[FIXED] Why is this code to delete negative values from a dictionary not working?

Issue

I have to get rid of all the entries which have negative value. Why is my code not working?

dic = {'aa': 20, 'bb': -10, 'cc': -12}

for i in dic:
    if dic[i] < 0:
        del dic[i]
        
print(dic)

When running this code I get an exception:

RuntimeError: dictionary changed size during iteration

Solution

You can accomplish this by using dict comprehensions.

dic = {k: v for (k, v) in dic.items() if v >= 0}

Answered By - Steinar Lima