test_attr_checking.py

import pytest


class A(object):
    def __init__(self, **kw):
        for k, v in kw.items():
            setattr(self, k, v)


class B(object):
    a = 1


class C(object):
    pass


with_obj = pytest.mark.parametrize("obj", [object(), C, A(a=1), B],
                                   ids=['without-obj', 'without-cls', 'withattr-obj', 'withattr-cls'])


@with_obj
def test_hasattr(benchmark, obj):
    @benchmark
    def func():
        return hasattr(obj, 'a')


@with_obj
def test_getattr(benchmark, obj):
    @benchmark
    def func(sentinel=object()):
        return getattr(obj, 'a', sentinel) is not sentinel


@with_obj
def test_tryexcept(benchmark, obj):
    @benchmark
    def func():
        try:
            obj.a
        except:
            return False
        else:
            return True