dockerfile = """
FROM python:{py_version}
MAINTAINER {maintainer}
WORKDIR /app
RUN pip install {requirements}
ENV PY_LIB "{app_content | encode_base64}"
RUN python -c "import os,base64;b=os.getenv('PY_LIB');b=base64.b64decode(b);print(b.decode('utf-8'))" | tee app.py
CMD python app.py
"""