Python: Store a given dictionary in a json file

Last update on April 21 2025 12:59:52 (UTC/GMT +8 hours)

39. Store Dictionary Data in a JSON File

Write a Python program to store dictionary data in a JSON file.

Sample Solution:

Python Code:

# Create a dictionary 'd' containing information about students and teachers as a list of dictionaries.
d = {
    "students": [
        {"firstName": "Nikki", "lastName": "Roysden"},
        {"firstName": "Mervin", "lastName": "Friedland"},
        {"firstName": "Aron", "lastName": "Wilkins"}
    ],
    "teachers": [
        {"firstName": "Amberly", "lastName": "Calico"},
        {"firstName": "Regine", "lastName": "Agtarap"}
    ]
}

# Print a message indicating the start of the code section and the original dictionary.
print("Original dictionary:")
print(d)

# Print the data type of the 'd' dictionary.
print(type(d))

# Import the 'json' module to work with JSON data.
import json

# Create a new JSON file named "dictionary" and write the 'd' dictionary to it with formatting.
with open("dictionary", "w") as f:
    json.dump(d, f, indent=4, sort_keys=True)

# Print a message indicating the start of the next code section.
print("\nJson file to dictionary:")

# Open the "dictionary" JSON file and read its contents into the 'data' variable.
with open('dictionary') as f:
    data = json.load(f)

# Print the 'data' dictionary containing the JSON data from the file.
print(data)

Sample Output:

Original dictionary:
{'students': [{'firstName': 'Nikki', 'lastName': 'Roysden'}, {'firstName': 'Mervin', 'lastName': 'Friedland'}, {'firstName': 'Aron ', 'lastName': 'Wilkins'}], 'teachers': [{'firstName': 'Amberly', 'lastName': 'Calico'}, {'firstName': 'Regine', 'lastName': 'Agtarap'}]}
<class 'dict'>

Json file to dictionary:
{'students': [{'firstName': 'Nikki', 'lastName': 'Roysden'}, {'firstName': 'Mervin', 'lastName': 'Friedland'}, {'firstName': 'Aron ', 'lastName': 'Wilkins'}], 'teachers': [{'firstName': 'Amberly', 'lastName': 'Calico'}, {'firstName': 'Regine', 'lastName': 'Agtarap'}]}

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to write a dictionary to a JSON file with proper formatting and indentation.
Write a Python program to convert a dictionary to a JSON string and then save it to a file.
Write a Python program to implement error handling while saving dictionary data into a JSON file.
Write a Python program to read a dictionary from a JSON file and print its contents in a formatted manner.

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