't that just return the key? – João Brito Jan 10 '21 at 18:19
@JoãoBrito no, this returns whether your username exists in some dict in your list. Try it yourself! If you want the whole dictionary corresponding to that username, then I can edit the code for that too. – kwkt Jan 10 '21 at 18:19
@kwkt Seemed to work! Thank you very much – João Brito Jan 10 '21 at 18:23

Check if python dict value exists

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