gistfile1.hpp

from traceback import print_exc

class debug_property(object):
    '''
    Doesn't squash AttributeError.
    '''

    def __init__(self, fget=None, fset=None, fdel=None, doc=None):
        self.__get = fget
        self.__set = fset
        self.__del = fdel
        self.__doc__ = doc

    def __get__(self, inst, type=None):
        if inst is None:
            return self
        if self.__get is None:
            raise AttributeError, "unreadable attribute"
        try:
            return self.__get(inst)
        except AttributeError, e:
            # don't allow attribute errors to be squashed
            print_exc()
            raise AssertionError('attribute error during __get__')

    def __set__(self, inst, value):
        if self.__set is None:
            raise AttributeError, "can't set attribute"

        try:
            return self.__set(inst, value)
        except AttributeError, e:
            print_exc()
            raise AssertionError('attribute error during __set__')

    def __delete__(self, inst):
        if self.__del is None:
            raise AttributeError, "can't delete attribute"

        try:
            return self.__del(inst)
        except AttributeError, e:
            print_exc()
            raise AssertionError('attribute error during __del__')