cython，隐藏或删除对已编译pyd中内部加载模块的访问

Question

我有一个像下面这样收集的模块，并生成一个.pyd文件 但是当导入它时，所有内部加载的模块将由用户通过简单的python biltin dir（）可见。那么有没有办法将它们隐藏起来？

#et.pxd file results in et.pyd

    include "etfile.py"
    include "et_reader.py"
    include "et_reader_preferences.py"
    include "et_reader_properties.py"
    include "et_reader_objects.py"
    include "et_writer.py"

测试文件：

>>> import et
>>> print dir(et)
it will print a list of all internal loaded modules, functions and ...