Fineuralab original fictional teaching example / 原创虚构教学样例
Download data-summary.py and sample.csv into one folder.
将 data-summary.py 与 sample.csv 下载到同一目录，在该目录运行：
python3 --version
python3 data-summary.py --test
python3 data-summary.py sample.csv
Expected / 期望: A mean3, B mean6, total count4, missing1, mean4.5.
Output is printed, not written over input. 浏览器不执行Python；需本机Python 3.10+。
No network, third-party dependencies or account. 不联网，无第三方依赖或账号。