尝试使用python 3加载JSON对象时出错 [英] Error while trying to load a JSON object with python 3

问题描述

我有以下要使用python 3解析的json对象:

I have the following json object I am trying to parse with python 3:

customerData = {   
 "Joe": {"visits": 1},  
 "Carol":  {"visits": 2},  
 "Howard": {"visits": 3},  
 "Carrie": {"visits": 4}  
}

我正在使用以下python代码来解析对象:

I am using the following python code to parse the object:

import json 

def greetCustomer(customerData):
    response = json.loads(customerData)

我遇到以下错误:

TypeError:JSON对象必须是str，字节或字节数组，而不是'dict'

TypeError: the JSON object must be str, bytes or bytearray, not 'dict'

推荐答案

customerData = {   
 "Joe": {"visits": 1},  
 "Carol":  {"visits": 2},  
 "Howard": {"visits": 3},  
 "Carrie": {"visits": 4}  
}

是定义字典的Python代码.如果你有

is Python code that defines a dictionary. If you had

customerJSON = """{   
 "Joe": {"visits": 1},  
 "Carol":  {"visits": 2},  
 "Howard": {"visits": 3},  
 "Carrie": {"visits": 4}  
}"""

您将拥有一个包含要解析的JSON对象的字符串. (是的，Python语法和JSON语法之间有很多重叠之处.

you would have a string that contains a JSON object to be parsed. (Yes, there is a lot of overlap between Python syntax and JSON syntax.

assert customerData == json.loads(customerJSON)

可以通过.

不过请注意，并非 all 个有效的Python都类似于有效的JSON.

Note, though, that not all valid Python resembles valid JSON.

以下是对同一对象进行编码的三种不同的JSON字符串:

Here are three different JSON strings that encode the same object:

json_strs = [
 "{'foo': 'bar'}",  # invalid JSON, uses single quotes
 '{"foo": "bar"}',  # valid JSON, uses double quotes
 '{foo: "bar"}'     # valid JSON, quotes around key can be omitted
]

您可以观察到all(json.loads(x) == {'foo': 'bar'} for x in json_strs)是真实的，因为所有三个字符串都编码相同的Python字典.

You can observe that all(json.loads(x) == {'foo': 'bar'} for x in json_strs) is true, since all three strings encode the same Python dict.

相反，我们可以定义三个Python字典，其中前两个是相同的.

Conversely, we can define three Python dicts, the first two of which are identical.

json_str = json_strs[0]  # Just to pick one
foo = ...  # Some value
dicts = [
  {'foo': 'bar'},     # valid Python dict
  {"foo": "bar"},     # valid Python dict
  {foo: "bar"}        # valid Python dict *if* foo is a hashable value
                      # and not necessarily 
]

dicts[0] == dicts[1] == json.loads(json_str)确实是.然而， dicts[2] == json.loads(json_str)仅在foo == "foo"时为真.

It is true that dicts[0] == dicts[1] == json.loads(json_str). However, dicts[2] == json.loads(json_str) is only true if foo == "foo".

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