Bob Kline <bkl...@rksystems.com> added the comment:

Thanks, I understand. However, this highlights something which had slipped 
under my radar. You get one shot at running a code set through the tool. You 
can't do what I was doing, which was to run the tool in "don't write" mode, 
then fix by hand some of the things it says will need to be done, then run it 
again in the same mode, fix, etc., until I got to the point where I felt like I 
could trust it (except for things like adding unnecessary `list()` wrappers, 
for which I learned how to use the option for suppressing certain default 
fixers), and then run the tool in write mode to fix what was left. I now 
totally get why the tool did what it did, and why the approach I was using was 
inappropriate, but was there a warning to this effect that I missed in the 
documentation? Something like "you can only run this tool once per fixer (or 
set of fixers) in write mode, and you cannot run a fixer on code for which you 
have performed any of the needed conversions for that fixer yourself"? Of cour
 se, it's always possible I'm the only developer clueless enough not to have 
figured this out without such a warning. :-)

Partly in my (lame) defense, I had lured myself into the frame of mind where 
what I was doing seemed to make sense by having just come out of a similar 
exercise with pylint, where iterative "fixing" works just fine. I guess I 
should take this as a good sign, that my brain has moved so far into the Python 
3 world that "..." was no longer recognizable as a bytestring.

Again, thanks for the gentle explanation. :-)

----------

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<https://bugs.python.org/issue37996>
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