我正在尝试导入numpy。我使用pip进行安装。pip install numpy它返回：Requirement already satisfied: numpy in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (1.8.0rc1)当我使用from numpy import *在python中对其进行测试时，它返回了ModuleNotFoundError: No module named 'numpy'发生了什么事？???