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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def parse_vasprun( self ):
 """ Read in `vasprun.xml` as a pymatgen Vasprun object. Args: None Returns: None None: If the vasprun.xml is not well formed this method will catch the ParseError and set self.vasprun = None. """
            
        self.vasprun_filename = match_filename( 'vasprun.xml' )
        if not self.vasprun_filename:
            raise FileNotFoundError( 'Could not find vasprun.xml or vasprun.xml.gz file' )
        try:
            self.vasprun = Vasprun( self.vasprun_filename, parse_potcar_file=False )
        except ET.ParseError:
            self.vasprun = None
        except:
            raise