[Twisted-Python] DeprecationWarning and PotentialZombieWarning

[exarkun at twistedmatrix.com]

On 07:58 pm, kmcintyre at greenchargenet.com wrote:
>I recently upgraded to 12.0.0 and was running my process in the shell,
>when this error/warning was thrown.  Any idea what it means?
>
>DeprecationWarning: twisted.internet.error.PotentialZombieWarning was
>deprecated in Twisted 10.0.0: There is no longer any potential for
>zombie process.

This attribute and others are deprecated.  APIs and behaviors are 
deprecated for at least two releases before they are removed or 
otherwise changed incompatibly.

I don't know what the line of code pointed at by the warning is from or 
is trying to do:
>o = getattr (m, sym)

Considering how many warnings it triggered, it looks like it may be some 
code that is traversing _all_ the APIs in Twisted?  Perhaps the warnings 
are harmless, then, since after we remove the deprecated APIs, the code 
will no longer see them and no longer try to visit them.

If that doesn't sound right, then it may help for you to further explain 
what was going on when you encountered these warnings.

Jean-Paul