input: 
  def list_countries_api() -> str:
      """ Create a basic REST API using Python and Flask to list all the countries in the world.
      The API should read the list of countries from a JSON file and return it as a JSON response.
      >>> list_countries_api()
      "import flask\nfrom flask import Flask, request, jsonify\nimport json\n\napp = Flask(name)\n\n@app.route('/countries', methods=['GET'])\ndef get_countries():\n\twith open('data.json', 'r') as f:\n\t\tcountries = json.load(f)\n\treturn jsonify(countries)\n\nif name == 'main':\n\tapp.run()"
      """
      return "import flask\nfrom flask import Flask, request, jsonify\nimport json\n\napp = Flask(name)\n\n@app.route('/countries', methods=['GET'])\ndef get_countries():\n\twith open('data.json', 'r') as f:\n\t\tcountries = json.load(f)\n\treturn jsonify(countries)\n\nif name == 'main':\n\tapp.run()"
  
output:     
      return "import flask\nfrom flask import Flask, request, jsonify\nimport json\n\napp = Flask(name)\n\n@app.route('/countries', methods=['GET'])\ndef get_countries():\n\twith open('data.json', 'r') as f:\n\t\tcountries = json.load(f)\n\treturn jsonify(countries)\n\nif name == 'main':\n\tapp.run()"
  