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An Introduction to Python
by Guido van Rossum and Fred L. Drake, Jr.
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ISBN 0954161769
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4.7.3 Arbitrary Argument Lists

Finally, the least frequently used option is to specify that a function can be called with an arbitrary number of arguments. These arguments will be wrapped up in a tuple. Before the variable number of arguments, zero or more normal arguments may occur.

    def fprintf(file, format, *args):
        file.write(format % args)
ISBN 0954161769An Introduction to PythonSee the print edition