def xinterval(iterable):
'''
Discover the length of the smallest interval that can contain the value of
every items in `iterable`.
:argument iterable: iterable object
:return: a number
>>> from blade.xmath import xinterval
>>> xinterval([3, 5, 7, 3, 11])
8
'''
i1, i2 = tee(sorted(iterable))
return deque(i1, maxlen=1).pop() - next(i2)
def xat(iterable, n, default=None):
'''
:term:`Slice` off items in `iterable` found at index `n`.
:argument iterable: :term:`iterable`
:argument int n: index of some items in `iterable`
:keyword default: default returned if nothing is found at `n`
:return: :term:`iterator` of items
>>> from blade.xslice import xat
>>> # default behavior
>>> xat([5, 4, 3, 2, 1], 2)
3
>>> # return default value if nothing found at index
>>> xat([5, 4, 3, 2, 1], 10, 11)
11
'''
return next(islice(iterable, n, None), default)
def test_deferiter(self):
from stuf.six import next
from stuf.iterable import deferiter
deferred = deferiter(iter([1, 2, 3]))
self.assertEqual(next(deferred), 1)
def test_deferfunc(self):
from stuf.six import next
from stuf.iterable import deferfunc
deferred = deferfunc(lambda: 1)
self.assertEqual(next(deferred), 1)
