收集两列

Question

我正在尝试在CSV中的两列上使用“NCR”中的数据。但是它会相互覆盖，只会在名为“YesterdayTime”的列中显示数据。

有没有办法在名为’ExTime’和‘YesterdayTime’的列中使用“NCR”中的数据？

我的代码

from datetime import datetime
from elasticsearch import Elasticsearch
import csv

es = Elasticsearch(["9200"])

res = es.search(index="search", body=
                {
                    "_source": ["VT","NCR","N","DT","RD"],
                    "query": {

                        "bool": {
                            "must": [{"range": {"VT": {
                                            "gte": "now/d",
                                            "lte": "now+1d/d"}}},

                                {"wildcard": {"user": "mike*"}},
                                {"wildcard": {"user": "jane*"}},
                                {"wildcard": {"user": "kate*"}},
                                {"wildcard": {"user": "dave*"}},
                                {"wildcard": {"user": "rich*"}}

]}}},size=10)


csv_file = 'File_' + str(datetime.now().strftime('%Y_%m_%d - %H.%M.%S')) + '.csv'


header_names = { 'VT': 'Date',  'NCR': 'ExTime', 'NCR': 'YesterdayTime', 'N': 'Name', 'DT': 'Party', ' RD ': 'Period'}

with open(csv_file, 'w', newline='') as f:
    w = csv.DictWriter(f, fieldnames=header_names.keys(), restval='', extrasaction='ignore')
    w.writerow(header_names,)
    for doc in res['hits']['hits']:
        my_dict = doc['_source']

             w.writerow(my_dict)

输出 - EX time正在替换为YesterdayTime。

DATE         YesterdayTime      Name   Party   Period

20170512    12/05/2017 15:39    1001    0        0

20170512    12/05/2017 15:39    1001    0        0

20170908    08/09/2017 02:42    1001    0        0

20170908    08/09/2017 06:30    1001    0        0

我想要的正确输出：

DATE       YesterdayTime     YesterdayTime       Name   Party   Period

20170512  12/05/2017 15:39   12/05/2017 15:39    1001     0        0

20170512  12/05/2017 15:39   12/05/2017 15:39    1001     0        0

20170908  08/09/2017 02:42   08/09/2017 02:42    1001     0        0

20170908  08/09/2017 06:30   08/09/2017 06:30    1001     0        0

Answer 1

Python词典不支持重复键。您在header_names字典中最后一次出现'NSC'会覆盖第一个。

Answer 2

您可以为字段名指定包含重复项的列表。

with open('test.csv', 'w') as f:
    csv_file = csv.DictWriter(f, fieldnames=['foo', 'bar', 'bar', 'bar'])
    csv_file.writeheader()
    csv_file.writerow({'foo':1, 'bar':2})

test.csv包含：

foo,bar,bar,bar
1,2,2,2

但是，如果您需要不同的标题名称，则无法解决问题...