I've been studying kendo for a few years (the martial art of the samurai sword, the katana) which is a nonlethal sport which is huge in Japan. I don't actually own a sword, but if I got into iaido I would have to get one to train with.
In either case, this is the first thing I learned about defending myself with one:
"If you are attacked and you happen to have a katana with you, drop it, and run as fast as you can the other way. The sword will just slow you down. That is the bet defense"
So no, it's not practical. And honestly, when would you have one with you? And where would you have room to swing it? I need a good 12 feet or so of headroom to practice in...and really, you're training to attack someone else who ALSO has a katana. Unless you're in feudal japan a few centuries ago, the odds of that happening are not very good. If you're trying to defend yourself, you need a pair of track shoes or a pistol, probably.
-John
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