Convert JSON values into a string

Question

r = '{"available_sizes":[{"id":104682,"name":"40","preorder_only":false},{"id":104683,"name":"41","preorder_only":false},{"id":104684,"name":"42","preorder_only":false},{"id":104685,"name":"43","preorder_only":false},{"id":104687,"name":"45","preorder_only":false}]}'

data = json.loads(r)

for element in data: 
    for value in data['available_sizes']:
        print(value['name'])

At the moment this prints out the following:

How would I then use this data as a string? Below is the desired output.

Available sizes are 40, 41, 41, 43, 45

`', '.join([str(v['name']) for v in data['available_sizes']])` — cs95, Jun 09 '18 at 21:14
Works a dream thank you - would you like to post as an asnwer so I can award it to you? @coldspeed — Pthomas, Jun 09 '18 at 21:16

score 1 · Accepted Answer · answered Jun 09 '18 at 21:19

Your outermost loop is superfluous, since you only have a single key to iterate over.

Iterate over data, append your numbers to a list, and then call str.join at the end to efficiently join your strings together.

nums = []
for v in data['available_sizes']:
    nums.append(str(v['name']))  # v['name'] if it is already string

print(f'Available sizes are {', '.join(nums)}')

You can rewrite the loop using a list comprehension -

num_str = ', '.join([v['name'] for v in data['available_sizes']])
print(f'Available sizes are {num_str}')

For a primer on JSON data traversals, I recommend looking at this answer.

score 0 · Answer 2 · answered Jun 09 '18 at 21:17

Use a for-comprehension to extract the size names, and then str.join() to add the comma separator:

import json

r = '{"available_sizes":[{"id":104682,"name":"40","preorder_only":false},{"id":104683,"name":"41","preorder_only":false},{"id":104684,"name":"42","preorder_only":false},{"id":104685,"name":"43","preorder_only":false},{"id":104687,"name":"45","preorder_only":false}]}'
data = json.loads(r)

# Extract the size names from the list of available sizes
size_names = [size_entry["name"] for size_entry in data["available_sizes"]]

# Join the sizes names as strings using a comma separator and print
sizes_string = ", ".join(size_names)
print("Available sizes are: " + sizes_string)

score 0 · Answer 3 · answered Jun 09 '18 at 21:27

Do something like that this is the out put that you want

import json

 r = '{"available_sizes":[{"id":104682,"name":"40","preorder_only":false},{"id":104683,"name":"41","preorder_only":false},{"id":104684,"name":"42","preorder_only":false},{"id":104685,"name":"43","preorder_only":false},{"id":104687,"name":"45","preorder_only":false}]}'

data = json.loads(r)

var = []

for element in data: 
    for value in data['available_sizes']:
        var.append(value['name'])
print( 'Availble size are %s' %(', '.join(var)))

Convert JSON values into a string

3 Answers3