来自 JSON 对象的字典未使用 DictWriter 写入文件

Question

我正在使用 oauth2 库解析 jira 数据库，接收我正在使用 UTF-8 解码的字节对象，然后使用 json.loads 将结果字符串对象作为字典返回。然后我尝试使用DictWriter 将其写入平面文件，但它返回以下错误：

File "/Users/mharris/PycharmProjects/CodeRepo/jira_oauth.py", line 206, in <module>
    writer.writerows(data)
  File "/Users/mharris/anaconda/lib/python3.5/csv.py", line 156, in writerows
    return self.writer.writerows(map(self._dict_to_list, rowdicts))
  File "/Users/mharris/anaconda/lib/python3.5/csv.py", line 150, in <genexpr>
    return (rowdict.get(key, self.restval) for key in self.fieldnames)
AttributeError: 'str' object has no attribute 'get'

我正在做一个print(type(data)) 来验证它确实是一本字典。 这是我的代码的摘录：

with psycopg2.connect(
        host=settings.REDSHIFT_HOST,
        port=settings.REDSHIFT_PORT,
        database=settings.REDSHIFT_DATABASE,
        user=settings.REDSHIFT_USER,
        password=settings.REDSHIFT_PASS) as conn:

    cur = conn.cursor()

    get_cols = '''
    SELECT *
    FROM ods_jira.staging_jira_issues
    LIMIT 10
    '''

    cur.execute(get_cols)
    colnames = [desc[0] for desc in cur.description]

    max_res = 1000
    data_url = data_url_base + mk_data_endpoint(max_res, start_at)

with gzip.open('jira_data.txt.gz', 'w') as outf:
    writer = DictWriter(outf,
                        delimiter='|',
                        quotechar='"',
                        fieldnames=colnames,
                        extrasaction='ignore')

    for cycle in range(1):
        response, content = client.request(data_url, 'GET')
        if response['status'] != '200':
            raise Exception('Unable to access page, code was: ',
                            response['status'])

        str_resp = content.decode('utf-8')
        print(type(str_resp))
        data = json.loads(str_resp)
        print(type(data))
        writer.writerows(data)

        start_at += 1000

Answer 1

writerows 需要一个字典列表。如果您有一本字典，请使用 writerow。

str_resp = content.decode('utf-8')
print(type(str_resp))
data = json.loads(str_resp)
print(type(data))
writer.writerow(data)