Source code for pyramid.decorator

from functools import update_wrapper


[docs]class reify(object): """ Use as a class method decorator. It operates almost exactly like the Python ``@property`` decorator, but it puts the result of the method it decorates into the instance dict after the first call, effectively replacing the function it decorates with an instance variable. It is, in Python parlance, a non-data descriptor. An example: .. testsetup:: from pyramid.decorator import reify class Foo(object): @reify def jammy(self): print('jammy called') return 1 And usage of Foo: .. doctest:: >>> f = Foo() >>> v = f.jammy jammy called >>> print(v) 1 >>> f.jammy 1 >>> # jammy func not called the second time; it replaced itself with 1 >>> # Note: reassignment is possible >>> f.jammy = 2 >>> f.jammy 2 """ def __init__(self, wrapped): self.wrapped = wrapped update_wrapper(self, wrapped) def __get__(self, inst, objtype=None): if inst is None: return self val = self.wrapped(inst) setattr(inst, self.wrapped.__name__, val) return val