Q:

FME values used in python

I need one attribute value from FME and use it in python script as a parameter. How can I do this? Do I have to have def_init_() def input(), def close() also?

A:

To view the API documentation, navigate to your FME installation folder and go to this location: help\python\apidoc\index.html
In this case you'll want to use the GetAttribute method:

getAttribute(attrName) 
Get the value of the named attribute.  A return of None indicates the
  attribute does not exist.
Parameters:
          attrName (string) - The name of the attribute to get.
Returns: bool, int, long, float, string, list of string, or None
      The value of the named attribute.

