flutter安装完后，模拟器跑没任何问题，当真机测试时
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 52, in <module>
import weakref
File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/weakref.py", line 14, in <module>
from _weakref import (
ImportError: cannot import name _remove_dead_weakref
因为网上资料较少，很是痛苦，其实这个不影响真机运营，但是每每运行都报错，真的不能忍。解决方案：终端输入 brew uninstall --ignore-dependencies python@2 就OK了，直接忽略掉他的报错，感觉瞬间世界清静了。
