def dale_chall(self, diff_count, words, sentences):
pdw = diff_count / words * <NUM_LIT:100><EOL>asl = words / sentences<EOL>raw = <NUM_LIT> * (pdw) + <NUM_LIT> * asl<EOL>if pdw > <NUM_LIT:5>:<EOL><INDENT>return raw + <NUM_LIT><EOL><DEDENT>return raw<EOL>
Calculate Dale-Chall readability score.