This converts the json file (you'll have to extract 'export.data' file from '*.1pux' file) exported from 1password (linux app) to .csv

1password_1pux_to_csv.py

#! /usr/bin/python3
import json
import csv

# extract export.data from .1pux file using archive manager

# extract.data is a json file
json_file_path = './export.data'

# output file path
csv_to_export_name = './1password-export.csv'

fields = ['url', 'name', 'username', 'password']


def get_rows():
    records = []
    with open(json_file_path, 'r') as json_file:
        j = json.load(json_file)
        for account in j['accounts']:
            for vault in account['vaults']:
                for item in vault['items']:
                    username = ''
                    password = ''
                    name = ''
                    url = ''
                    loginFields = item['item']['details']['loginFields']
                    for field in loginFields:
                        if field['fieldType'] == 'T':
                            username = field['value']
                        if field['fieldType'] == 'P':
                            password = field['value']
                    name = item['item']['overview']['title']
                    url = item['item']['overview']['url']
                    if username == '' and password == '':
                        ...
                    else:
                        records.append([url, name, username, password])
    return records


def transform():
    with open(csv_to_export_name, 'w') as csvfile:
        csvwriter = csv.writer(csvfile)
        csvwriter.writerow(fields)
        for row in get_rows():
            csvwriter.writerow(row)


if __name__ == '__main__':
    transform()

it seems like you should remove ['item']. at least that was needed to convert my file i generated today