Python闪卡程序报AttributeError: 'str' object has no attribute 'write'求助

核心问题是变量名重复覆盖：
在write_flash_cards_to_text_file函数中，你首先通过open("./flash_cards.txt", "w+") as f将打开的文件对象赋值给了变量f，后续遍历闪卡字典的时候又写了for l, f in flash_cards.items()，这一步会把闪卡的定义值（字符串类型）重新赋值给f，覆盖了原本的文件对象。后续调用f.write()时，f已经是字符串，没有write方法，就触发了AttributeError。
而文件被清空是因为w+模式打开文件的第一时间就会清空原有内容，这一步发生在遍历写操作之前，所以哪怕后续代码报错，文件也已经被清空了。

1. 首先修改write_flash_cards_to_text_file函数的遍历变量名，避免和文件对象变量冲突：

def write_flash_cards_to_text_file():
    """Will line by line write the name and definition for each flash card to a file for saving"""
    global flash_cards

    with open("./flash_cards.txt", "w+") as f:
        # 把遍历变量改成key、value，不要和文件对象f重名
        for key, value in flash_cards.items():
            f.write(key + "=" + value + "\n")

2. 补充update_flash_cards函数的新增/修改逻辑，当前版本只处理了删除场景，没有把新闪卡写入字典：

def update_flash_cards(key, values, save_to_file=True, delete_flash_card=False):
    """Will be called whenever adding or deleting or replacing a flash card"""
    global flash_cards
    if delete_flash_card:
        del flash_cards[key]
    else:
        # 新增/更新闪卡的逻辑
        flash_cards[key] = values

    if save_to_file:
        write_flash_cards_to_text_file()

内容的提问来源于stack exchange，提问作者EvaIgoria