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Functions: *args
>>> def concat(*args, sep="/"):
... return sep.join(args)
...
>>> concat("earth", "mars", "venus")
'earth/mars/venus'
>>> concat("earth", "mars", "venus", sep=".")
'earth.mars.venus'- used when you aren’t sure how many arguments are going to be passed to a function, or if you want to pass a stored list or tuple of arguments to a function.
- Arbitrary number of arguments.
- These arguments will be wrapped up in a tuple.