mirror of
https://github.com/pybind/pybind11.git
synced 2024-12-01 09:27:12 +00:00
b4498ef44d
Allows checking the Python types before creating an object instead of
after. For example:
```c++
auto l = list(ptr, true);
if (l.check())
// ...
```
The above is replaced with:
```c++
if (isinstance<list>(ptr)) {
auto l = reinterpret_borrow(ptr);
// ...
}
```
This deprecates `py::object::check()`. `py::isinstance()` covers the
same use case, but it can also check for user-defined types:
```c++
class Pet { ... };
py::class_<Pet>(...);
m.def("is_pet", [](py::object obj) {
return py::isinstance<Pet>(obj); // works as expected
});
```
56 lines
2.1 KiB
Python
56 lines
2.1 KiB
Python
import pytest
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def test_inheritance(msg):
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from pybind11_tests import Pet, Dog, Rabbit, Hamster, dog_bark, pet_name_species
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roger = Rabbit('Rabbit')
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assert roger.name() + " is a " + roger.species() == "Rabbit is a parrot"
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assert pet_name_species(roger) == "Rabbit is a parrot"
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polly = Pet('Polly', 'parrot')
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assert polly.name() + " is a " + polly.species() == "Polly is a parrot"
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assert pet_name_species(polly) == "Polly is a parrot"
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molly = Dog('Molly')
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assert molly.name() + " is a " + molly.species() == "Molly is a dog"
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assert pet_name_species(molly) == "Molly is a dog"
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fred = Hamster('Fred')
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assert fred.name() + " is a " + fred.species() == "Fred is a rodent"
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assert dog_bark(molly) == "Woof!"
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with pytest.raises(TypeError) as excinfo:
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dog_bark(polly)
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assert msg(excinfo.value) == """
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dog_bark(): incompatible function arguments. The following argument types are supported:
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1. (arg0: m.Dog) -> str
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Invoked with: <m.Pet object at 0>
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"""
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def test_automatic_upcasting():
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from pybind11_tests import return_class_1, return_class_2, return_class_n, return_none
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assert type(return_class_1()).__name__ == "DerivedClass1"
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assert type(return_class_2()).__name__ == "DerivedClass2"
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assert type(return_none()).__name__ == "NoneType"
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# Repeat these a few times in a random order to ensure no invalid caching is applied
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assert type(return_class_n(1)).__name__ == "DerivedClass1"
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assert type(return_class_n(2)).__name__ == "DerivedClass2"
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assert type(return_class_n(0)).__name__ == "BaseClass"
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assert type(return_class_n(2)).__name__ == "DerivedClass2"
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assert type(return_class_n(2)).__name__ == "DerivedClass2"
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assert type(return_class_n(0)).__name__ == "BaseClass"
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assert type(return_class_n(1)).__name__ == "DerivedClass1"
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def test_isinstance():
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from pybind11_tests import test_isinstance, Pet, Dog
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objects = [tuple(), dict(), Pet("Polly", "parrot")] + [Dog("Molly")] * 4
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expected = (True, True, True, True, True, False, False)
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assert test_isinstance(objects) == expected
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