How to solve dictionary changed size during iteration error?

Question

I want pop out all the large values and its keys in a dictionary, and keep the smallest. Here is the part of my program

for key,value in dictionary.items():
         


        

Answer 1

You can use copy.deepcopy to make a copy of the original dict, loop over the copy while change the original one.

from copy import deepcopy

d=dict()
for i in range(5):
    d[i]=str(i)

k=deepcopy(d)

d[2]="22"
print(k[2])
#The result will be 2.

Your problem is iterate over something that you are changing.

Answer 2

Record the key during the loop and then do dictionary.pop(key) when loop is done. Like this:

for key,value in dictionary.items():
    for key1, value1 in dictionary.items(): 
            if key1!= key and value > value1:
                storedvalue = key
    dictionary.pop(key)