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Python Language Reference Manual
by Guido van Rossum and Fred L. Drake, Jr.
Paperback (6"x9"), 120 pages
ISBN 0954161785
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3.4.4 Emulating callable objects

__call__(self[, args...])
Called when the instance is "called" as a function; if this method is defined, x(arg1, arg2, ...) is a shorthand for x.__call__(arg1, arg2, ...).
ISBN 0954161785Python Language Reference ManualSee the print edition