TypeError：字符串索引必须是整数，同时尝试将 json 转换为 csv

Question

I am getting this error upon running the below code

import json
import csv
with open ("sample-json-file.json") as file:
    data = json.load(file)
    
fname = "output.csv"

with open(fname,"w") as file:
    csv_file =csv.writer(file)
    csv_file.writerow(["Name", "Mobile", "Boolean", "Country"])
    for item in data:
        csv_file.writerow([item['name'], item['mobile'], item['boolean'], item['country']])

My json file has the following content-

{
   "Name": "Test",
   "Mobile": 12345678,
   "Boolean": "true",
   "Pets": ["Dog", "cat"],
   "country" : "India"
}

Please suggest what changes are to be made, I would be very grateful.

Traceback

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-36-9719807e095c> in <module>
      8     csv_file.writerow(["Name", "Mobile", "Boolean", "Country"])
      9     for item in data:
---> 10         csv_file.writerow([item['name'], item['mobile'], item['boolean'], item['country']])

TypeError: string indices must be integers

Answer 1

If the data is a single dict in a file

• Given the data in this example
• Using your code as presented
• for item in data: is not needed because you are already writing the keys from data and there is nothing to iterate through.

with open ("test.json") as file:
    data = json.load(file)
    
fname = "output.csv"

with open(fname,"w") as file:
    csv_file =csv.writer(file)
    csv_file.writerow(["Name", "Mobile", "Boolean", "Country"])
    csv_file.writerow([data['Name'], data['Mobile'], data['Boolean'], data['country']])

If the data is a list of dicts in a file, as follows:

[ {
        "Name": "Test",
        "Mobile": 12345678,
        "Boolean": "true",
        "Pets": ["Dog", "cat"],
        "country": "India"
    }, {
        "Name": "Test",
        "Mobile": 12345678,
        "Boolean": "true",
        "Pets": ["Dog", "cat"],
        "country": "India"
    }]

• Now for item in data: is needed to loop through each dict in the list

with open ("test.json") as file:
    data = json.load(file)

fname = "output.csv"

with open(fname,"w") as file:
    csv_file =csv.writer(file)
    csv_file.writerow(["Name", "Mobile", "Boolean", "Country"])
    for item in data:
        csv_file.writerow([item['Name'], item['Mobile'], item['Boolean'], item['country']])

Answer 2

Your example json is a single dict . When you try to iterate it, you get the dictionary keys (in your case, strings) and of course "name"["name"] isn't a thing. You could remove the for loop (its just 1 dict, not a list of dicts) and writerow(data['nmae'], ..) but csv has a DictWriter class you can use instead.

import json
import csv
with open ("sample-json-file.json") as file:
    data = json.load(file)

fname = "output.csv"

fieldnames = ["Name", "Mobile", "Boolean", "Country"]

with open(fname,"w") as file:
    csv_file =csv.DictWriter(file, fieldnames=fieldnames, extrasaction='ignore')
    csv_file.writeheader()
    csv_file.writerow(data)