Question

我正在尝试通过python中的循环和条件语句来获取json文件的内容。

这是JSON文件内容：

{
    "count": 3,
    "result": [
        {
            "type": "first",
            "first": {
                "_links": {
                    "self1": {
                        "href": "/c6a5c1db-cf6e-4b12-9944-a1b6451963d4"
                    },
                    "self2": {
                        "href": "https://example.com"
                    },
                    "ver": {
                        "href": "https://example1.com"
                    }
                },
                "id": "c6a5c1db-cf6e-4b12-9944-a1b6451963d4",
                "tags": []
            }
        },
        {
            "type": "year",
            "year": {
                "month": {
                    "api1": {
                        "href": "https://Ap1.com"
                    },
                    "api2": {
                        "href": "FETCH-CONTENT"
                    },
                    "api3": {
                        "href": "https://Ap3.com"
                    },
                    "api4": {
                        "href": "https://Ap4.com"
                    }
                },
                "idProvider": {
                    "id": "sfsmkfmskf",
                    "name": "Apikey"
                },
                "tags": []
            }
        },
        {
            "type": "year",
            "year": {
                "month": {
                    "api1": {
                        "href": "https://Ap11.com"
                    },
                    "api2": {
                        "href": "FETCH-CONTENT-1"
                    },
                    "api3": {
                        "href": "https://Ap13.com"
                    },
                    "api4": {
                        "href": "https://Ap14.com"
                    }
                },
                "identityProvider": {
                    "id": "00000000-0000-0000-0000-000000000000",
                    "name": ""
                },
                "tags": []
            }
        }
    ]
}

我正在尝试从第一个对象访问self2 href，并从第二个和第三个对象访问api3 href_1。如果没有第一个对象，我将能够访问api3 href_1并打印所需的密钥。

但是，当我通过传递完整文件来打印内容时，它无法打印内容。因为它没有为所有对象获得相同的键名称。

要打印

print([item['year']['month']['api3'] for item in data['result']])

如果json文件不包含结果数组的第一个元素，则以上行将打印所需的数据。当我添加结果数组的第一个元素时，它不会给出任何结果。

Answer 1

使用以下语句忽略具有"type": "first"的项目。有用。

print([item['year']['month']['api3'] for item in data['result'] if "year" in item])

您可以在下面的示例中看到它。

>>> data = {
... "count": 3,
... "result": [
...     {
...         "type": "first",
...         "first": {
...             "_links": {
...                 "self1": {
...                     "href": "/c6a5c1db-cf6e-4b12-9944-a1b6451963d4"
...                 },
...                 "self2": {
...                     "href": "https://example.com"
...                 },
...                 "ver": {
...                     "href": "https://example1.com"
...                 }
...             },
...             "id": "c6a5c1db-cf6e-4b12-9944-a1b6451963d4",
...             "tags": []
...         }
...     },
...     {
...         "type": "year",
...         "year": {
...             "month": {
...                 "api1": {
...                     "href": "https://Ap1.com"
...                 },
...                 "api2": {
...                     "href": "FETCH-CONTENT"
...                 },
...                 "api3": {
...                     "href": "https://Ap3.com"
...                 },
...                 "api4": {
...                     "href": "https://Ap4.com"
...                 }
...             },
...             "idProvider": {
...                 "id": "sfsmkfmskf",
...                 "name": "Apikey"
...             },
...             "tags": []
...         }
...     },
...     {
...         "type": "year",
...         "year": {
...             "month": {
...                 "api1": {
...                     "href": "https://Ap11.com"
...                 },
...                 "api2": {
...                     "href": "FETCH-CONTENT-1"
...                 },
...                 "api3": {
...                     "href": "https://Ap13.com"
...                 },
...                 "api4": {
...                     "href": "https://Ap14.com"
...                 }
...             },
...             "identityProvider": {
...                 "id": "00000000-0000-0000-0000-000000000000",
...                 "name": ""
...             },
...             "tags": []
...         }
...     }
... ]}
>>> 
>>> print([item['year']['month']['api3'] for item in data['result'] if "year" in item])
[{'href': 'https://Ap3.com'}, {'href': 'https://Ap13.com'}]
>>>

Answer 2

您只需要选择正确类型的记录即可，例如在理解中使用if，例如：

print([item['year']['month']['api3'] for item in data['result'] 
       if item['type'] == 'year'])

测试代码：

data = {
    "count": 3,
    "result": [
        {
            "type": "first",
            "first": {
                "_links": {
                    "self1": {
                        "href": "/c6a5c1db-cf6e-4b12-9944-a1b6451963d4"
                    },
                    "self2": {
                        "href": "https://example.com"
                    },
                    "ver": {
                        "href": "https://example1.com"
                    }
                },
                "id": "c6a5c1db-cf6e-4b12-9944-a1b6451963d4",
                "tags": []
            }
        },
        {
            "type": "year",
            "year": {
                "month": {
                    "api1": {
                        "href": "https://Ap1.com"
                    },
                    "api2": {
                        "href": "FETCH-CONTENT"
                    },
                    "api3": {
                        "href": "https://Ap3.com"
                    },
                    "api4": {
                        "href": "https://Ap4.com"
                    }
                },
                "idProvider": {
                    "id": "sfsmkfmskf",
                    "name": "Apikey"
                },
                "tags": []
            }
        },
        {
            "type": "year",
            "year": {
                "month": {
                    "api1": {
                        "href": "https://Ap11.com"
                    },
                    "api2": {
                        "href": "FETCH-CONTENT-1"
                    },
                    "api3": {
                        "href": "https://Ap13.com"
                    },
                    "api4": {
                        "href": "https://Ap14.com"
                    }
                },
                "identityProvider": {
                    "id": "00000000-0000-0000-0000-000000000000",
                    "name": ""
                },
                "tags": []
            }
        }
    ]
}
print([item['year']['month']['api3'] for item in data['result']
       if item['type'] == 'year'])

结果：

[
    {'href': 'https://Ap3.com'}, 
    {'href': 'https://Ap13.com'}
]

Answer 3

尝试了几种组合后，下面的代码可以正常工作。

import json
with open('C:\python\examplee.json', 'r+') as fr:
     data = json.load(fr)
     for item in data['result']:
          if item['type']=='year':
                print([item['year']['month']['api3']['href']])
          else:
               print([item['first']['_links']['self2']['href']])

读取json并访问多个键

3 个答案:

测试代码：

结果：