如何从分隔字符串列表中获取不同的列表

def get_unique_lists(string_list, delimiter):
    unique_list = []
    for string in string_list:
        # 按照指定的分隔符拆分字符串
        substrings = string.split(delimiter)
        for substring in substrings:
            # 判断字符串是否已经存在于空列表中
            if substring not in unique_list:
                unique_list.append(substring)
    return unique_list

string_list = ['apple,banana,orange', 'banana,grape', 'orange,apple']

unique_list = get_unique_lists(string_list, ',')
print(unique_list)

['apple', 'banana', 'orange', 'grape']