upgrade python 3.6.7 to 3.9.0

Change-Id: I48402675e395f22028f3a942fd6aaf7a348f8cef

python3/Dockerfile

@@ -4,12 +4,12 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 MAINTAINER xt
 
 COPY sources.list /etc/apt/sources.list
-COPY Python-3.6.7.tar.xz ./python.tar.xz
-COPY Python-3.6.7.tar.xz.asc ./python.tar.xz.asc
+COPY Python-3.9.0.tar.xz ./python.tar.xz
+COPY Python-3.9.0.tar.xz.asc ./python.tar.xz.asc
 COPY get-pip.py ./get-pip.py
 
 # ensure local python is preferred over distribution python
@@ -43,7 +43,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 
 ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
-ENV PYTHON_VERSION 3.6.7
+ENV PYTHON_VERSION 3.9.0
 
 RUN set -ex \
 	\
@@ -85,7 +85,7 @@ RUN cd /usr/local/bin \
 	&& ln -s python3-config python-config
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 18.0
+ENV PYTHON_PIP_VERSION 20.2.3
 
 RUN set -ex; \
 	python get-pip.py \

python3/Python-3.6.7.tar.xz.asc

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python3/sources.list

-# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ bionic main restricted
-deb-src http://archive.ubuntu.com/ubuntu bionic main restricted #Added by software-properties
-deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted
-deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted multiverse universe #Added by software-properties
-deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted
-deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted multiverse universe #Added by software-properties
-deb http://mirrors.aliyun.com/ubuntu/ bionic universe
-deb http://mirrors.aliyun.com/ubuntu/ bionic-updates universe
-deb http://mirrors.aliyun.com/ubuntu/ bionic multiverse
-deb http://mirrors.aliyun.com/ubuntu/ bionic-updates multiverse
-deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
-deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse #Added by software-properties
-deb http://archive.canonical.com/ubuntu bionic partner
-deb-src http://archive.canonical.com/ubuntu bionic partner
-deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted
-deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted multiverse universe #Added by software-properties
-deb http://mirrors.aliyun.com/ubuntu/ bionic-security universe
-deb http://mirrors.aliyun.com/ubuntu/ bionic-security multiverse
+# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ focal main restricted
+deb-src http://archive.ubuntu.com/ubuntu focal main restricted #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ focal main restricted
+deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted multiverse universe #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted
+deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted multiverse universe #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ focal universe
+deb http://mirrors.aliyun.com/ubuntu/ focal-updates universe
+deb http://mirrors.aliyun.com/ubuntu/ focal multiverse
+deb http://mirrors.aliyun.com/ubuntu/ focal-updates multiverse
+deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse #Added by software-properties
+deb http://archive.canonical.com/ubuntu focal partner
+deb-src http://archive.canonical.com/ubuntu focal partner
+deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted
+deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted multiverse universe #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ focal-security universe
+deb http://mirrors.aliyun.com/ubuntu/ focal-security multiverse