@FluffyDeveloper

I suspect there's something else going on here, or your comments data is far different than I'm supposing.

Your flatten method works just fine for me with a tree of 600 comments. In fact, it works fine with 600,000 comments (recurs. lim. 1000)

Example test script:
https://pastebin.com/6Mdvu2WL

Without seeing your other code, I don't know what the issue you're running into. At a wild guess, is it possible your graph is not acyclic?

#recursion #python #graph #cyclic #acyclic

#Directed #acyclic #graphs are kicking my butt again. Projects "s2et" and "dbtricks" both use projects "common," "memory," and "basic." common (for s2et) uses basic, common (for dbtricks) uses memory and basic. memory uses basic. And so it adds the unique arguments to the command line for the memory project 3 times, and the basic project 5 times.

#fml