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import time
from threading import Thread
import pytest
import env # noqa: F401
from pybind11_tests import callbacks as m
from pybind11_tests import detailed_error_messages_enabled
def test_callbacks():
from functools import partial
def func1():
return "func1"
def func2(a, b, c, d):
return "func2", a, b, c, d
def func3(a):
return f"func3({a})"
assert m.test_callback1(func1) == "func1"
assert m.test_callback2(func2) == ("func2", "Hello", "x", True, 5)
assert m.test_callback1(partial(func2, 1, 2, 3, 4)) == ("func2", 1, 2, 3, 4)
assert m.test_callback1(partial(func3, "partial")) == "func3(partial)"
assert m.test_callback3(lambda i: i + 1) == "func(43) = 44"
f = m.test_callback4()
assert f(43) == 44
f = m.test_callback5()
assert f(number=43) == 44
def test_bound_method_callback():
# Bound Python method:
class MyClass:
def double(self, val):
return 2 * val
z = MyClass()
assert m.test_callback3(z.double) == "func(43) = 86"
z = m.CppBoundMethodTest()
assert m.test_callback3(z.triple) == "func(43) = 129"
def test_keyword_args_and_generalized_unpacking():
def f(*args, **kwargs):
return args, kwargs
assert m.test_tuple_unpacking(f) == (("positional", 1, 2, 3, 4, 5, 6), {})
assert m.test_dict_unpacking(f) == (
("positional", 1),
{"key": "value", "a": 1, "b": 2},
)
assert m.test_keyword_args(f) == ((), {"x": 10, "y": 20})
assert m.test_unpacking_and_keywords1(f) == ((1, 2), {"c": 3, "d": 4})
assert m.test_unpacking_and_keywords2(f) == (
("positional", 1, 2, 3, 4, 5),
{"key": "value", "a": 1, "b": 2, "c": 3, "d": 4, "e": 5},
)
with pytest.raises(TypeError) as excinfo:
m.test_unpacking_error1(f)
assert "Got multiple values for keyword argument" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.test_unpacking_error2(f)
assert "Got multiple values for keyword argument" in str(excinfo.value)
with pytest.raises(RuntimeError) as excinfo:
m.test_arg_conversion_error1(f)
assert str(excinfo.value) == "Unable to convert call argument " + (
"'1' of type 'UnregisteredType' to Python object"
if detailed_error_messages_enabled
else "'1' to Python object (#define PYBIND11_DETAILED_ERROR_MESSAGES or compile in debug mode for details)"
)
with pytest.raises(RuntimeError) as excinfo:
m.test_arg_conversion_error2(f)
assert str(excinfo.value) == "Unable to convert call argument " + (
"'expected_name' of type 'UnregisteredType' to Python object"
if detailed_error_messages_enabled
else "'expected_name' to Python object "
"(#define PYBIND11_DETAILED_ERROR_MESSAGES or compile in debug mode for details)"
)
def test_lambda_closure_cleanup():
m.test_lambda_closure_cleanup()
cstats = m.payload_cstats()
assert cstats.alive() == 0
assert cstats.copy_constructions == 1
assert cstats.move_constructions >= 1
def test_cpp_callable_cleanup():
alive_counts = m.test_cpp_callable_cleanup()
assert alive_counts == [0, 1, 2, 1, 2, 1, 0]
def test_cpp_function_roundtrip():
"""Test if passing a function pointer from C++ -> Python -> C++ yields the original pointer"""
assert (
m.test_dummy_function(m.dummy_function) == "matches dummy_function: eval(1) = 2"
)
assert (
m.test_dummy_function(m.roundtrip(m.dummy_function))
== "matches dummy_function: eval(1) = 2"
)
assert (
m.test_dummy_function(m.dummy_function_overloaded)
== "matches dummy_function: eval(1) = 2"
)
assert m.roundtrip(None, expect_none=True) is None
assert (
m.test_dummy_function(lambda x: x + 2)
== "can't convert to function pointer: eval(1) = 3"
)
with pytest.raises(TypeError) as excinfo:
m.test_dummy_function(m.dummy_function2)
assert "incompatible function arguments" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.test_dummy_function(lambda x, y: x + y)
assert any(
s in str(excinfo.value)
for s in ("missing 1 required positional argument", "takes exactly 2 arguments")
)
def test_function_signatures(doc):
assert doc(m.test_callback3) == "test_callback3(arg0: Callable[[int], int]) -> str"
assert doc(m.test_callback4) == "test_callback4() -> Callable[[int], int]"
def test_movable_object():
assert m.callback_with_movable(lambda _: None) is True
@pytest.mark.skipif(
"env.PYPY",
reason="PyPy segfaults on here. See discussion on #1413.",
)
def test_python_builtins():
"""Test if python builtins like sum() can be used as callbacks"""
assert m.test_sum_builtin(sum, [1, 2, 3]) == 6
assert m.test_sum_builtin(sum, []) == 0
def test_async_callbacks():
# serves as state for async callback
class Item:
def __init__(self, value):
self.value = value
res = []
# generate stateful lambda that will store result in `res`
def gen_f():
s = Item(3)
return lambda j: res.append(s.value + j)
# do some work async
work = [1, 2, 3, 4]
m.test_async_callback(gen_f(), work)
# wait until work is done
from time import sleep
sleep(0.5)
assert sum(res) == sum(x + 3 for x in work)
def test_async_async_callbacks():
t = Thread(target=test_async_callbacks)
t.start()
t.join()
def test_callback_num_times():
# Super-simple micro-benchmarking related to PR #2919.
# Example runtimes (Intel Xeon 2.2GHz, fully optimized):
# num_millions 1, repeats 2: 0.1 secs
# num_millions 20, repeats 10: 11.5 secs
one_million = 1000000
num_millions = 1 # Try 20 for actual micro-benchmarking.
repeats = 2 # Try 10.
rates = []
for rep in range(repeats):
t0 = time.time()
m.callback_num_times(lambda: None, num_millions * one_million)
td = time.time() - t0
rate = num_millions / td if td else 0
rates.append(rate)
if not rep:
print()
print(
f"callback_num_times: {num_millions:d} million / {td:.3f} seconds = {rate:.3f} million / second"
)
if len(rates) > 1:
print("Min Mean Max")
print(f"{min(rates):6.3f} {sum(rates) / len(rates):6.3f} {max(rates):6.3f}")
def test_custom_func():
assert m.custom_function(4) == 36
assert m.roundtrip(m.custom_function)(4) == 36
@pytest.mark.skipif(
m.custom_function2 is None, reason="Current PYBIND11_INTERNALS_VERSION too low"
)
def test_custom_func2():
assert m.custom_function2(3) == 27
assert m.roundtrip(m.custom_function2)(3) == 27
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