Jupyter notebook 什么是Jupyter'；她在干什么？

Python shell

>>> import threading; threading.enumerate()

[<_MainThread(MainThread, started 4559670720)>]

>导入线程；threading.enumerate（）
[]

iPython

>>> import threading; threading.enumerate()

[<_MainThread(MainThread, started 4442410432)>,
 <HistorySavingThread(IPythonHistorySavingThread, started 123145491013632)>]

>导入线程；threading.enumerate（）
[,
]

JupyterLab

>>> import threading; threading.enumerate()

[<_MainThread(MainThread, started 4581752256)>,
 <Thread(Thread-2, started daemon 123145360560128)>,
 <Heartbeat(Thread-3, started daemon 123145365815296)>,
 <HistorySavingThread(IPythonHistorySavingThread, started 123145372143616)>,
 <ParentPollerUnix(Thread-1, started daemon 123145377935360)>]

>导入线程；threading.enumerate（）
[,
,
,
,
]

起初我以为我已经启动了

Thread-2

，但每次内核重新启动时它都会出现