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class RevealAccess(object):
"""
A data descriptor that sets and returns values
normally and prints a message logging their access.
"""
def __init__(self, initval=None, name='var'):
self.val = initval
self.name = name
def __get__(self, obj, objtype):
print('Retrieving', self.name)
return self.val
def __set__(self, obj, val):
print('Updating', self.name)
self.val = val
def just_a_method(self):
pass
class C(object):
x = RevealAccess(10, 'var "x"')
#? RevealAccess()
x
#? ['just_a_method']
x.just_a_method
y = 5.0
def __init__(self):
#? int()
self.x
#? []
self.just_a_method
#? []
C.just_a_method
m = C()
#? int()
m.x
#? float()
m.y
#? int()
C.x
#? []
m.just_a_method
#? []
C.just_a_method
# -----------------
# properties
# -----------------
class B():
@property
def r(self):
return 1
@r.setter
def r(self, value):
return ''
def t(self):
return ''
p = property(t)
#? []
B().r().
#? int()
B().r
#? str()
B().p
#? []
B().p().
class PropClass():
def __init__(self, a):
self.a = a
@property
def ret(self):
return self.a
@ret.setter
def ret(self, value):
return 1.0
def ret2(self):
return self.a
ret2 = property(ret2)
@property
def nested(self):
""" causes recusions in properties, should work """
return self.ret
@property
def nested2(self):
""" causes recusions in properties, should not work """
return self.nested2
@property
def join1(self):
""" mutual recusion """
return self.join2
@property
def join2(self):
""" mutual recusion """
return self.join1
#? str()
PropClass("").ret
#? []
PropClass().ret.
#? str()
PropClass("").ret2
#?
PropClass().ret2
#? int()
PropClass(1).nested
#? []
PropClass().nested.
#?
PropClass(1).nested2
#? []
PropClass().nested2.
#?
PropClass(1).join1
# -----------------
# staticmethod/classmethod
# -----------------
class E(object):
a = ''
def __init__(self, a):
self.a = a
def f(x):
return x
f = staticmethod(f)
@staticmethod
def g(x):
return x
def s(cls, x):
return x
s = classmethod(s)
@classmethod
def t(cls, x):
return x
@classmethod
def u(cls, x):
return cls.a
e = E(1)
#? int()
e.f(1)
#? int()
E.f(1)
#? int()
e.g(1)
#? int()
E.g(1)
#? int()
e.s(1)
#? int()
E.s(1)
#? int()
e.t(1)
#? int()
E.t(1)
#? str()
e.u(1)
#? str()
E.u(1)
# -----------------
# Conditions
# -----------------
from functools import partial
class Memoize():
def __init__(self, func):
self.func = func
def __get__(self, obj, objtype):
if obj is None:
return self.func
return partial(self, obj)
def __call__(self, *args, **kwargs):
# We don't do caching here, but that's what would normally happen.
return self.func(*args, **kwargs)
class MemoizeTest():
def __init__(self, x):
self.x = x
@Memoize
def some_func(self):
return self.x
#? int()
MemoizeTest(10).some_func()
# Now also call the same function over the class (see if clause above).
#? float()
MemoizeTest.some_func(MemoizeTest(10.0))
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