An example to illustrate basic Dockerization

Dockerfile

FROM       python
MAINTAINER Sawood Alam <@ibnesayeed>

RUN        pip install beautifulsoup4
RUN        pip install requests
ADD        main.py /app/
WORKDIR    /app
RUN        chmod a+x main.py
ENTRYPOINT ["./main.py"]

main.py

#!/usr/bin/env python

import sys
import requests
from bs4 import BeautifulSoup

r = requests.get(sys.argv[-1])
data = r.text
soup = BeautifulSoup(data)
for link in soup.find_all("a"):
    print(link.get("href"))