def __call__(self, x, pos=None):
if len(self.locs)==<NUM_LIT:0>:<EOL><INDENT>return '<STR_LIT>'<EOL><DEDENT>else:<EOL><INDENT>s = self.pprint_val(x)<EOL>return self.fix_minus(s)<EOL><DEDENT>
Return the format for tick val *x* at position *pos*