How do I deal with a dictionary of objects that is constantly changing in Python?

Question

The current situation: I'm using Discord's API to retrieve a dictionary of member objects in my server. This dictionary is constantly changing in size as new members join and old members leave.

I currently have a program that has a run time of around 30 minutes and accesses this dictionary of member objects so it's guaranteed that this dictionary changes size as I iterate over it in my program; this causes an error in my for loop. I also can't seem to deepcopy this dictionary;

TypeError: can't pickle dict_values objects

Any ideas of how I can work around this problem?

Code:
for i in members: do something; <--- while this is happening members changes in size
Trying this also doesn't work:
temp = copy.deepcopy(members)
This is what the dict is: dict_values([ <discord.member.Member object at 0x1094b3268 >, <discord.member.Member object at 0x1094b32f0 >, etc

Answer 1

这是我最终解决问题的方式：
temp = copy.deepcopy(list(members))