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Add utils.consume from cytoolz #539

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Add utils.consume from cytoolz #539

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2d6331e
Add efficient consume function
groutr Jul 21, 2022
fb89c61
Add test.
groutr Jul 21, 2022
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11 changes: 10 additions & 1 deletion toolz/tests/test_utils.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,15 @@
from toolz.utils import raises
from toolz.utils import raises, consume


def test_raises():
assert raises(ZeroDivisionError, lambda: 1 / 0)
assert not raises(ZeroDivisionError, lambda: 1)


def test_consume():
l = [1, 2, 3]
assert consume(l) is None
il = iter(l)
assert consume(il) is None
assert raises(StopIteration, lambda: next(il))
assert raises(TypeError, lambda: consume(1))
8 changes: 8 additions & 0 deletions toolz/utils.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,11 @@
from collections import deque


def consume(seq):
"""Efficently consume an iterable"""
deque(seq, maxlen=0)


def raises(err, lamda):
try:
lamda()
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