how to write an operation in a json file?-CodePudding

today i'm tryng to stylize my list of audiobooks but for doing so i have to make every object with an aspectRatio (key= value) in my json file but it gives me an error .

if i can't write like this in my json file how can i do it ? thank you in avance

CodePudding user response：

...
"aspectRatio": { "width": 150, "height": 200 },
...

Or if the actual numbers don't matter:

...
"aspectRatio": 0.75,
...

CodePudding user response：

you can't do it, json is a data exchange format, not programable

the work-arround solution is:

import json
json_str = """
{
    "expr": "150/200"
}
"""
j = json.loads(json_str)
result = eval(j["expr"])
print(result)

but this may lead to security issue, if some body fill the value of expr as:

rm -rf /

that would be interesting