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import pytest
from pybind11_tests import sequences_and_iterators as m
from pybind11_tests import ConstructorStats
def isclose(a, b, rel_tol=1e-05, abs_tol=0.0):
"""Like math.isclose() from Python 3.5"""
return abs(a - b) <= max(rel_tol * max(abs(a), abs(b)), abs_tol)
def allclose(a_list, b_list, rel_tol=1e-05, abs_tol=0.0):
return all(isclose(a, b, rel_tol=rel_tol, abs_tol=abs_tol) for a, b in zip(a_list, b_list))
def test_generalized_iterators():
assert list(m.IntPairs([(1, 2), (3, 4), (0, 5)]).nonzero()) == [(1, 2), (3, 4)]
assert list(m.IntPairs([(1, 2), (2, 0), (0, 3), (4, 5)]).nonzero()) == [(1, 2)]
assert list(m.IntPairs([(0, 3), (1, 2), (3, 4)]).nonzero()) == []
assert list(m.IntPairs([(1, 2), (3, 4), (0, 5)]).nonzero_keys()) == [1, 3]
assert list(m.IntPairs([(1, 2), (2, 0), (0, 3), (4, 5)]).nonzero_keys()) == [1]
assert list(m.IntPairs([(0, 3), (1, 2), (3, 4)]).nonzero_keys()) == []
# __next__ must continue to raise StopIteration
it = m.IntPairs([(0, 0)]).nonzero()
for _ in range(3):
with pytest.raises(StopIteration):
next(it)
it = m.IntPairs([(0, 0)]).nonzero_keys()
for _ in range(3):
with pytest.raises(StopIteration):
next(it)
def test_sequence():
cstats = ConstructorStats.get(m.Sequence)
s = m.Sequence(5)
assert cstats.values() == ['of size', '5']
assert "Sequence" in repr(s)
assert len(s) == 5
assert s[0] == 0 and s[3] == 0
assert 12.34 not in s
s[0], s[3] = 12.34, 56.78
assert 12.34 in s
assert isclose(s[0], 12.34) and isclose(s[3], 56.78)
rev = reversed(s)
assert cstats.values() == ['of size', '5']
rev2 = s[::-1]
assert cstats.values() == ['of size', '5']
it = iter(m.Sequence(0))
for _ in range(3): # __next__ must continue to raise StopIteration
with pytest.raises(StopIteration):
next(it)
assert cstats.values() == ['of size', '0']
expected = [0, 56.78, 0, 0, 12.34]
assert allclose(rev, expected)
assert allclose(rev2, expected)
assert rev == rev2
rev[0::2] = m.Sequence([2.0, 2.0, 2.0])
assert cstats.values() == ['of size', '3', 'from std::vector']
assert allclose(rev, [2, 56.78, 2, 0, 2])
assert cstats.alive() == 4
del it
assert cstats.alive() == 3
del s
assert cstats.alive() == 2
del rev
assert cstats.alive() == 1
del rev2
assert cstats.alive() == 0
assert cstats.values() == []
assert cstats.default_constructions == 0
assert cstats.copy_constructions == 0
assert cstats.move_constructions >= 1
assert cstats.copy_assignments == 0
assert cstats.move_assignments == 0
def test_map_iterator():
sm = m.StringMap({'hi': 'bye', 'black': 'white'})
assert sm['hi'] == 'bye'
assert len(sm) == 2
assert sm['black'] == 'white'
with pytest.raises(KeyError):
assert sm['orange']
sm['orange'] = 'banana'
assert sm['orange'] == 'banana'
expected = {'hi': 'bye', 'black': 'white', 'orange': 'banana'}
for k in sm:
assert sm[k] == expected[k]
for k, v in sm.items():
assert v == expected[k]
it = iter(m.StringMap({}))
for _ in range(3): # __next__ must continue to raise StopIteration
with pytest.raises(StopIteration):
next(it)
def test_python_iterator_in_cpp():
t = (1, 2, 3)
assert m.object_to_list(t) == [1, 2, 3]
assert m.object_to_list(iter(t)) == [1, 2, 3]
assert m.iterator_to_list(iter(t)) == [1, 2, 3]
with pytest.raises(TypeError) as excinfo:
m.object_to_list(1)
assert "object is not iterable" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.iterator_to_list(1)
assert "incompatible function arguments" in str(excinfo.value)
def bad_next_call():
raise RuntimeError("py::iterator::advance() should propagate errors")
with pytest.raises(RuntimeError) as excinfo:
m.iterator_to_list(iter(bad_next_call, None))
assert str(excinfo.value) == "py::iterator::advance() should propagate errors"
l = [1, None, 0, None]
assert m.count_none(l) == 2
assert m.find_none(l) is True
assert m.count_nonzeros({"a": 0, "b": 1, "c": 2}) == 2
r = range(5)
assert all(m.tuple_iterator(tuple(r)))
assert all(m.list_iterator(list(r)))
assert all(m.sequence_iterator(r))
def test_iterator_passthrough():
"""#181: iterator passthrough did not compile"""
from pybind11_tests.sequences_and_iterators import iterator_passthrough
assert list(iterator_passthrough(iter([3, 5, 7, 9, 11, 13, 15]))) == [3, 5, 7, 9, 11, 13, 15]
def test_iterator_rvp():
"""#388: Can't make iterators via make_iterator() with different r/v policies """
import pybind11_tests.sequences_and_iterators as m
assert list(m.make_iterator_1()) == [1, 2, 3]
assert list(m.make_iterator_2()) == [1, 2, 3]
assert not isinstance(m.make_iterator_1(), type(m.make_iterator_2()))
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