a rookie problem about 'Modules'

hi,i'm a freshman for python. i got a problem about "Modules"
this is my dir
A/
a.py
__init__.py
B/
__init__.py
b.py
C/
__init__.py
c.py

and i wrote this as follows in c.py

from A.B import b
~~~~blablabla

but the compiler warned like this:

Traceback (most recent call last):
File "H:\workspace\A\B\b.py", line 1, in <module>
from A.C import c
ImportError: No module named A.C

so what's the matter ? should i do sth in sys.path or
someelse?

i hope sb can help me with it thanks

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