parameters: (self, fn)
docstring: Sets a function for rewriting filenames before gathering.
docstring_summary: Sets a function for rewriting filenames before gathering.
docstring_tokens: Sets a function for rewriting filenames before gathering .
function: def SetFilenameExpansionFunction(self, fn):
      '''Sets a function for rewriting filenames before gathering.'''
      pass
function_tokens: def SetFilenameExpansionFunction ( self , fn ) : pass