from testutils import assertRaises
class Fubar:
def __init__(self):
self.x = 100
@property
def foo(self):
value = self.x
self.x += 1
return value
f = Fubar()
assert f.foo == 100
assert f.foo == 101
assert type(Fubar.foo) is property
class Bar:
def __init__(self):
self.a = 0
@property
def foo(self):
return self.a
@foo.setter
def foo(self, value):
self.a += value
@foo.deleter
def foo(self):
self.a -= 1
bar = Bar()
assert bar.foo == 0
bar.foo = 5
assert bar.a == 5
del bar.foo
assert bar.a == 4
del bar.foo
assert bar.a == 3
null_property = property()
assert type(null_property) is property
p = property(lambda x: x[0])
assert p.__get__((2,), tuple) == 2
assert p.__get__((2,)) == 2
with assertRaises(AttributeError):
null_property.__get__((), tuple)
with assertRaises(TypeError):
property.__new__(object)
p1 = property("a", "b", "c")
assert p1.fget == "a"
assert p1.fset == "b"
assert p1.fdel == "c"
assert p1.getter(1).fget == 1
assert p1.setter(2).fset == 2
assert p1.deleter(3).fdel == 3
assert p1.getter(None).fget == "a"
assert p1.setter(None).fset == "b"
assert p1.deleter(None).fdel == "c"
assert p1.__get__(None, object) is p1
p2 = property('a', doc='pdoc')