Install PIP3 and PYTHON3.7 on Docker Ubuntu 18.04

Question

I have to install Python3.7 and pip3 for Python3.7 on my Docker Ubuntu18.04. I can install the 3.7, but I cannot get rid of pip3 for Python3.6:

FROM ubuntu:18.04
# ...
RUN apt-get update && apt-get install -y \
        software-properties-common
    RUN add-apt-repository ppa:deadsnakes/ppa
    RUN apt-get update && apt-get install -y \
        python3.7 \
        python3-pip
    RUN python3.7 -m pip install pip
    RUN apt-get update && apt-get install -y \
        python3-distutils \
        python3-setuptools

and I have

root@ef0c924ba7fa:/tornado_api# python3.7 --version
Python 3.7.3
root@ef0c924ba7fa:/tornado_api# pip3 --version
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)

while it should be pip3 under /usr/lib/python3.7/

Currently, I get

root@ef0c924ba7fa:/tornado_api# which pip3
/usr/bin/pip3
root@ef0c924ba7fa:/tornado_api# readlink $(which pip3)
root@ef0c924ba7fa:/tornado_api# 

Answer 1

It looks like this has gone stale, nevertheless, I was wondering whether by simply doing a python3.7 -m pip install --upgrade pip

FROM ubuntu:18.04
# ...
RUN apt-get update && apt-get install -y \
        software-properties-common
    RUN add-apt-repository ppa:deadsnakes/ppa
    RUN apt-get update && apt-get install -y \
        python3.7 \
        python3-pip
    RUN python3.7 -m pip install pip
    RUN apt-get update && apt-get install -y \
        python3-distutils \
        python3-setuptools
    RUN python3.7 -m pip install pip --upgrade pip

Answer 2

Try 'sudo apt purge pip3' or 'sudo apt-get purge pip3' If that does not work then try uninstalling pip3 with pip3. (I'm not that sure how)

My next thing to try is to update pip3 with 'pip3 install pip3' (I think)

If those don't work then I don't know.