Untitled

import json

# Assuming 'data' is the JSON data provided above
data = [
    # Insert your JSON data here
]

# Create a new dictionary with 'first_name_last_name' as key (using underscore) and 'email' as value
new_dict = {f"{user['first_name']}_{user['last_name']}": user['email'] for user in data}

print(new_dict)