Can you quickly learn enough to teach someone? If you're teaching them a general computer-science/programming subject where Python merely happens to be the medium, then maybe. But if you're teaching Python itself, then no. Python is different enough from all the languages you've mentioned that you wouldn't be able to do justice to it. For me, it took about 1-2 years before I considered myself an intermediate-to-advanced programmer.
Even now, 4 years since I first picked it up, I don't think I could teach an exhaustive course on Python without substantial preparation. For example, I've never built my own multiple inheritance hierarchy in Python, so I don't quite know what the method resolution order is (I know roughly how things are resolved, but not having ever needed to do it, I would need to experiment to be comfortable enough to teach it). If I had to teach, for the first time, a course on Python, I would need at least a month's preparation, perhaps even more.
Of course, this doesn't mean you can't help someone with their Python, just that you shouldn't aim to be their only instructor in the language, since it would be profoundly unfair to both the student and yourself.