导入模块反之亦然

Question

In MicroPython I created two modules 'mod_a' and 'mod_b'. I am trying to grab functionality from one to the other and the other way around.

|mod_a
|  | foo.py
|  | __init__.py
|mod b
|  | baa.py
|  | __init__.py

foo.py

# necessary to grab module mod_b
import sys
sys.path.append('.')

from mod_b import Baa

class Foo:
    b = Baa()
    b.printer()
    
    def drinker(self):
        print('Drinking')

baa.py

import sys

# not working
# from mod_a import Foo

class Baa:
    
    def printer(self):
        print('Printer')
        print('b.Baa', sys.path)  => ['.' ...]

        # ==> how to get this working
        # a = Foo()
        # a.drinker()

So far I tried

import sys
import os

if '/' not in sys.path:
    sys.path.insert(0, os.getcwd())
    sys.path.insert(1, '.')
    sys.path.insert(2, '/mod_b')
    sys.path.insert(2, '/mod_a')
    sys.path.insert(2, '.mod_b')
    sys.path.insert(2, '.mod_a')

and

sys.modules.get('.mod_b')

Answer 1

Please note that the following code only solves the import problem. The code still has a circular import problem.

ImportError: cannot import name 'Baa' from partially initialized module 'mod_b.baa' (most likely due to a circular import) (C:\Users\Guest\test\.\mod_b\baa.py)

When initializing class Foo, it needs to call Baa.printer() which calls a = Foo() need the uninitialized class Foo, you need to fix that later.

foo.py

import sys
sys.path.insert(0,'.')
from mod_b.baa import Baa

class Foo:
    b = Baa()
    b.printer()
    
    def drinker(self):
        print('Drinking')

baa.py

import sys
sys.path.insert(0,'.')
from mod_a.foo import Foo

class Baa:
    def printer(self):
        print('Printer')
        a = Foo()
        a.drinker()

Answer 2

Circular imports are not supported in MicroPython up to v1.18. MicroPython is largely based on Python 3.4 and differences to Python 3.5 are documented including circular imports.