from cpython.dict cimport (
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PyDict_Contains,
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PyDict_GetItem,
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PyDict_SetItem,
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)
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from cython cimport Py_ssize_t
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cdef class CachedProperty:
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cdef readonly:
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object fget, name, __doc__
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def __init__(self, fget):
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self.fget = fget
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self.name = fget.__name__
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self.__doc__ = getattr(fget, "__doc__", None)
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def __get__(self, obj, typ):
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if obj is None:
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# accessed on the class, not the instance
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return self
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# Get the cache or set a default one if needed
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cache = getattr(obj, "_cache", None)
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if cache is None:
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try:
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cache = obj._cache = {}
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except (AttributeError):
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return self
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if PyDict_Contains(cache, self.name):
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# not necessary to Py_INCREF
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val = <object>PyDict_GetItem(cache, self.name)
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else:
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val = self.fget(obj)
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PyDict_SetItem(cache, self.name, val)
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return val
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def __set__(self, obj, value):
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raise AttributeError("Can't set attribute")
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cache_readonly = CachedProperty
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cdef class AxisProperty:
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cdef readonly:
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Py_ssize_t axis
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object __doc__
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def __init__(self, axis=0, doc=""):
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self.axis = axis
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self.__doc__ = doc
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def __get__(self, obj, type):
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cdef:
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list axes
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if obj is None:
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# Only instances have _mgr, not classes
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return self
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else:
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axes = obj._mgr.axes
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return axes[self.axis]
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def __set__(self, obj, value):
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obj._set_axis(self.axis, value)
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