save parameters to a file

def save(self, filename, wildcard='*', verbose=False):
        '''save parameters to a file'''
        f = open(filename, mode='w')
        k = list(self.keys())
        k.sort()
        count = 0
        for p in k:
            if p and fnmatch.fnmatch(str(p).upper(), wildcard.upper()):
                f.write("%-16.16s %f\n" % (p, self.__getitem__(p)))
                count += 1
        f.close()
        if verbose:
            print("Saved %u parameters to %s" % (count, filename))