倾倒泡菜不适用于rb +

Question

为什么pickle文件没有被修改？但是在我取消注释它之后它会起作用吗？

with open(PATH, "rb+") as fp:
    mocks_pickle = pickle.load(fp)
    mocks_pickle['aa'] = '123'
    # pickle.dump(mocks_pickle, open(PATH, 'wb'))
    pickle.dump(mocks_pickle, fp)

Answer 1

在转储对象之前，您需要使用fp.seek(0)搜索文件的开头。

如果您没有寻求将新的泡菜附加到文件的末尾。 当你从文件中pickle.load时，你只得到文件中的第一个。

with open(PATH, "rb+") as fp:
    mocks_pickle = pickle.load(fp)
    mocks_pickle['aa'] = '123'
    fp.seek(0)
    pickle.dump(mocks_pickle, fp)