The prefix run inside the context of the environment

        :return: The python prefix inside the environment
        :rtype: :data:`sys.prefix`

def sys_prefix(self):
        """
        The prefix run inside the context of the environment

        :return: The python prefix inside the environment
        :rtype: :data:`sys.prefix`
        """

        command = [self.python, "-c" "import sys; print(sys.prefix)"]
        c = vistir.misc.run(command, return_object=True, block=True, nospin=True, write_to_stdout=False)
        sys_prefix = vistir.compat.Path(vistir.misc.to_text(c.out).strip()).as_posix()
        return sys_prefix