Error: reading dictionary from json file: too many values to unpack

See error message and dictionary below:

Traceback (most recent call last):
  File "C:/Users/richarddoi/Desktop/blackjack/test blackjack csv.py", line 9, in <module>
    for key,value in data:
ValueError: too many values to unpack (expected 2)

{'Ace of Hearts': 1, 'King of Hearts': 10, 'Queen of Hearts': 10, 'Jack of Hearts': 10, '10 of Hearts': 10, '9 of Hearts': 9, '8 of Hearts': 8, '7 of Hearts': 7, '6 of Hearts': 6, '5 of Hearts': 5, '4 of Hearts': 4, '3 of Hearts': 3, '2 of Hearts': 2, 'Ace of Spades': 1, 'King of Spades': 10, 'Queen of Spades': 10, 'Jack of Spades': 10, '10 of Spades': 10, '9 of Spades': 9, '8 of Spades': 8, '7 of Spades': 7, '6 of Spades': 6, '5 of Spades': 5, '4 of Spades': 4, '3 of Spades': 3, '2 of Spades': 2, 'Ace of Clubs': 1, 'King of Clubs': 10, 'Queen of Clubs': 10, 'Jack of Clubs': 10, '10 of Clubs': 10, '9 of Clubs': 9, '8 of Clubs': 8, '7 of Clubs': 7, '6 of Clubs': 6, '5 of Clubs': 5, '4 of Clubs': 4, '3 of Clubs': 3, '2 of Clubs': 2, 'Ace of Diamonds': 1, 'King of Diamonds': 10, 'Queen of Diamonds': 10, 'Jack of Diamonds': 10, '10 of Diamonds': 10, '9 of Diamonds': 9, '8 of Diamonds': 8, '7 of Diamonds': 7, '6 of Diamonds': 6, '5 of Diamonds': 5, '4 of Diamonds': 4, '3 of Diamonds': 3, '2 of Diamonds': 2}

This appears when I use the following code:

import json

with open('deckfile.json') as f:
    data = [json.loads(line) for line in f]
    for row in data:
        print(row)

But at this point, when I try to print the key and the value, using this code:

    for key,value in data:
        print(key, value)

I get an error message. To date, I've used txt and binary files successfully. I've never used to a dictionary before in reading from a file.

My question is: what is meant by too many values? As far as I know, there is a dictionary with: the name of the card and the value of the card for every card in a 52 card deck. I used a convention to try to get the key and the value without a success.

Solution

In for key,value in data, there are two problems:

data is the list of dictionaries. You probably meant for key,value in row.
Iterating over a dictionary only iterates over its keys. To iterate over both keys and values, do for key,value in row.items().

My question is: what is meant by too many values?

for key,value in data means that data should be an iterable of pairs that get unpacked into key and value. But the first thing you get when iterating over data is the big dictionary it contains. To try to unpack the dictionary into key, value, Python iterates over the dictionary and gets all 52 keys, which is too many values.

Think of it this way: you wouldn't do:

for row in data:
    key, value = row

because the row has many keys and values. Nor would you do:

for k in row:
    key, value = k

because k is a key of row, which is a string. Hence we need .items().