pip3 install时，报一堆requirement already satisfied怎么解决

pip3 install xxx时，报一堆requirement already satisfied怎么解决

当我想 pip3 install itchat时，遇到：

Requirement already satisfied: itchat in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (1.3.10)
Requirement already satisfied: requests in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from itchat) (2.23.0)
Requirement already satisfied: pypng in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from itchat) (0.0.20)
Requirement already satisfied: pyqrcode in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from itchat) (1.2.1)
Requirement already satisfied: chardet<4,>=3.0.2 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests->itchat) (3.0.4)
Requirement already satisfied: idna<3,>=2.5 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests->itchat) (2.9)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests->itchat) (1.25.9)
Requirement already satisfied: certifi>=2017.4.17 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests->itchat) (2020.4.5.1)

解决方法：

把路径放进去：

pip3 install --target=/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages itchat

就可以了！