Python: is using "..%(var)s.." % locals() a good practice?

I discovered this pattern (or anti-pattern) and I am very happy with it.

I feel it is very agile:

def example():
    age = ...
    name = ...
    print "hello %(name)s you are %(age)s years old" % locals()

Sometimes I use its cousin:

def example2(obj):
    print "The file at %(path)s has %(length)s bytes" % obj.__dict__

I don't need to create an artificial tuple and count parameters and keep the %s matching positions inside the tuple.

Do you like it? Do/Would you use it? Yes/No, please explain.