环境：
python3.6.2 + win10
指令如下：
pip install chatterbot
然后报错。
Cannot uninstall 'PyYAML'. 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.
尝试装一个低版本的，然后解决。
解决方案
pip install chatterbot==1.0.1
可以解决，原因可能是版本不匹配导致？