ModuleNotFoundError: No module named 'hello' when called from Dockerfile - python-3.x

Question

I am trying to read the module hello.py from Dockerfile and seeing the below error:
ModuleNotFoundError: No module named 'hello'
I have tried changing the directory to the current working directory where hello.py is present, but that still doesn't help.
The tree structure as below with hello.py and Dockerfile at the same location:
├── Dockerfile
├── hello.py
├── __init__.py
├── Procfile
├── README.txt
├── requirements.txt
Dockerfile content:
FROM python:3.6.7
RUN pip install gunicorn
EXPOSE 5000
CMD PYTHONPATH=`pwd`/.. gunicorn --bind 0.0.0.0:5000 hello:app
Output when running the container
-----> docker run -p 5000:5000 <image_name>
[2019-06-29 05:03:02 +0000] [7] [INFO] Starting gunicorn 19.9.0
[2019-06-29 05:03:02 +0000] [7] [INFO] Listening at: http://0.0.0.0:5000 (7)
[2019-06-29 05:03:02 +0000] [7] [INFO] Using worker: sync
[2019-06-29 05:03:02 +0000] [10] [INFO] Booting worker with pid: 10
[2019-06-29 05:03:02 +0000] [10] [ERROR] Exception in worker process
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
worker.init_process()
File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 129, in init_process
self.load_wsgi()
File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
self.wsgi = self.app.wsgi()
File "/usr/local/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
self.callable = self.load()
File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
return self.load_wsgiapp()
File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
return util.import_app(self.app_uri)
File "/usr/local/lib/python3.6/site-packages/gunicorn/util.py", line 350, in import_app
__import__(module)
ModuleNotFoundError: No module named 'hello'
[2019-06-29 05:03:02 +0000] [10] [INFO] Worker exiting (pid: 10)
[2019-06-29 05:03:02 +0000] [7] [INFO] Shutting down: Master
[2019-06-29 05:03:02 +0000] [7] [INFO] Reason: Worker failed to boot.
What am i missing the Dockerfile?

Answer 1

you are missing the COPY line:
FROM python:3.6.7
RUN pip install gunicorn
COPY . . #copy everything in the context to the current dir in the container
EXPOSE 5000
CMD PYTHONPATH=`pwd`/.. gunicorn --bind 0.0.0.0:5000 hello:app
otherwise the container would not include your files