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I need help using ctypes on jython

I want to use libxmp.
I used:
import sys
sys.path.append('/usr/local/lib/python3.8/dist-packages')
which directly locate to libxmp
from libxmp import XMPFiles, consts
from libxmp.utils import file_to_dict
upper code box is the import part
I faced this problem:
Traceback (most recent call last):
File "/home/webprime/jython/jython/jython.py", line 5, in <module>
from libxmp import XMPFiles, consts
File "/usr/local/lib/python3.8/dist-packages/libxmp/__init__.py", line 37, in <module>
from ctypes import util
ImportError: cannot import name util
it works on Python 3.

python 2.7 will not import despite adding to path

Riddle me this..
importing package disaster..why?
contents of yenlib:
/var/yenlib
- __init__.py
- yenlib
- __init__.py
- json_.py
import sys
sys.path.append('/var/yenlib')
sys.path.append('/var/yenlib/yenlib')
from yenlib import json_ as json
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: cannot import name json_

Skip the second "append" statement and import from yenlib.yenlib
import sys
sys.path.append("/var/yenlib")
from yenlib.yenlib import json_ as json

Unbable to import function

I have tried following
when I tried to import the class from the file named plyparser.py of pycparser(https://github.com/eliben/pycparser/blob/master/pycparser/plyparser.py)
using the following statement
from pycparser.plyparser import Coord
But, I am unable to import function parameterized from plyparser of pycparser using the following statement
from pycparser.plyparser import parameterized
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: cannot import name parameterized
How to resolve this issue.

Importing module item of subpackage from another subpackage

I have this project structure:
root_package/
root_package/packA/
root_package/packA/__init__.py (empty)
root_package/packA/moduleA.py
root_package/packB/__init__.py (empty)
root_package/packB/moduleB.py
root_package/rootModule.py
In the rootModule.py I have from packA.moduleA import ModuleAClass.
At the packA.moduleA.py I have this from root_package.packB.moduleB import ModuleBItem.
When running rootModule either via PyCharm or the terminal with python ./rootModule.py I am getting this error:
Was this the right way of importing?
Traceback (most recent call last):
File "/project_dir/rootPackage/rootModule.py", line 7, in <module>
from packA.moduleA import ModuleAClass
File "/project_dir/rootPackage/packA/moduleA.py", line 8, in <module>
from rootPackage.packB.moduleB import module_b_method
File "/project_dir/rootPackage/rootModule.py", line 7, in <module>
from packA.wavelet_compression import WaveletCompression
ImportError: cannot import name WaveletCompression
How to solve this?
Update 1
I've added a test file at the project_folder (not the root_package folder).
So the current directory structure is this:
project_folder/
project_folder/root_package/
project_folder/root_package/packA/
project_folder/root_package/packA/__init__.py (empty)
project_folder/root_package/packA/moduleA.py
project_folder/root_package/packB/__init__.py (empty)
project_folder/root_package/packB/moduleB.py
project_folder/root_package/rootModule.py
project_folder/test_rootModule.py
I haven't made the project_folder a package (no __init__.py file) since, the test_rootModule is simply a script to help me run the experiments.
So, in root_package/packA/moduleA.py, after changing the from root_package.packB.moduleB import ModuleBitem, to from packB.moduleB import ModuleBitem, as the answer suggests, it works.
But now there are two problems:
1. PyCharm doesn't agree with the change:
I cannot run my experiments from the project_folder/test_rootModule.py script.
I got this error:
Traceback (most recent call last):
File "project_folder/test_rootModule.py", line 8, in
from root_package.rootModule import rootModuleClass
File "project_folder/root_package/rootModule.py", line 7, in
from packA.moduleA import ModuleAClass
File "project_folder/root_package/packA/moduleA.py", line 8, in
from packB.moduleB import module_b_item
ImportError: No module named packB.moduleB
I cannot seem to get the 2nd Traceback to look like a code segment.
Update 2
What solved the problem was going to the Project: project_name > Project Structure dialog in PyCharm, selecting the root_package and then setting it as a Sources folder.
Now, I can run via the IDE both the rootModule and the test_rootModule.
Although, I cannot get to run the test_rootModule from the terminal.
The test_rootModule has these imports:
from root_package.rootModule import RootModuleClass
from root_package.packB.moduleB import module_b_item
I am at the project_folder dir, and run python ./test_rootModule.py and get this error:
Traceback (most recent call last):
File "./test_rootModule.py", line 8, in <module>
from root_package.rootModule import RootModuleClass
File "project_folder/root_package/rootModule.py", line 7, in <module>
from packA.moduleA import ModuleAClass
File "project_folder/root_package/packA/moduleA.py", line 8, in <module>
from packB.moduleB import module_b_item
ImportError: No module named packB.moduleB

If you are running all your code from within this path:
project_folder
Then you should ensure that all your modules that reside in root_package are referenced by that first. So for example:
from root_package.modA import foo

ImportError: cannot import name

For some reason I receive an ImportError every time I try to import a class from another file. Here's the github page for my project: https://github.com/wheelebin/mcnextbot
Here's the error that I'm receiving:
Traceback (most recent call last):
File "ircbot.py", line 36, in <module>
from test import mcnextlvl
ImportError: cannot import name mcnextlvl

Here your from test import something refers to the module test in <PYTHONPATH>/lib, not yourselves test.py, and there is no submodule/class mcnextlvl there. You should use from lib.test import mcnextlvl as #sgmart commented.

The __init__.py python file allow you can import your individual modules named 'test' from the lib package.