[Python] ModuleNotFoundError: No module named 'x' where x is a module suppose to be a shared...

I have a project with three modules - one, two and three. one and two are stand-alone services and three is the common lib that will be used by one and two. When I tried to run docker-compose up --build at the root folder, both the module one and two containers failed to start with error log

ModuleNotFoundError: No module named 'three'


Below is the structure

/root-folder
│
├── one
│ ├── Dockerfile
│ ├── requirements.txt
│ ├── __init__.py
│ └── main.py
│
├── two
│ ├── Dockerfile
│ ├── requirements.txt
│ ├── __init__.py
│ └── main.py
│
├── three
│ ├── Dockerfile
│ ├── requirements.txt
│ ├── __init__.py
│ └── setup.py
│
└── docker-compose.yaml


The docker-compose.yaml file is as below

version: '3.8'

services:
one:
container_name: container-one
build:
context: .
dockerfile: ./one/Dockerfile
image: one:latest
ports:
- "8881:8881"
environment:
- ENVIRONMENT=development

two:
container_name: container-two
build:
context: .
dockerfile: ./two/Dockerfile
image: two:latest
ports:
- "8882:8882"
environment:
- ENVIRONMENT=development


And Dockerfile for one and two are

FROM python:3.12-slim AS builder

WORKDIR /build

COPY /one/requirements.txt /build/ # ("COPY /two/requirements.txt /build/" for Dockerfile of module two)

RUN python -m venv /opt/venv \
&& /opt/venv/bin/pip install --upgrade pip setuptools wheel \
&& /opt/venv/bin/pip install -r requirements.txt

FROM python:3.12-slim

WORKDIR /app

COPY --from=builder /opt/venv /opt/venv

ENV PATH="/opt/venv/bin:$PATH"

COPY /one /app # ("COPY /two /app" for Dockerfile of module two)
COPY /three /three

RUN pip install /three && pip install -r requirements.txt

CMD ["python", "main.py"]


For three is

FROM python:3.12-slim AS builder

WORKDIR /build

COPY requirements.txt /build/

RUN python -m venv /opt/venv \
&& /opt/venv/bin/pip install --upgrade pip setuptools wheel \
&& /opt/venv/bin/pip install -r requirements.txt

FROM python:3.12-slim

WORKDIR /app

COPY --from=builder /opt/venv /opt/venv

ENV PATH="/opt/venv/bin:$PATH"

COPY . .

RUN pip install -e .


and the setup.py for module three is

from setuptools import setup, find_packages

setup(
name='three',
version='0.1',
packages=find_packages(include=['*']),
install_requires=[
'avro-python3==1.10.2',
],
zip_safe=False,
)


Please help.

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