flask_cors中遇到的问题在启动flask后一段时间，出现如下的报错仔细观察，发现此时并没有任何请求访问，程序也没

在启动flask后一段时间，出现如下的报错

Exception ignored in: <generator object probably_regex.<locals>.<genexpr> at 0x1134bf138>
Traceback (most recent call last):
   File "/usr/local/lib/python3.7/site-packages/flask_cors/core.py", line 256, in <genexpr>
    return any((c in maybe_regex for c in common_regex_chars))
SystemError: error return without exception set

仔细观察，发现此时并没有任何请求访问，程序也没任何异常，接口能正常访问

查阅资料，发现是和pycharm的设置有关，于是将pycharm->Run->Edit Configurations中添加Environment variable：

PYDEVD_USE_FRAME_EVAL=NO

重启之后，上述问题不再出现，但是为何flask_cors中会遇到这种现象？

给出的解释是

Raised when the interpreter finds an internal error, but the situation does not look so serious to cause it to abandon all hope. The associated value is a string indicating what went wrong (in low-level terms). -SystemError