Python: convert csv file to json file

Question

I am trying to convert a csv file to a json file by reading the content of the csv file and writing it to a new json file. I am encountering an error that is at the point where I try to make a column of the csv file into dictionary keys. How can I resolve this error?

My code for reference:

import csv 
import json

def jsonformat(infile,outfile):
    contents = {}
    csvfile = open(infile, 'r')
    reader = csvfile.read()

    for m in reader:
        key = m['Order ID']
        contents[key] = m
    
    jsonfile = open(outfile, 'w')
    json_contents = json.dumps(contents, indent = 4)
    jsonfile.write(json_contents)

    csvfile.close()
    jsonfile.close()
    return json_contents



infile = 'orders.csv'
outfile = 'orders.json'

output = jsonformat(infile,outfile)

print(output)

error message: TypeError Traceback (most recent call last) in 28 outfile = 'orders.json' 29 ---> 30 output = jsonformat(infile,outfile) 31 32 print(output)

in jsonformat(infile, outfile) 12 13 for m in reader: ---> 14 key = m['Order ID'] 15 contents[key] = m 16

TypeError: string indices must be integers

pho · Accepted Answer · 2021-10-12 19:53:52Z

2

You aren't reading the CSV file the correct way. Use csv.DictReader to read each row as a dictionary. Then, you'll be able to use for m in reader: key = m['Order ID'].

Change reader = csvfile.read() to reader = csv.DictReader(csvfile)

As of now, reader is a string that contains all the contents of your file. for m in reader makes m each character in this string, and you cannot access the "Order ID" key on a character.

After you make the change, reader will be a DictReader object, and iterating over it will return each row as a dictionary.

answered Oct 12, 2021 at 19:53

pho

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1 Comment

Geraldo Over a year ago

Thank you for your help!

Unmitigated · Accepted Answer · 2021-10-12 19:55:32Z

1

You can use csv.DictReader.

reader = csv.DictReader(csvfile)
for line in reader:
    key = line['Order ID']
    contents[key] = m

answered Oct 12, 2021 at 19:55

Unmitigated

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1 Comment

Geraldo Over a year ago

Thank you for your help!

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