Python: Dictionary changed size during iteration"

Asked Jan 23 '15 at 08:13

Active Jan 23 '15 at 08:31

Viewed 127 times

The following python snippet results in a "dictionary changed size during iteration" error. But I do not modify the dictionary at all. Any help would be appreciated.

for key1 in d1:
    key2 = d1[key1]
    for keys in key2:
        values = d1[keys]
        if( key1 in values):
            print '\n\n', key1, keys, '\n'

ERROR:

Traceback (most recent call last):
      File "C:/Nandita/Python/remove_duplicates.py", line 12, in <module>
        for key1 in d1:
    RuntimeError: dictionary changed size during iteration

EDIT: d1 looks like this

1: 2, 4
2: 4, 7, 9
4: 1, 2, 5
6: 1, 7

edited Jan 23 '15 at 08:24

asked Jan 23 '15 at 08:13

Nandita Damaraju

Can you post more info about d1? – lqhcpsgbl Jan 23 '15 at 08:18
What the input data? It works fine with `d1 = {'x':'y', 'y':'x','z':'y'}`. – John Zwinck Jan 23 '15 at 08:18
It looks like there is more codes above there, are you sure you are not modfying it? – GLHF Jan 23 '15 at 08:20
2

You're not using a `defaultdict` by any chance? – Wolph Jan 23 '15 at 08:22
I am using a defaultdict, how does that affect things? – Nandita Damaraju Jan 23 '15 at 08:25

Python: Dictionary changed size during iteration"

0 Answers0