https://stackoverflow.com/questions/45784499/what-is-the-difference-between-and-in-jupyter-notebooks
What is the difference between ! and % in Jupyter notebooks?
Both ! and % allow you to run shell commands from a Jupyter notebook. % is provided by the IPython kernel and allows you to run "magic commands", many of which include well-known shell
stackoverflow.com
! calls out to a shell (in a new process), while % affects the process associated with the notebook (or the notebook itself; many % commands have no shell counterpart).
!cd foo, by itself, has no lasting effect, since the process with the changed directory immediately terminates.
%cd foo changes the current directory of the notebook process, which is a lasting effect.
- !는 파이썬 인터프리터에 외치는 것처럼 한 번 외쳐지고 끝나는 것
- %는 명령어의 영향이 지속됨
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