from timeit import timeit
from random import randint


class Base(object):
    pass

class Derived1(Base):
    pass

class Derived2(Derived1):
    def __init__(self):
        super(Derived2, self).__init__()
        self.d = {i + 10: i * 35 for i in range(100)}

    def get_item_exists(self):
        return self.d.get(randint(10, 109), None)

    def get_item_not_exists(self):
        return self.d.get(randint(200, 299), None)

    def try_item_exists(self):
        return self.d[randint(10, 109)]

    def try_item_not_exists(self):
        return self.d[randint(200, 299)]

class Basey(object):
    pass


derived = Derived2()
def using_get(base_cls, meth):
    if isinstance(derived, base_cls):
        item = getattr(derived, meth)()
        if item is not None:
            return 1
        else:
            return 2
    else:
        return 2

def using_hasattr_with_try(meth):
    f = getattr(derived, meth, None)
    if f is None:
        return 2
    try:
        return f()
    except KeyError:
        return 2

def using_hasattr_with_get(meth):
    f = getattr(derived, meth, None)
    if f is None:
        return 2
    if f() is not None:
        return 1
    else:
        return 2

def using_try(meth):
    try:
        return getattr(derived, meth)()
    except (AttributeError, KeyError):
        return 2


number = 100000
print('Using get')
print(timeit(stmt='using_get(Base, "get_item_exists")', globals=globals(), number=number))
print(timeit(stmt='using_get(Base, "get_item_not_exists")', globals=globals(), number=number))
print(timeit(stmt='using_get(Basey, "get_item_exists")', globals=globals(), number=number))

print('Using try')
print(timeit(stmt='using_try("try_item_exists")', globals=globals(), number=number))
print(timeit(stmt='using_try("try_item_not_exists")', globals=globals(), number=number))
print(timeit(stmt='using_try("crapshoot")', globals=globals(), number=number))

print('Using hasattr with try')
print(timeit(stmt='using_hasattr_with_try("try_item_exists")', globals=globals(), number=number))
print(timeit(stmt='using_hasattr_with_try("try_item_not_exists")', globals=globals(), number=number))
print(timeit(stmt='using_hasattr_with_try("crapshoot")', globals=globals(), number=number))

print('Using hasattr with get')
print(timeit(stmt='using_hasattr_with_get("get_item_exists")', globals=globals(), number=number))
print(timeit(stmt='using_hasattr_with_get("get_item_not_exists")', globals=globals(), number=number))
print(timeit(stmt='using_hasattr_with_get("crapshoot")', globals=globals(), number=number))