安装运行jupyter notebook时报错：ModuleNotFoundError: No module named 'prompt_toolkit.formatted_text'

pip3 install --upgrade prompt-toolkit==2.0.4

abc:数据分析 mac126$ pip3 install --upgrade prompt-toolkit==2.0.4
Collecting prompt-toolkit==2.0.4
  Downloading https://files.pythonhosted.org/packages/91/ef/f4010d53dbd736c47e78d2226b12ab446bbe0ce66616d0b92d51d8a15fe4/prompt_toolkit-2.0.4-py3-none-any.whl (328kB)
    100% |████████████████████████████████| 337kB 120kB/s 
Requirement already satisfied, skipping upgrade: wcwidth in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from prompt-toolkit==2.0.4) (0.1.7)
Requirement already satisfied, skipping upgrade: six>=1.9.0 in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from prompt-toolkit==2.0.4) (1.11.0)
py2neo 4.1.3 has requirement prompt_toolkit==1.0.15, but you'll have prompt-toolkit 2.0.4 which is incompatible.
Installing collected packages: prompt-toolkit
  Found existing installation: prompt-toolkit 1.0.15
    Uninstalling prompt-toolkit-1.0.15:
      Successfully uninstalled prompt-toolkit-1.0.15

问题原因：

jupyter-console 5.2.0 has requirement prompt-toolkit<2.0.0,>=1.0.0, but you'll have

prompt-toolkit 2.0.4 which is incompatible.