def test_exception_compute():
comp = Computation()
comp.add_node('a', value=1)
comp.add_node('b', lambda a: a / 0)
comp.add_node('c', lambda b: b)
comp.compute('c')
assert comp['a'] == (States.UPTODATE, 1)
assert comp.state('b') == States.ERROR
assert comp.state('c') == States.STALE
def test_compute_with_unpicklable_object():
class Unpicklable(object):
def __getstate__(self):
raise Exception("UNPICKLABLE")
comp = Computation()
comp.add_node('a', value=Unpicklable())
comp.add_node('b', lambda a: None)
comp.compute('b')
def test_error_stops_compute():
comp = Computation()
comp.add_node('a')
comp.add_node('b', lambda a: a / 0)
comp.add_node('c', lambda b: b + 1)
comp.insert('a', 1)
comp.compute('c')
assert comp['a'] == (States.UPTODATE, 1)
assert comp.state('b') == States.ERROR
assert comp.state('c') == States.STALE
def test_compute_multiple():
comp = Computation()
comp.add_node('a', value=1)
comp.add_node('b', lambda a: a + 1)
comp.add_node('c', lambda a: 2 * a)
comp.add_node('d', lambda b, c: b + c)
comp.compute(['b', 'c'])
assert comp.s.b == States.UPTODATE
assert comp.s.c == States.UPTODATE
assert comp.s.d != States.UPTODATE
def test_default_args():
comp = Computation()
comp.add_node('x', value=1)
def bar(x, some_default=0):
return x + some_default
comp.add_node('foo', bar)
assert set(comp.i.foo) == {'x'}
comp.compute('foo')
assert comp.v.foo == 1
def test_with_uptodate_predecessors_but_stale_ancestors():
comp = Computation()
comp.add_node('a', value=1)
comp.add_node('b', lambda a: a + 1)
comp.compute_all()
assert comp['b'] == (States.UPTODATE, 2)
comp.dag.nodes['a'][
'state'] = States.UNINITIALIZED # This can happen due to serialization
comp.add_node('c', lambda b: b + 1)
comp.compute('c')
assert comp['b'] == (States.UPTODATE, 2)
assert comp['c'] == (States.UPTODATE, 3)
def test_state_map_with_adding_existing_node():
comp = Computation()
comp.add_node('a', lambda: 1)
assert comp._state_map[States.COMPUTABLE] == {'a'}
assert comp._state_map[States.UPTODATE] == set()
comp.compute('a')
assert comp._state_map[States.COMPUTABLE] == set()
assert comp._state_map[States.UPTODATE] == {'a'}
comp.add_node('a', lambda: 1)
assert comp._state_map[States.COMPUTABLE] == {'a'}
assert comp._state_map[States.UPTODATE] == set()
comp.compute('a')
assert comp._state_map[States.COMPUTABLE] == set()
assert comp._state_map[States.UPTODATE] == {'a'}
def test_basic():
def b(a):
return a + 1
def c(a):
return 2 * a
def d(b, c):
return b + c
comp = Computation()
comp.add_node("a")
comp.add_node("b", b)
comp.add_node("c", c)
comp.add_node("d", d)
assert comp.state('a') == States.UNINITIALIZED
assert comp.state('c') == States.UNINITIALIZED
assert comp.state('b') == States.UNINITIALIZED
assert comp.state('d') == States.UNINITIALIZED
assert comp._state_map[States.UNINITIALIZED] == set(['a', 'b', 'c', 'd'])
comp.insert("a", 1)
assert comp.state('a') == States.UPTODATE
assert comp.state('b') == States.COMPUTABLE
assert comp.state('c') == States.COMPUTABLE
assert comp.state('d') == States.STALE
assert comp.value('a') == 1
comp.compute_all()
assert comp.state('a') == States.UPTODATE
assert comp.state('b') == States.UPTODATE
assert comp.state('c') == States.UPTODATE
assert comp.state('d') == States.UPTODATE
assert comp.value('a') == 1
assert comp.value('b') == 2
assert comp.value('c') == 2
assert comp.value('d') == 4
comp.insert("a", 2)
comp.compute("b")
assert comp.state('a') == States.UPTODATE
assert comp.state('b') == States.UPTODATE
assert comp.state('c') == States.COMPUTABLE
assert comp.state('d') == States.STALE
assert comp.value('a') == 2
assert comp.value('b') == 3
assert set(comp._get_calc_nodes("d")) == set(['c', 'd'])
def test_compute_fib_5():
n = 5
comp = Computation()
def add(x, y):
return x + y
comp.add_node(0, value=1)
comp.add_node(1, value=1)
for i in range(2, n + 1):
comp.add_node(i, add, kwds={'x': i - 2, 'y': i - 1}, inspect=False)
comp.compute(n)
assert comp.state(n) == States.UPTODATE
def test_raising_exception_compute_all():
comp = Computation()
comp.add_node('a', value=1)
comp.add_node('b', lambda a: a / 0)
comp.add_node('c', lambda b: b)
comp.compute('c', raise_exceptions=True)