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# -*- coding: utf-8 -*-
import itertools
from typing import Iterable, Iterator, Tuple, Set
def ranges_to_set(lst: Iterable[Tuple[int, int]]) -> Set[int]:
"""
Convert a list of ranges to a set of numbers::
>>> ranges = [(1,3), (5,6)]
>>> sorted(list(ranges_to_set(ranges)))
[1, 2, 3, 5, 6]
"""
return set(itertools.chain(*(range(x[0], x[1] + 1) for x in lst)))
def to_ranges(lst: Iterable[int]) -> Iterator[Tuple[int, int]]:
"""
Convert a list of numbers to a list of ranges::
>>> numbers = [1,2,3,5,6]
>>> list(to_ranges(numbers))
[(1, 3), (5, 6)]
"""
for a, b in itertools.groupby(enumerate(lst), lambda t: t[1] - t[0]):
c = list(b)
yield c[0][1], c[-1][1]
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