pdkim | implements DKIM as specified in RFC4871
kandi X-RAY | pdkim Summary
kandi X-RAY | pdkim Summary
PDKIM - a RFC4871 (DKIM) implementation Copyright (C) 2009 Tom Kistner tom@duncanthrax.net. Includes code from the PolarSSL project. Copyright (C) 2009 Paul Bakker polarssl_maintainer@polarssl.org Copyright (C) 2006-2008 Christophe Devine.
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QUESTION
This problem arose when I was trying a depth-first approach of printing a disconnected graph.
I am using a defaultdict
for my adjacency list representation of the graph. I know that if a key isn't in the dictionary, the defaultdict
would add it and provide whatever default value you set (in my case a list
).
Before you comment this as a duplicate, I have read the posts here and here. They show that the dictionary is being changed during the iteration but I don't quite get how in my particular case. I am not popping any values from the defaultdict
.
The code is adapted from GeeksForGeeks but I decided to use a set
instead of a list
for visited vertices and I renamed the DFSUtil
function, DFSHelper
. Moreover, the graph being printed is the same as the one below except that I added a node 5 pointing to node 4. I tried to add this to make the graph truly disconnected. Without this additional entry, no error is produced.
Here's my code:
...ANSWER
Answered 2018-May-31 at 02:50When you get to the edge of 4 and 5, you go through the neighbors of 5 when the code reaches for neighbor in self.graph[vertex]
. The only neighbor of 5 is 4 and you then call the function recursively with 4 as the vertex. In the next call of the DFSHelper
, the defaultdict adds an entry for 4 because it's missing.
Just add your condition if vertex in self.graph
before the for-loop to avoid this error.
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