code: def pluginPackagePaths(name):
      
      package = name.split('.')
      # Note that this may include directories which do not exist.  It may be
      # preferable to remove such directories at this point, rather than allow
      # them to be searched later on.
      #
      # Note as well that only '__init__.py' will be considered to make a
      # directory a package (and thus exclude it from this list).  This means
      # that if you create a master plugin package which has some other kind of
      # __init__ (eg, __init__.pyc) it will be incorrectly treated as a
      # supplementary plugin directory.
      return [
          os.path.abspath(os.path.join(x, *package))
          for x
          in sys.path
          if
          not os.path.exists(os.path.join(x, *package + ['__init__.py']))]
docs: Return a list of additional directories which should be searched for
      modules to be included as part of the named plugin package.
  
      @type name: C{str}
      @param name: The fully-qualified Python name of a plugin package, eg
          C{'twisted.plugins'}.
  
      @rtype: C{list} of C{str}
      @return: The absolute paths to other directories which may contain plugin
          modules for the named plugin package.