제가 pip install pyjwt 를 비주얼 터미널에서 했는데요 pip install pyjwt Requirement already satisfied: pyjwt in c:\python38-64\lib\site-packages (2.0.1) WARNING: You are using pip version 20.2.3; however, version 21.0.1 is available. You should consider upgrading via the 'c:\python38-64\python.exe -m pip install --upgrade pip' command. 왜 이럴까요