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This article mainly introduces "how to convert Python strings into JSON". In daily operation, I believe many people have doubts about how to convert Python strings into JSON. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "how to convert Python strings into JSON". Next, please follow the editor to study!

What is JSON?

JSON is an abbreviation for JavaScript Object Notation (JavaScript object markup).

It is a data format used to store and transfer information for Web applications.

JSON originally came from the JavaScript programming language, but it is not limited to just one language.

Most modern programming languages have libraries for parsing and generating JSON data.

Where to use JSON

JSON is mainly used to send and receive data between the server and the client, where the client is a web page or Web application.

This is a more reliable format in the request-response cycle that Web applications use when connecting over the network. JSON is a more widely used format than XML, which is complex and less compact.

Basic JSON syntax

In JSON, data is written as key-value pairs, as follows:

"first_name": "Katie"

The data is enclosed in double quotation marks and the key-value pairs are separated by colons.

There can be multiple key-value pairs, each separated by a comma:

"first_name": "Katie", "last_name": "Rodgers"

The above example shows an object, a collection of multiple key-value pairs.

The object is in curly braces:

{"first_name": "Katie", "last_name": "Rodgers"}

You can also use JSON to create an array, an ordered list of values. In this case, the array is enclosed in square brackets:

[{"first_name": "Katie", "last_name": "Rodgers"}, {"first_name": "Naomi", "last_name": "Green"},] / or: {"employee": [{"first_name": "Katie", "last_name": "Rodgers"} {"first_name": "Naomi", "last_name": "Green"},]} / / this created an 'employee' object that has 2 records.// It defines the first name and last name of an employee how to process JSON data in Python

Include JSON module

To use JSON in Python, you first need to include the JSON module at the top of the Python file. This is built into Python and is part of the standard library.

So suppose you have a file called demo.py. At the top, you will add the following lines:

Import json uses the json.loads () function

If you have JSON string data in your program, it looks like this:

# include json libraryimport json # json string dataemployee_string ='{"first_name": "Michael", "last_name": "Rodgers", "department": "Marketing"}'# check data type with type () methodprint (type (employee_string)) # output#

You can use the json.loads () function to convert it to JSON in Python.

The json.loads () function takes a valid string as input and converts it to an Python dictionary.

This process is called deserialization-- converting strings into objects.

# include json libraryimport json # json string dataemployee_string ='{"first_name": "Michael", "last_name": "Rodgers", "department": "Marketing"}'# check data type with type () methodprint (type (employee_string)) # convert string to objectjson_object = json.loads (employee_string) # check new data typeprint (type (json_object)) # output#

You can then access each individual item, just as you would when using the Python dictionary:

# include json libraryimport json # json string dataemployee_string ='{"first_name": "Michael", "last_name": "Rodgers", "department": "Marketing"}'# check data type with type () methodprint (type (employee_string)) # convert string to objectjson_object = json.loads (employee_string) # check new data typeprint (type (json_object)) # output# # access first_name in dictionaryprint (json_object ["first_name"]) # output#Michael

Let's give another example:

1. Fetch some JSON string data

Import json # json stringemployees_string =''{"employees": [{"first_name": "Michael", "last_name": "Rodgers", "department": "Marketing"}, {"first_name": "Michelle", "last_name": "Williams" "department": "Engineering"}]}''# check data type using the type () methodprint (type (employees_string)) # output#

two。 Use the json.loads () function to convert a string to an object

Import json emoloyees_string ='{"employees": [{"first_name": "Michael", "last_name": "Rodgers", "department": "Marketing"}, {"first_name": "Michelle", "last_name": "Williams" "department": "Engineering"}}''data = json.loads (employees_string) print (type (data)) # output#

3. Read data

Import json employees_string ='{"employees": [{"first_name": "Michael", "last_name": "Rodgers", "department": "Marketing"}, {"first_name": "Michelle", "last_name": "Williams" "department": "Engineering"}}''data = json.loads (employees_string) print (type (data)) # output# # access first_namefor employee in data ["employees"]: print (employee ["first_name"]) # output#Michael#Michelle here The study on "how to convert Python strings to JSON" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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