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from functools import partial
import pytest
empty = object()
class cached_property:
def __init__(self, func):
self.func = func
def __get__(self, obj, cls):
value = obj.__dict__[self.func.__name__] = self.func(obj)
return value
class SimpleProxy:
def __init__(self, factory):
self.factory = factory
self.object = empty
def __str__(self):
if self.object is empty:
self.object = self.factory()
return str(self.object)
class CachedPropertyProxy:
def __init__(self, factory):
self.factory = factory
@cached_property
def object(self):
return self.factory()
def __str__(self):
return str(self.object)
class LocalsSimpleProxy:
def __init__(self, factory):
self.factory = factory
self.object = empty
def __str__(self, func=str):
if self.object is empty:
self.object = self.factory()
return func(self.object)
class LocalsCachedPropertyProxy:
def __init__(self, factory):
self.factory = factory
@cached_property
def object(self):
return self.factory()
def __str__(self, func=str):
return func(self.object)
@pytest.fixture(scope='module', params=['SimpleProxy', 'CachedPropertyProxy', 'LocalsSimpleProxy', 'LocalsCachedPropertyProxy'])
def impl(request):
return globals()[request.param]
def test_proto(benchmark, impl):
obj = 'foobar'
proxied = impl(lambda: obj)
result = benchmark(partial(str, proxied))
assert result == obj
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