Question

我不确定标题的字词，但基本上我有以下内容：

{
  "restaurantName": "Restaurant 1",
  "restaurantLink": "Link 1",
  "restaurantType": "Type 1",
  "restaurantAddress": "Address 1",
  "dateRetrieved": "14-11-2018",
  "review": {
    "reviewer": "Reviewer 1",
    "reviewDetail": "Review Detail 1"
  }
}

我正在尝试将新的review添加到评论键，因此最终输出应如下所示，具体取决于餐厅的评论数：

{
  "restaurantName": "Restaurant 1",
  "restaurantLink": "Link 1",
  "restaurantType": "Type 1",
  "restaurantAddress": "Address 1",
  "dateRetrieved": "14-11-2018",
  "review": [
    {
      "reviewer": "Reviewer 1",
      "reviewDetail": "Review Detail 1"
    },
    {
      "reviewer": "Reviewer 2",
      "reviewDetail": "Review Detail 2"
    },{
      "reviewer": "Reviewer 3",
      "reviewDetail": "Review Detail 3"
    },
    ...
    ...
  ]
}

我当前的代码是：

for review in reviews:
  HungrygowhereItem['review'] = {
      [
        'reviewer': reviewer,
        'reviewDetail': reviewDetail
      ]
  }

HungrygowhereItem是现有词典的地方

它将仅存储Reviewer 1和Review Detail 1。如何将新列表添加到字典？

我发现了这个问题：Append items to dictionary，它与我的问题有关，但使用的语言不同。

Answer 1

首先，将键'review'的值作为列表。

>>> restaurant = {
...:  "restaurantName": "Restaurant 1",
...:  "restaurantLink": "Link 1",
...:  "restaurantType": "Type 1",
...:  "restaurantAddress": "Address 1",
...:  "dateRetrieved": "14-11-2018",
...:  "review": {
...:    "reviewer": "Reviewer 1",
...:    "reviewDetail": "Review Detail 1"
...:  }
...:}
>>> 
>>> restaurant['review'] = [restaurant['review']]
>>> restaurant['review']
>>> [{'reviewDetail': 'Review Detail 1', 'reviewer': 'Reviewer 1'}]

现在您可以追加到该列表。

>>> reviews = [{"reviewer": "Reviewer 2",
...:            "reviewDetail": "Review Detail 2"},
...:           {"reviewer": "Reviewer 3",
...:           "reviewDetail": "Review Detail 3"}]
...:           
>>> for review in reviews:
...:    restaurant['review'].append(review)
...:    
>>> restaurant['review']
>>> 
[{'reviewDetail': 'Review Detail 1', 'reviewer': 'Reviewer 1'},
 {'reviewDetail': 'Review Detail 2', 'reviewer': 'Reviewer 2'},
 {'reviewDetail': 'Review Detail 3', 'reviewer': 'Reviewer 3'}]

如果您可以在上游修复代码，也可以使restaurant成为defaultdict，而无需使用'review'键。

>>> from collections import defaultdict
>>> restaurant = {
...:  "restaurantName": "Restaurant 1",
...:  "restaurantLink": "Link 1",
...:  "restaurantType": "Type 1",
...:  "restaurantAddress": "Address 1",
...:  "dateRetrieved": "14-11-2018"
...:}
>>> 
>>> restaurant = defaultdict(list, restaurant)
>>> reviews = [{"reviewer": "Reviewer 1",
...:            "reviewDetail": "Review Detail1"},
...:           {"reviewer": "Reviewer 2",
...:            "reviewDetail": "Review Detail 2"},
...:           {"reviewer": "Reviewer 3",
...:           "reviewDetail": "Review Detail 3"}]
...:      
>>> restaurant['reviews'].extend(reviews)
>>> restaurant['reviews']
>>> 
[{'reviewDetail': 'Review Detail1', 'reviewer': 'Reviewer 1'},
 {'reviewDetail': 'Review Detail 2', 'reviewer': 'Reviewer 2'},
 {'reviewDetail': 'Review Detail 3', 'reviewer': 'Reviewer 3'}]

作为restaurant作为defaultdict的替代方案，您可以在添加任何评论之前将键'reviews'的值设置为空列表。

Answer 2

您必须从略有不同的review结构开始：

restaurant = {
  ...,
  "review": []
}

请注意，review是此处的列表。

因此，向该列表添加评论只是一个基本的列表操作：

restaurant['review'].append({
    "reviewer": "Reviewer 1",
    "reviewDetail": "Review Detail 1"
})

Answer 3

如果我对您的理解正确，则希望将值附加到现有字典中的数组中，因此，例如以下字典：

_dict = {
      "restaurantName": "Restaurant 1",
      "restaurantLink": "Link 1",
      "restaurantType": "Type 1",
      "restaurantAddress": "Address 1",
      "dateRetrieved": "14-11-2018",
      "review": [
        {
          "reviewer": "Reviewer 1",
          "reviewDetail": "Review Detail 1"
        },
        {
          "reviewer": "Reviewer 2",
          "reviewDetail": "Review Detail 2"
        },{
          "reviewer": "Reviewer 3",
          "reviewDetail": "Review Detail 3"
        }
      ]
    }

将价值附加到评论中

_dict['review'].append( {
          "reviewer": "Reviewer 4",
          "reviewDetail": "Review Detail 4"
        })

在您的情况下，如果HungrygowhereItem是字典：

for review in reviews:
  if 'review' in HungrygowhereItem:
      HungrygowhereItem['review'].append({
           'reviewer': reviewer,
           'reviewDetail': reviewDetail
       })
   else:
      HungrygowhereItem['review'] = [{
           'reviewer': reviewer,
           'reviewDetail': reviewDetail
       }]

将多个列表或项目添加到字典键

3 个答案: