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import pytest
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(): from pybind11_tests.sequences_and_iterators import IntPairs
assert list(IntPairs([(1, 2), (3, 4), (0, 5)]).nonzero()) == [(1, 2), (3, 4)] assert list(IntPairs([(1, 2), (2, 0), (0, 3), (4, 5)]).nonzero()) == [(1, 2)] assert list(IntPairs([(0, 3), (1, 2), (3, 4)]).nonzero()) == []
assert list(IntPairs([(1, 2), (3, 4), (0, 5)]).nonzero_keys()) == [1, 3] assert list(IntPairs([(1, 2), (2, 0), (0, 3), (4, 5)]).nonzero_keys()) == [1] assert list(IntPairs([(0, 3), (1, 2), (3, 4)]).nonzero_keys()) == []
# __next__ must continue to raise StopIteration it = IntPairs([(0, 0)]).nonzero() for _ in range(3): with pytest.raises(StopIteration): next(it)
it = IntPairs([(0, 0)]).nonzero_keys() for _ in range(3): with pytest.raises(StopIteration): next(it)
def test_sequence(): from pybind11_tests import ConstructorStats from pybind11_tests.sequences_and_iterators import Sequence
cstats = ConstructorStats.get(Sequence)
s = 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(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] = 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(): from pybind11_tests.sequences_and_iterators import StringMap
m = StringMap({'hi': 'bye', 'black': 'white'}) assert m['hi'] == 'bye' assert len(m) == 2 assert m['black'] == 'white'
with pytest.raises(KeyError): assert m['orange'] m['orange'] = 'banana' assert m['orange'] == 'banana'
expected = {'hi': 'bye', 'black': 'white', 'orange': 'banana'} for k in m: assert m[k] == expected[k] for k, v in m.items(): assert v == expected[k]
it = iter(StringMap({})) for _ in range(3): # __next__ must continue to raise StopIteration with pytest.raises(StopIteration): next(it)
def test_python_iterator_in_cpp(): import pybind11_tests.sequences_and_iterators as m
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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