What meaning of this ""hello %s you are %s years old" % x"

fl rxjwg98 at gmail.com
Sun Jul 27 20:49:14 CEST 2014


I get a post on tuple, see below please, on line. It seems that something is 
missing. I want to learn tuple from this example as well.

Could you explain it to me (a tuple % another tuple)?



In Python, when should you use lists and when tuples?

Sometimes you don't have a choice, for example if you have

"hello %s you are %s years old" % x
then x must be a tuple.

But if I am the one who designs the API and gets to choose the data types, then 
what are the guidelines?

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