我正在尝试在 PyRFC 的帮助下将 SAP 与 python 连接起来。我指的是本指南https://blogs.sap.com/2020/06/09/connecting-python-with-sap-step-by-step-guide/进行连接。但是，我无法在我的系统中安装 PyRFC。我已经维护了文章中定义的系统变量，在尝试安装 PyRFC.tar.gz 文件后，它显示
ERROR: Command errored out with exit status 1:
command: 'c:\users\20035128\appdata\local\programs\python\python37\python.exe' -c
'import sys, setuptools, tokenize; sys.argv[0] =
'"'"'C:\\Users\\20035128\\AppData\\Local\\Temp\\pip-req-build-4ouyveyv\\setup.py'"'"';
__file__='"'"'C:\\Users\\20035128\\AppData\\Local\\Temp\\pip-req-build-4ouy
veyv\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open (__file__);
code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();
exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base
'C:\Users\20035128\AppData\Local\Temp\pip-pip-egg-info-fwk_dg_0'
cwd: C:\Users\20035128\AppData\Local\Temp\pip-req-build-4ouyveyv\
Complete output (1 lines):
Environment variable SAPNWRFC_HOME not set. Please specify this variable with the root
directory of the SAP NW RFC Library.
----------------------------------------
WARNING: Discarding file:///C:/Users/20035128/Downloads/PyRFC-2.0.4.tar.gz. Command errored
out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for
full command output.
请帮我解决一下这个。