回溯(最近一次调用最后一次):文件" C:\ Users \ admin \ Anaconda3 \ Scripts \ jupyter-notebook-script.py",第6行,来自notebook.notebookapp import main File& #34; C:\ Users \ admin \ Anaconda3 \ lib \ site-packages \ _ notebook__init __。py",第25行,来自.nbextensions import install_nbextension文件" C:\ Users \ admin \ Anaconda3 \ lib \ site-packages \ notebook \ nbextensions.py",第27行,来自jupyter_core.utils,import ensure_dir_exists ImportError:无法导入名称' ensure_dir_exists'