Python работа с массивом?

self.__data[data[0]] = data[1]
TypeError: list indices must be integers or slices, not str

class Name:
   __data = []

   def __init__(self):
        my_string = open('text.txt')
        read = my_string.read().split('\n')

        for item in  read:
            data = item.split('-')

            self.__data[data[0]] = data[1]
            print(self.__data)