AttributeError: module 'lyrics' has no attribute 'Domain' - python

I am having troubles with making my code running in Python3 (it was in Python2 and I am converting it).
Here is the project structure:
lyrics/__init__.py
lyrics/lyrics.py
./manifold.py
in manifold.py :
import lyrics as lyr
lyr.Domain(label="Points", data=X)
where Domain class is defined in lyrics/lyrics.py:
class Domain(object):
...
When I execute manifold.py with:
./manifold.py
I get this error:
Traceback (most recent call last): File "./manifold.py", line 76, in
Points = lyr.Domain(label="Points", data=X) AttributeError: module 'lyrics' has no attribute 'Domain'
Any idea ?
Thank you
[EDIT]
in lyrics/init.py
from lyrics import *
from . import functions

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