That's good, and I want to be clear that I'm not accusing you of having the negative traits. I'm just saying that when you give that answer, you don't know how it will be heard. And some interviewers will hear that answer in a very bad way.

The potential for harm is mitigated a lot if you have already discussed your willingness to work with Python in other circumstances. But if the job they envision is 70% Python and 30% Perl, you've still potentially argued yourself out of a job for a skill that you realistically could come up to speed on well within the usual window of 1-3 months that most people need to become productive.