Python function to extract specific key value pair from json data.

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import json

def extract_key_value(json_data, key):
    """Extracts a specific key-value pair from a JSON data"""
    data = json.loads(json_data)
    value = data.get(key)
    return value

In this example, the function extract_key_value takes two arguments: json_data, which is a string containing JSON data, and key, which is the key for the value that you want to extract.

The function first uses the json.loads method to convert the json_data string into a Python dictionary. It then uses the dictionary method get to retrieve the value associated with the specified key. If the key is not found in the dictionary, the method returns None.

Here’s an example of how you could use this function:

# Example JSON data
json_data = '{"name": "John Doe", "age": 35, "city": "New York"}'

# Extract the value associated with the "age" key
age = extract_key_value(json_data, "age")

# Print the result
print(age) # Output: 35

In this example, the function is called with the json_data string and the key "age". The function returns the value associated with the "age" key in the JSON data, which is the integer 35. This value is then assigned to the variable age and printed to the console.