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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def is_safe(self):
 """ Return ``True`` if the container can be safely extracted, that is, if all its entries are safe, ``False`` otherwise. :rtype: bool :raises: same as :func:`~aeneas.container.Container.entries` """

        self.log(u"Checking if this container is safe")
        for entry in self.entries:
            if not self.is_entry_safe(entry):
                self.log([u"This container is not safe: found unsafe entry '%s'", entry])
                return False
        self.log(u"This container is safe")
        return True