Python 3.X ctypes 和 greenlet size changed 坑三则

Est at 
安装 setup.py 的时候 No module named '_ctypes' 报错 Traceback (most recent call last): File "", line 1, in File "/usr/local/python3/lib/python3.9/site-packages/setuptools/__init__.py", line 18, in from setuptools.dist import Distribution File "/usr/local/python3/lib/python3 ………