错误提示如下：
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pymssql/_mssql.cpython-38-darwin.so, 0x0002): symbol not found in flat namespace '_iconv'
已找到答案，链接如下：
https://blog.csdn.net/qq980469001/article/details/124739887?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_title~default-0-124739887-blog-117518126.pc_relevant_multi_platform_whitelistv4&spm=1001.2101.3001.4242.1&utm_relevant_index=3
补充：直接在pymssql的init中import _scproxy，就不用每次调用pymssql时候都要手动import _scproxy
安装其他版本的pip3 install "pymssql==2.1.5"