轉載請注明出處：https://www.cnblogs.com/shapeL/p/9037670.html

由上篇文章（python3+requests：get/post請求）涉及到的json.dumps()擴展

1.json.dumps()用於將dict類型的數據轉成str

備注：文件路徑前面加上 r 是為了避免轉義

import json

dict = {'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
string = json.dumps(dict)
print(dict)
print(string)
print(type(dict))
print(type(string))

with open(r'C:\Users\zy\Documents\GitHub\python3\searchTest\json.json','w')as f:
f.write(string)

 

1 {'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
2 {"a": "wo", "b": "zai", "c": "zhe", "d": "li"}
3 <class 'dict'>
4 <class 'str'>

如果沒有進行轉換，則會報錯：TypeError: write() argument must be str, not dict

 

1 import json
2 
3 dict = {'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
4 with open(r'C:\Users\zy\Documents\GitHub\python3\searchTest\json.json','w')as f:
5     f.write(dict)

{'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
Traceback (most recent call last):
<class 'dict'>
File "C:/Users/zy/Documents/GitHub/python3/searchTest/json_test.py", line 11, in <module>
f.write(dict)
TypeError: write() argument must be str, not dict

 json.dumps()參數解釋：常用參數解釋

indent：應該是一個非負的整型，如果是0，或者為空，則一行顯示數據；否則會換行且按照indent的數量顯示前面的空白

sort_keys：將數據根據keys的值進行排序

 

1 response = requests.post(url=url,headers=headers).json()
2 print(json.dumps(response,sort_keys=True,indent=4))

舉例結果：

{
"code": "200",
"message": "",
"redirect": "",
"value": {
"name": "so",
"title": "360",
"value": "2"
}
}

 

2.json.loads():用於將str類型的數據轉成dict

dict = {'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
dumps = json.dumps(dict)
loads = json.loads(dumps)

print(dict)
print(dumps)
print(loads)

print(type(dict))
print(type(dumps))
print(type(loads))

{'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
{"a": "wo", "b": "zai", "c": "zhe", "d": "li"}
{'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
<class 'dict'>
<class 'str'>
<class 'dict'>

 

3.json.dump()用於將dict類型的數據轉成str，並寫入到json文件中

 

1 dict = {'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
2 json.dump(dict,open(r'C:\Users\zy\Documents\GitHub\python3\searchTest\json.json','w'))

 

4.json.load()用於從json文件中讀取數據

 

1 filename = (r'C:\Users\zy\Documents\GitHub\python3\searchTest\json.json')
2 jsObj = json.load(open(filename))
3 print(jsObj)
4 print(type(jsObj))

 

1 {'a': 'wo', 'b': 'zai', 'c': 'zhe', 'd': 'li'}
2 <class 'dict'>