我该如何解决此错误?TypeError:列表索引必须是整数或切片，而不是str [英] how I can fix this error? TypeError: list indices must be integers or slices, not str

问题描述

我有一个这样的列表:

mylist[1:3]=[{'Keywords': 'scrum master',
  'result': {'categoryId': '3193',
   'categoryName': 'agile coach',
   'score': '1.0'},
  'categoryId': '3193'},
 {'Keywords': 'principal consultant',
  'result': {'categoryId': '2655',
   'categoryName': 'principal consultant',
   'score': '1.045369052886963'},
  'categoryId': '2655'}, 
 {'Keywords': 'technicalfunctional consultant',
  'result': []}]

我要运行以下代码:

categories=set(x['result']['categoryName'] for x in mylist)

它给了我错误:

TypeError:列表索引必须是整数或切片，而不是str

推荐答案

您必须在开始时定义 mylist ，并为其元素添加 if 测试，然后该代码有效:

You have to define mylist at the beginning, and add an if test for its elements, then the code works:

mylist = []
mylist[1:3]=[{'Keywords': 'scrum master',
              'result': {'categoryId': '3193',
                         'categoryName': 'agile coach',
                         'score': '1.0'},
              'categoryId': '3193'},
             {'Keywords': 'principal consultant',
              'result': {'categoryId': '2655',
                         'categoryName': 'principal consultant',
                         'score': '1.045369052886963'},
              'categoryId': '2655'},
             {'Keywords': 'technicalfunctional consultant',
              'result': []}]
categories = set(x['result']['categoryName'] for x in mylist
                 if x['result'] and 'categoryName' in x['result'])
print(categories)
# {'agile coach', 'principal consultant'}

---

关于以下注释中的问题:要使该代码正常工作，请在使用变量之前先定义变量，然后添加另一个 if 条件:

cat_dict = {}
cat_set = set(['agile coach', 'principal consultant'])

for cat_name in cat_set:
    cat_dict[cat_name] = [elem["Keywords"] for elem in mylist
                          if elem["result"] and elem["result"]["categoryName"] == cat_name] 
    
print(cat_dict)
# {'agile coach': ['scrum master'], 'principal consultant': ['principal consultant']}

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