def level_data(self, *args):
assert args[<NUM_LIT:0>].lower() in '<STR_LIT>', '<STR_LIT>'%level<EOL>self['<STR_LIT>'] = '<STR_LIT>'%args<EOL>return self<EOL>
Just used in QRCode for the moment
args are error_correction,margin_size
APIPARAM: chld