我在 Ubuntu 16.04 的终端中运行此代码。
sudo -H pip install dryscrape
但运行此代码后显示此错误：
Requirement already satisfied: dryscrape in /usr/local/lib/python2.7/dist-packages
Requirement already satisfied: xvfbwrapper in /usr/local/lib/python2.7/dist-packages (from dryscrape)
Requirement already satisfied: lxml in /usr/local/lib/python2.7/dist-packages (from dryscrape)
Requirement already satisfied: webkit-server>=1.0 in /usr/local/lib/python2.7/dist-packages (from dryscrape)
这个问题该怎么解决？