AttributeError:str没有属性g

Question

我正在尝试将JSON文件转换为CSV文件并接收attribute error:“str”对象没有属性“get”错误，代码如下。有人能告诉我怎么修理吗？谢谢您。

from sys import argv
from os import path
from types import *

import argparse
import logging
import json
import csv


def main():
    parser = argparse.ArgumentParser(
        description='Convert json file to csv'
    )

parser.add_argument(
    '-i',
    '--input_file',
    dest='input_file',
    default=None,
    required=True,
    help='Source json file (mandatory)'
)
parser.add_argument(
    '-o',
    '--output_file',
    dest='output_file',
    default=None,
    required=True,
    help='Destination csv file (mandatory)'
)

args = parser.parse_args()
input_file = args.input_file
output_file = args.output_file

json_data = []
data = None
write_header = True
item_keys = []

with open(input_file) as json_file:
    json_data = json_file.read()

try:
    data = json.loads(json_data)
except Exception as e:
    raise e

with open(output_file, 'wb') as csv_file:
    writer = csv.writer(csv_file)

    for item in data:
        item_values = []
        for key in item:
            if write_header:
                item_keys.append(key)

            value = item.get(key, '')
            if isinstance(value, StringTypes):
                item_values.append(value.encode('utf-8'))
            else:
                item_values.append(value)

        if write_header:
            writer.writerow(item_keys)
            write_header = False

        writer.writerow(item_values)


if __name__ == "__main__":
    main()

这是sample file

以下是格式化版本：

{
  "off_ball_screens": [
    {
      "possession_id": "20131029121_0",
      "outcomes": [],
      "cutter_defender": 862504243765291,
      "oteam": 12,
      "game_code": 2013102912,
      "led_to_shot": false,
      "location_x": 17.57135,
      "location_y": 36.37835,
      "led_to_touch": false,
      "screener_def_type": "jam",
      "cutter_def_type": "whip",
      "screener": 698955898567260,
      "cutter": 716891544080147,
      "season": 2013,
      "dteam": 22,
      "type": "Wide Pin",
      "frame": 303,
      "chance_id": "20131029121_0_0",
      "id": "2013102912_1_303_698955898567260_716891544080147",
      "period": 1,
      "direct": false,
      "game_clock": 713.9400024414062,
      "screener_defender": 1038700886052194
    },
    {
      "possession_id": "20131029121_0",
      "outcomes": [],
      "cutter_defender": 862504243765291,
      "oteam": 12,
      "game_code": 2013102912,
      "led_to_shot": false,
      "location_x": 7.12878,
      "location_y": 21.16205,
      "led_to_touch": false,
      "screener_def_type": "drop",
      "cutter_def_type": "trail",
      "screener": 842413156760236,
      "cutter": 716891544080147,
      "season": 2013,
      "dteam": 22,
      "type": "Down",
      "frame": 405,
      "chance_id": "20131029121_0_0",
      "id": "2013102912_1_405_842413156760236_716891544080147",
      "period": 1,
      "direct": false,
      "game_clock": 709.5399780273438,
      "screener_defender": 960969254745795
    },
    {
      "possession_id": "20131029121_0",
      "outcomes": [
        "PASS",
        "AST2"
      ],
      "cutter_defender": 715506781586579,
      "oteam": 12,
      "game_code": 2013102912,
      "led_to_shot": false,
      "location_x": 12.18125,
      "location_y": 17.70263,
      "led_to_touch": true,
      "screener_def_type": "jam",
      "cutter_def_type": "trail",
      "screener": 374399613395349,
      "cutter": 42597133322477,
      "season": 2013,
      "dteam": 22,
      "type": "Zipper",
      "frame": 727,
      "chance_id": "20131029121_0_1",
      "id": "2013102912_1_727_374399613395349_42597133322477",
      "period": 1,
      "direct": true,
      "game_clock": 699.0,
      "screener_defender": 217592361774498
    }
  ]
}

Answer 1

您的data变量包含整个JSON，它只有一个键："off_ball_screens"。因此，当您使用item遍历它时，它实际上只是单个键本身。您可以通过使用data[item]访问"off_ball_screens"正在编制索引的列表，但是当您尝试遍历item时，实际上是在遍历一个字符串值，它没有get()函数。

您可以改为：

def main():
    parser = argparse.ArgumentParser(description='Convert json file to csv')
    parser.add_argument(
        '-i',
        '--input_file',
        dest='input_file',
        default=None,
        required=True,
        help='Source json file (mandatory)'
    )
    parser.add_argument(
        '-o',
        '--output_file',
        dest='output_file',
        default=None,
        required=True,
        help='Destination csv file (mandatory)'
    )

    args = parser.parse_args()
    input_file = args.input_file
    output_file = args.output_file

    json_data = []
    data = None
    write_header = True
    item_keys = []

    with open(input_file) as json_file:
        json_data = json_file.read()

    try:
        data = json.loads(json_data)
    except Exception as e:
        raise e

    with open(output_file, 'w') as csv_file:
        writer = csv.writer(csv_file)

        data = data["off_ball_screens"]

        for item in data:
            item_values = []
            for key in item:
                if write_header:
                    item_keys.append(key)

                value = item.get(key, '')
                if isinstance(value, StringTypes):
                    item_values.append(value.encode('utf-8'))
                else:
                    item_values.append(value)

            if write_header:
                writer.writerow(item_keys)
                write_header = False

            writer.writerow(item_values)