Detailed explanation of Python json module

Json is a lightweight data interchange format. The so-called json is a data format: in Python it is actually a dictionary.

The json module has only 4 methods in total:

dumps, dumps, encodes Python objects into JSON strings
loads, load decode the encoded JSON string into a Python object 
where dump and load must pass in a file handle. dumps are only done serializing to str. 
Serialize to a string: Change all the original single quotes to double quotes. Then add a layer of single quotes outside

import json
dic1={'name':'zs','age':18}
dic2 = json.dumps(dic1)
 print (dic2)   # {"name": "zs", "age": 18} turned out to be single quotes 
print (json.loads(dic2)) # {'name': 'zs' , 'age': 18}

# json.dump() usage: the first step is to serialize it into a string, and the second step is to write it into the file 
import json
j={'name':'zs','age':33}
with open('test_json2','w')as f:
    json.dump(j,f,indent=4)

# Usage of json.load(): 
import json
with open('test_json2','r')as f:
    print(json.load(f))   #{'name': 'zs', 'age': 33}