• occasionally python As scaffolding , It is necessary to

• Replace source first

• Then load ppa

• Then specify the version number

Reference resources , It's like this 3.6

FROM ubuntu:18.04
RUN apt-get update && apt-get install -y software-properties-common gcc && \
add-apt-repository -y ppa:deadsnakes/ppa
RUN apt-get update && apt-get install -y python3.6 python3-d