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Python JSON File I/O: Writing and Reading JSON Objects, Lecture notes of Computer Programming

University of Southeastern Philippines (USEP)Computer Programming

How to write and read JSON objects in Python using the built-in json package. It covers the concepts of serialization and deserialization, and provides examples of using json.dumps() and json.dump() to write JSON to a file, as well as json.load() to read JSON from a file.

Typology: Lecture notes

2020/2021

Uploaded on 04/21/2022

franz-natayada
franz-natayada 🇵🇭

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Reading and Writing JSON to a File in Python
The full-form of JSON is JavaScript Object Notation. It means that a script
(executable) file which is made of text in a programming language, is used to store
and transfer the data. Python supports JSON through a built-in package called json.
To use this feature, we import the json package in Python script. The text in JSON is
done through quoted string which contains the value in key-value mapping within { }. It
is similar to the dictionary in Python.
Writing JSON to a file in python
Serializing JSON refers to the transformation of data into a series of bytes (hence
serial) to be stored or transmitted across a network. To handle the data flow in a file,
the JSON library in Python uses dump() or dumps() function to convert the Python
objects into their respective JSON object, so it makes easy to write data to files. See
the following table given below.
PYTHON OBJECT
JSON OBJECT
dict
object
list, tuple
array
str
string
int, long, float
numbers
True
true
False
false
None
null
Using json.dumps()
The JSON package in python has a function called json.dumps() that helps in
converting a dictionary to a JSON object.
It takes two parameters:
pf3
pf4
pf5

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Reading and Writing JSON to a File in Python The full-form of JSON is JavaScript Object Notation. It means that a script (executable) file which is made of text in a programming language, is used to store and transfer the data. Python supports JSON through a built-in package called json. To use this feature, we import the json package in Python script. The text in JSON is done through quoted string which contains the value in key-value mapping within { }. It is similar to the dictionary in Python. Writing JSON to a file in python Serializing JSON refers to the transformation of data into a series of bytes (hence serial) to be stored or transmitted across a network. To handle the data flow in a file, the JSON library in Python uses dump() or dumps() function to convert the Python objects into their respective JSON object, so it makes easy to write data to files. See the following table given below. PYTHON OBJECT JSON OBJECT dict object list, tuple array str string int, long, float numbers True true False false None null Using json.dumps() The JSON package in python has a function called json.dumps() that helps in converting a dictionary to a JSON object. It takes two parameters:

  1. dictionary – name of dictionary which should be converted to JSON object.
  2. indent – defines the number of units for indentation After converting dictionary to a JSON object, simply write it to a file using the “write” function. Example:

    Python program to write JSON

    to a file

    import json

    Data to be written

    dictionary ={ "name" : "sathiyajith", "rollno" : 56, "cgpa" : 8.6, "phonenumber" : "9976770500" }

    Serializing json

import json

Data to be written

dictionary ={ "name" : "sathiyajith", "rollno" : 56 , "cgpa" : 8. 6 , "phonenumber" : "9976770500" } with open("sample.json", "w") as outfile: json.dump(dictionary, outfile) Output: Reading JSON from a file using python Deserialization is the opposite of Serialization, i.e. conversion of JSON object into their respective Python objects. The load() method is used for it. If you have used JSON data from another program or obtained as a string format of JSON, then it can easily be deserialized with load(), which is usually used to load from string, otherwise, the root object is in list or dict. Using json.load() The JSON package has json.load() function that loads the json content from a json file into a dictionary. It takes one parameter:  File pointer: A file pointer that points to a JSON file.

Python program to read JSON

from a file

import json

Opening JSON file

with open('sample.json', 'r') as openfile:

Reading from json file

json_object = json.load(openfile) print(json_object) print(type(json_object)) Output: