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- cdef class reify:
- """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 data descriptor.
- """
- cdef object wrapped
- cdef object name
- def __init__(self, wrapped):
- self.wrapped = wrapped
- self.name = wrapped.__name__
- @property
- def __doc__(self):
- return self.wrapped.__doc__
- def __get__(self, inst, owner):
- try:
- try:
- return inst._cache[self.name]
- except KeyError:
- val = self.wrapped(inst)
- inst._cache[self.name] = val
- return val
- except AttributeError:
- if inst is None:
- return self
- raise
- def __set__(self, inst, value):
- raise AttributeError("reified property is read-only")
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