如何做一个字典，用fifo程序给输出 [英] how to do a dictionary that give the output with a fifo process

问题描述

我正在搜索使用允许方法的字典的方法或库，例如: element_dict_in({'polo':789})和 element_dict_out()返回我放在字典中的第一个关系，我之前提到的2种方法是尚未实施，这是为了澄清我的想法:

i am searching a method or library that use a dict that allow method like: element_dict_in({'polo':789}),and element_dict_out() that return me the first relation that was put in the dictionary, the 2 method that i mentioned before are not implemented,it is for clarify my idea:

例如:

dict={}
element_dict_in({'polo1':789})
element_dict_in({'polo2':123})
element_dict_in({'polo3':4556})#{'polo1':789,'polo2':123,'polo3':4556}
element_dict_out()#return {'polo1':789}

我找到此链接 Python字典中FIFO顺序的方式但是对我来说还不够清楚，所以存在这样的东西吗?

i find this link pythonic way for FIFO order in Dictionary but for my it is not enough clear, so exist something like that?

推荐答案

Python实际上已经在标准库中提供了此功能-

Python actually already has this in the standard library - collections.OrderedDict.

from collections import OrderedDict

my_dict = OrderedDict()
my_dict['polo1'] = 789
my_dict['polo2'] = 123
my_dict['polo3'] = 4556

print(my_dict.popitem(last=False))
# ('polo1', 789)

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值得注意的是，内置的 dict 类型

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Notably, the built-in dict type can do LIFO popping but not FIFO popping if that's acceptable to you, and is generally faster than the OrderedDict for most things.

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