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import json
import sys

def extract_addresses(json_data, output_filename="addresses.txt"):
    """Extracts server addresses from JSON data and writes them to a text file.

    Args:
        json_data: The JSON object containing the server data.
        output_filename: The name of the output text file (default: addresses.txt).
    """
    try:
        data = json_data.get("Data", [])

        with open(output_filename, 'w', encoding='utf-8') as outfile:
            for server in data:
                address = server.get("Address")
                if address:
                    outfile.write(address.strip() + '\n')


    except (IOError, json.JSONDecodeError) as e:
        print(f"An error occurred: {e}")


if __name__ == "__main__":
    if len(sys.argv) > 1:
        json_filename = sys.argv[1]

        try:
            with open(json_filename, 'r', encoding='utf-8') as f:
                json_data = json.load(f)

        except FileNotFoundError:
            print(f"Error: File '{json_filename}' not found.")
            sys.exit(1)
        except json.JSONDecodeError:
            print(f"Error: Invalid JSON format in '{json_filename}'.")
            sys.exit(1)


        if len(sys.argv) > 2:
            output_filename = sys.argv[2]
            extract_addresses(json_data, output_filename)
            print(f"Addresses extracted to '{output_filename}'")

        else:
            extract_addresses(json_data)
            print("Addresses extracted to 'addresses.txt'")



    else:
        print("Usage: python script_name.py <json_filename> <output_filename>(optional)")
        default_json = {"Data": []}
        extract_addresses(default_json)
        print("Addresses (from default JSON) extracted to 'addresses.txt'")