first commit

source/README_up_analysis.md

@@ -150,4 +150,10 @@ python source/extract_unfollow_list.py --format mid-only --split-size 100
 
 ```
 python sort_up_main.py
+```
+
+
+### 提取分组
+```
+python source/extract_group_info.py --input source/19_53_no_titles.md --output source/group_only.md
 ```