@@ -7,7 +7,7 @@ WORKDIR /root
 
 SHELL [ "/bin/bash", "-c" ]
 
-ARG PYTHON_VERSION_TAG=3.8.0
+ARG PYTHON_VERSION_TAG=3.8.1
 ARG LINK_PYTHON_TO_PYTHON3=1
 
 # Existing lsb_release causes issues with modern installations of Python3

@@ -1,8 +1,17 @@
 default: image
 
-all: image py_3.6.8 py_3.7.4
+all: image py_3.8.0 py_3.7.4 py_3.6.8
 
 image:
+docker build -f Dockerfile \
+--cache-from matthewfeickert/docker-python3-ubuntu:latest \
+--build-arg PYTHON_VERSION_TAG=3.8.1 \
+--build-arg LINK_PYTHON_TO_PYTHON3=1 \
+-t matthewfeickert/docker-python3-ubuntu:latest \
+-t matthewfeickert/docker-python3-ubuntu:3.8.1 \
+--compress .
+
+py_3.8.0:
 docker build -f Dockerfile \
 --cache-from matthewfeickert/docker-python3-ubuntu:latest \
 --build-arg PYTHON_VERSION_TAG=3.8.0 \

@@ -1,6 +1,6 @@
 # Python3 on Ubuntu Docker
 
-Dockerfile for image built off [Ubuntu 18.04](https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes/18.04) containing [Python 3.8](https://www.python.org/downloads/release/python-380/) ([Python 3.6](https://www.python.org/downloads/release/python-368/), [Python 3.7](https://www.python.org/downloads/release/python-374/)) built from source
+Dockerfile for image built off [Ubuntu 18.04](https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes/18.04) containing [Python 3.8](https://www.python.org/downloads/release/python-381/) ([Python 3.6](https://www.python.org/downloads/release/python-368/), [Python 3.7](https://www.python.org/downloads/release/python-374/)) built from source
 
 [![Docker Automated build](https://img.shields.io/docker/automated/matthewfeickert/docker-python3-ubuntu.svg)](https://hub.docker.com/r/matthewfeickert/docker-python3-ubuntu/)
 [![Docker Build Status](https://img.shields.io/docker/build/matthewfeickert/docker-python3-ubuntu.svg)](https://hub.docker.com/r/matthewfeickert/docker-python3-ubuntu/builds/)

@@ -15,7 +15,7 @@ function download_cpython () {
 function set_num_processors {
 # Set the number of processors used for build
 # to be 1 less than are available
-if [[ -f "$(which nproc)" ]]; then
+if [[ -f "$(command -v nproc)" ]]; then
 NPROC="$(nproc)"
 else
 NPROC="$(grep -c '^processor' /proc/cpuinfo)"
@@ -74,16 +74,16 @@ function symlink_python_to_python3 {
 local python_version
 python_version="$(python3 --version)"
 local which_python
-which_python="$(which python3)${python_version:8:-2}"
+which_python="$(command -v python3)${python_version:8:-2}"
 local which_pip
-which_pip="$(which pip3)"
+which_pip="$(command -v pip3)"
 
 # symlink python to python3
 printf "\n### ln -s -f %s %s\n" "${which_python}" "${which_python::-3}"
 ln -s -f "${which_python}" "${which_python::-3}"
 
 # symlink pip to pip3 if no pip exists or it is a different version than pip3
-if [[ ! -z "$(which pip)" ]]; then
+if [[ -n "$(command -v pip)" ]]; then
 if [[ "$(pip --version)" = "$(pip3 --version)" ]]; then
 return 0
 fi
@@ -97,7 +97,7 @@ function main() {
 # 1: the Python version tag
 # 2: bool of if should symlink python and pip to python3 versions
 
-PYTHON_VERSION_TAG=3.8.0
+PYTHON_VERSION_TAG=3.8.1
 LINK_PYTHON_TO_PYTHON3=0 # By default don't link so as to reserve python for Python 2
 if [[ $# -gt 0 ]]; then
 PYTHON_VERSION_TAG="${1}"