我最近使用的Train状态API在JSON对象中添加了两个额外的键值对(has_arrived,has_departed),这导致我的脚本崩溃.

这是字典：

{

"response_code": 200,

"train_number": "12229",

"position": "at Source",

"route": [

{

"no": 1,

"has_arrived": false,

"has_departed": false,

"scharr": "Source",

"scharr_date": "15 Nov 2015",

"actarr_date": "15 Nov 2015",

"station": "LKO",

"actdep": "22:15",

"schdep": "22:15",

"actarr": "00:00",

"distance": "0",

"day": 0

},

{

"actdep": "23:40",

"scharr": "23:38",

"schdep": "23:40",

"actarr": "23:38",

"no": 2,

"has_departed": false,

"scharr_date": "15 Nov 2015",

"has_arrived": false,

"station": "HRI",

"distance": "101",

"actarr_date": "15 Nov 2015",

"day": 0

}

]

}

毫不奇怪,我收到以下错误：

Traceback (most recent call last):

File "", line 1, in

NameError: name 'false' is not defined

如果我没有弄错,我认为这是因为JSON响应中的布尔值为false / true,而Python识别为False / True.

它有什么办法吗？

PS：我尝试将has_arrived的JSON响应转换为字符串,然后将其转换回布尔值,但发现如果字符串中有任何字符,我将始终获得True值.

我有点被困在这里.

解决方法:

尽管Python的对象声明语法与Json语法非常相似,但它们是截然不同且不兼容的.除了True / true问题,还有其他问题(例如Json和Python处理日期的方式非常不同,而python允许注释而Json没有).

而不是试图将它们视为同一个东西,解决方案是根据需要从一个转换为另一个.

Python的json库可用于在字符串中解析(读取)Json并将其转换为python对象…

data_from_api = '{...}' # data_from_api should be a string containing your json

info = json.loads(data_from_api)

# info is now a python dictionary (or list as appropriate) representing your Json

你也可以将python对象转换为json …

info_as_json = json.dumps(info)

例：

# Import the json library

import json

# Get the Json data from the question into a variable...

data_from_api = """{

"response_code": 200,

"train_number": "12229",

"position": "at Source",

"route": [

{

"no": 1, "has_arrived": false, "has_departed": false,

"scharr": "Source",

"scharr_date": "15 Nov 2015", "actarr_date": "15 Nov 2015",

"station": "LKO", "actdep": "22:15", "schdep": "22:15",

"actarr": "00:00", "distance": "0", "day": 0

},

{

"actdep": "23:40", "scharr": "23:38", "schdep": "23:40",

"actarr": "23:38", "no": 2, "has_departed": false,

"scharr_date": "15 Nov 2015", "has_arrived": false,

"station": "HRI", "distance": "101",

"actarr_date": "15 Nov 2015", "day": 0

}

]

}"""

# Convert that data into a python object...

info = json.loads(data_from_api)

print(info)

第二个例子展示了True / true转换的发生方式.另请注意引用的更改以及如何删除注释…

info = {'foo': True, # Some insightful comment here

'bar': 'Some string'}

# Print a condensed representation of the object

print(json.dumps(info))

# Or print a formatted version which is more human readable but uses more bytes

print(json.dumps(info, indent=2))

输出：

{"bar": "Some string", "foo": true}

{

"bar": "Some string",

"foo": true

}

标签：python,json,dictionary,boolean

来源： https://codeday.me/bug/20191004/1851821.html