mypy complains if itertools.chain.from_iterable is given an iterator, tuple, or list. · Issue #521 · python/typeshed · GitHub
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Itertools in Python
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PYTHON : What is the difference between chain and chain.from_iterable in itertools? - YouTube
A look at itertools chain method - DEV Community
Looses type of nested/inner collection in a `flatten(filter(...))` chain · Issue #9176 · python/mypy · GitHub
chain an iterator of iterators · Issue #4 · JuliaCollections/IterTools.jl · GitHub
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Chain
Python] itertools를 활용한 리스트 원소를 n번 반복하여 새로운 리스트 만들기