input: Write a function to parse a JSON data structure and extract the 'name', 'age', and 'occupation' keys.
  
  def parse_json(data):
   data = json.loads(data)
   return data['name'], data['age'], data['occupation']
  
  assert parse_json('{"name": "John", "age": 18, "occupation": "Software Engineer"}')==('John', 18, 'Software Engineer')
  assert parse_json('{"name": "Alice", "age": 25, "occupation": "Data Scientist"}')==('Alice', 25, 'Data Scientist')
  assert parse_json('{"name": "Bob", "age": 30, "occupation": "Teacher"}')==('Bob', 30, 'Teacher')
  assert parse_json('{"name": "Charlie", "age": 22, "occupation": "Student"}')==('Charlie', 22, 'Student')
  assert parse_json('{"name": "David", "age": 35, "occupation": "Doctor"}')==('David', 35, 'Doctor')
output: def parse_json(data):
      data = json.loads(data)
      return data['name'], data['age'], data['occupation']