@ Scipy lecture notes, Edition 2017.1
https://www.scipy-lectures.org/_downloads/ScipyLectures-simple.pdf
https://scipy-lectures.org/_downloads/ScipyLectures-simple.pdf (2019-05-12現在)
p34
Warning: Module caching
...
In Python3 insteaad of reload is not builtin, so you have to import the importlib module first and then do:
In [10]: importlib.reload(demo)
cachingによる失敗は何度かしている。