package 中的 Python 疯狂模块导入

Question

I'm inside a python package where there is A.py, B.py and an init file that allows me to import packages into the directory above.

Thus, the content of my init file is as follows:

__path__ = __import__('pkgutil').extend_path(__path__, __name__)

I now want to import a class of B.py into A.py. I tried to use from B import myClass but it doesn't work. I also tried to add the file in the path by adding this line to the init file:

__path__.append(__file__)

How to add B.py to the path?

--edit--

To clarify things, here is the structure of my packages and modules:

|app.py 
|package1
    |__init__.py
    |C.py
    |package2
        |__init__.py
        |A.py
        |B.py

In A.py I need to import classes from B.py and C.py

Answer 1

If this is python 3 related code...then really there's no need for an __init__.py anymore.

As long as your files that you want to import classes/functions from are within the same directory you should be able to just call in the file you want to do the import as this:

 import B.myClass

or,

 from . import myClass
 ### this imports all the classes and moduels from within the same directory 
 ### as you're currently in even if it has more than one file (but only imports myClass)