安裝icrawler時候運行如下命令
sudo pip install icrawler
報錯：
Cannot uninstall 'requests'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall
這是就舊版本的requests 依賴比較多，pip不能準確找到依賴關係。
解決方式：忽略舊版本的依賴信息
運行如下命令：
sudo pip install icrawler --ignore-installed requests