字典在迭代过程中更改大小 [英] Dictionary changes size during iteration

问题描述

我浏览了与该主题相关的答案的数据库，找不到答案，本质上是我在浏览字典，得到字典更改大小，运行时错误，但我却突然弹出取出一个键和值，并在迭代恢复之前插入另一个键和值。

I looked through the database of answers pertaining to this topic and couldn't find an answer, essentially I'm looping through a dictionary, I'm getting the, "dictionary changes size," runtime error yet I'm popping out one key and value and inserting another before the iteration resumes.

       for patterns in dict_copy.keys():
            new_tuple = ()
            for items in range(len(patterns)):
                if patters[items] not in exclusion:
                    new_tuple += (patterns[items],)
            dict_copy[new_tuple] = dict_copy.get(patterns)
            dict_copy.pop(patterns)

我正在使用的词典的格式为：{ （ A， B， C， D）：4，（ B， A， C， D） 2 ...}
我是它认为我正在改变字典的大小这一事实几乎使我感到困惑

The dictionaries I'm working with are in the form: {("A","B","C","D"):4, ("B","A","C","D") "2...} I'm pretty much just confused over the fact that it thinks I'm chaning the dictionary size

推荐答案

我'm弹出一个键和值，然后在
迭代恢复之前插入另一个键和值。

I'm popping out one key and value and inserting another before the iteration resumes.

这没关系。您不能
Python的迭代器变得混乱（-：这与字典的大小无关，而是它的内容。
（在o中是相同的方式）还有其他编程语言...）

That does not matter. You cannot change a data structure while iterating it. Python's iterator gets confused (-: It's not about the size of the dictionary, but its content. (It's the same way in other programming languages too...)

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