Package twisted :: Package flow :: Module stage :: Class Map
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Class Map

Instruction --+    
              |    
          Stage --+
                  |
                 Map

Known Subclasses:
Zip

flow equivalent to map:  Map(function, stage, ... )

Apply a function to every item yielded and yield the results.
If additional stages are passed, the function must take that
many arguments and is applied to the items of all lists in 
parallel.  If a list is shorter than another, it is assumed
to be extended with None items.    If the function is None,
the identity function is assumed; if there are multiple list
arguments, Map stage returns a sequence consisting of tuples
containing the corresponding items from all lists.

    def fn(val):
        return val + 10
    
    source = flow.Map(fn,range(4))
    printFlow(source)

Method Summary
  __init__(self, func, stage, *stages)
  __iter__(self)
(inherited from Stage)
  next(self)
return current result (inherited from Stage)

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