https://docs.python.jp/3/library/collections.html#namedtuple-factory-function-for-tuples-with-named-fields
https://docs.python.jp/3/library/collections.html#namedtuple-factory-function-for-tuples-with-named-fields

pylangstudy/docs.python.jp.Progress.v0,pylangstudy/docs.python.jp.Progress.v0