code: def write(self, font, feaFile, compiler=None):
          
          self.setContext(font, feaFile, compiler=compiler)
          try:
              if self.shouldContinue():
                  return self._write()
              else:
                  return False
          finally:
              del self.context
docs: Write features and class definitions for this font to a feaLib
          FeatureFile object.
          Returns True if feature file was modified, False if no new features
          were generated.