尝试使用python脚本从github获取PR号。不断出现以下错误
File "flipp/.circleci/tests_from_modified_files.py", line 11, in <module>
PR_URL = os.environ["CIRCLE_PULL_REQUEST"]
File "/usr/lib/python3.7/os.py", line 678, in __getitem__
raise KeyError(key) from None
KeyError: 'CIRCLE_PULL_REQUEST'
Exited with code 1