Article.py: remove debug statement.

app/Article.py

@@ -59,7 +59,6 @@ def get_today_article(user_word_list, existing_articles):
             text_level = text_difficulty_level(reading['text'], d3)
             factor = random.gauss(0.8,
                                   0.1)  # a number drawn from Gaussian distribution with a mean of 0.8 and a stand deviation of 1
-            print("factor:{}, text_level:{}, user_level:{}, range:{}".format(factor, text_level, user_level, (8.0 - user_level) * factor))
             if reading['article_id'] not in existing_articles[1] and within_range(text_level, user_level, (8.0 - user_level) * factor):  # 新的文章之前没有出现过且符合一定范围的水平
                 d = reading
                 existing_articles[1].append(d['article_id'])  # 列表添加新的文章id；下面进行
@@ -125,4 +124,4 @@ def get_answer_part(s):
             flag = 1
         elif flag == 1:
             result.append(line)
-    return '\n'.join(result)
+    return '\n'.join(result)