Question

as the title says, I am confused about sub-subpackages. My package structure is the following:

draw \
    __init__.py

    base \
        __init__.py
        utils.py
        events.py
        master.py
        basegui.py

Now, the first line of draw.base.events is the following:

import draw.base.utils as _utils

And the first line of draw.base is:

from draw.base.events import Event, RenderEvent, InputEvent, MouseEvent, KeyboardEvent

Just checking the code for SyntaxErrors with IDLE:

import draw.base as base

gives the following AttributeError:

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    import draw.base
  File "Z:\Eigene Dateien\Eigene Dokumente\Python\draw\base\__init__.py", line 4, in <module>
    import draw.base.events as events
  File "Z:\Eigene Dateien\Eigene Dokumente\Python\draw\base\events.py", line 10, in <module>
    import draw.base.utils  as _utils
AttributeError: 'module' object has no attribute 'base'

Can someone explain to me whats the issue ?

Answer 1

In order to import draw.base.utils in draw.base.events Python needs to import draw.base which is being imported now so there is no draw.base yet. You can replace import draw.base.utils with import utils (you can also use something like from ..base import utils in 2.7, 3.x or with from __future__ import absolute_import) in draw.base.events to break the circle.