Haha! I tend to use lipsum.com for that, but it sure is tedious to do it one by one. However, I found this app his a stupid limitation, one has to define the columns manually before it generates anything! Come on - it should take in a CREATE TABLE command and understand by itself! I, the instant-gratification-addicted Web developer, demand it!
The schema will anyway be written by you in something like a models.php or db.php file anyway. You just need to import this for schema info and what remains is one line per table that needs to be run as many times as you need records.
In python, yes you can write a generic script for any ORM (though I haven't written one yet) quite easily because there are nice introspection functions. I use python REPL to populate the tables because I find that convenient enough.