How to add a key-value to JSON data retrieved from a file in python?

How to add a key-value to JSON data retrieved from a file in python?

To add a new key-value pair to JSON data retrieved from a file in Python, you'll need to follow these general steps:

  1. Read the JSON data from the file.
  2. Parse the JSON data into a Python dictionary.
  3. Add the new key-value pair to the dictionary.
  4. Convert the modified dictionary back to JSON format.
  5. Write the updated JSON data back to the file.

Here's an example:

import json # Read JSON data from file file_path = 'data.json' with open(file_path, 'r') as file: json_data = json.load(file) # Add a new key-value pair new_key = 'new_key' new_value = 'new_value' json_data[new_key] = new_value # Write the updated JSON data back to the file with open(file_path, 'w') as file: json.dump(json_data, file, indent=4) print(f'Added key-value pair: "{new_key}": "{new_value}"')

In this example, replace 'data.json' with the path to your JSON file. The code reads the JSON data from the file, adds a new key-value pair ('new_key' and 'new_value'), and then writes the modified JSON data back to the same file.

Please make sure you have a backup of your JSON file before modifying it, as incorrect changes can lead to data loss or corruption.

Examples

  1. "Python add key-value pair to JSON file"

    Description: This query seeks to learn how to add a new key-value pair to a JSON file using Python.

    import json # Open the JSON file with open('data.json', 'r') as file: data = json.load(file) # Add a new key-value pair data['new_key'] = 'new_value' # Write the updated JSON back to the file with open('data.json', 'w') as file: json.dump(data, file, indent=4)

  2. "How to append data to JSON file in Python"

    Description: This query aims to understand how to append new data to an existing JSON file.

    import json # Open the JSON file with open('data.json', 'r+') as file: data = json.load(file) # Add a new key-value pair data['new_key'] = 'new_value' # Move the file cursor to the start of the file file.seek(0) # Write the updated JSON back to the file json.dump(data, file, indent=4) # Truncate any remaining content (in case the new content is shorter) file.truncate()

  3. "Python modify JSON file"

    Description: This query is about modifying an existing JSON file using Python.

    import json # Open the JSON file with open('data.json', 'r+') as file: data = json.load(file) # Modify existing key's value or add a new key-value pair data['existing_key'] = 'modified_value' # Modify existing key data['new_key'] = 'new_value' # Add new key-value pair # Move the file cursor to the start of the file file.seek(0) # Write the updated JSON back to the file json.dump(data, file, indent=4) # Truncate any remaining content (in case the new content is shorter) file.truncate()

  4. "Python read and write JSON file"

    Description: This query is about both reading and writing JSON files in Python.

    import json # Read JSON file with open('data.json', 'r') as file: data = json.load(file) # Modify or add data data['new_key'] = 'new_value' # Write updated data back to the file with open('data.json', 'w') as file: json.dump(data, file, indent=4)

  5. "Python JSON file manipulation"

    Description: This query focuses on manipulating JSON files using Python.

    import json # Load existing JSON data with open('data.json', 'r') as file: data = json.load(file) # Modify or add data data['new_key'] = 'new_value' # Write updated data back to the file with open('data.json', 'w') as file: json.dump(data, file, indent=4)

  6. "Python add key-value pair to JSON object"

    Description: This query is about adding a new key-value pair to a JSON object in Python.

    import json # Open the JSON file with open('data.json', 'r') as file: data = json.load(file) # Add a new key-value pair data['new_key'] = 'new_value' # Write the updated JSON back to the file with open('data.json', 'w') as file: json.dump(data, file, indent=4)

  7. "Python manipulate JSON data"

    Description: This query is about manipulating JSON data using Python.

    import json # Open the JSON file with open('data.json', 'r+') as file: data = json.load(file) # Modify existing key's value or add a new key-value pair data['existing_key'] = 'modified_value' # Modify existing key data['new_key'] = 'new_value' # Add new key-value pair # Move the file cursor to the start of the file file.seek(0) # Write the updated JSON back to the file json.dump(data, file, indent=4) # Truncate any remaining content (in case the new content is shorter) file.truncate()

  8. "Python JSON file handling"

    Description: This query is about handling JSON files in Python.

    import json # Open the JSON file with open('data.json', 'r') as file: data = json.load(file) # Add a new key-value pair data['new_key'] = 'new_value' # Write the updated JSON back to the file with open('data.json', 'w') as file: json.dump(data, file, indent=4)

  9. "Python update JSON file"

    Description: This query aims to update an existing JSON file using Python.

    import json # Open the JSON file with open('data.json', 'r+') as file: data = json.load(file) # Modify existing key's value or add a new key-value pair data['existing_key'] = 'modified_value' # Modify existing key data['new_key'] = 'new_value' # Add new key-value pair # Move the file cursor to the start of the file file.seek(0) # Write the updated JSON back to the file json.dump(data, file, indent=4) # Truncate any remaining content (in case the new content is shorter) file.truncate()

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