KeyError: ‘/home/xxx/anaconda3/lib/python3.8/site-packages/parso/python/grammar38.txt‘

Import the model in IPython and use tab to complete it. If this error occurs, it will be reported as follows:

NotImplementedError: Python version None is currently not supported.

The reason may be that the Parso package is too old and lacks the grammar38.txt file. Just go to the next higher version.