区别于python中的命令行和CGI

Question

是否可以区分我的Python脚本是从Web服务器（作为CGI脚本）还是从命令行执行？

我看过只有PHP和Perl的回复：
What is the canonical way to determine commandline vs. http execution of a PHP script?
How can I determine if a script was called from the command line or as a cgi script?

Answer 1

Perl answer也适用于Python;检查GATEWAY_INTERFACE environment variable：

import os
if 'GATEWAY_INTERFACE' in os.environ:
    print ('CGI')
else:
    print ('Not CGI. CLI?')