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, ...).
 
Release 2.5.4, documentation updated on 23rd December, 2008.
 
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