some other 3.6 documentation

Dockerfile

@@ -29,13 +29,7 @@ FROM $BASE_IMAGE
 # Install ETA
 #
 # Notes:
-#   ETA supports Python 2.7.X or Python 3.6.X
-#
-# `ppa:deadsnakes/ppa` is used in order to install Python 3.6 on Ubuntu 16.04
-# https://askubuntu.com/questions/865554/how-do-i-install-python-3-6-using-apt-get
-#
-# `https://bootstrap.pypa.io/get-pip.py` is used to install pip on Python 3.6
-# https://askubuntu.com/questions/889535/how-to-install-pip-for-python-3-6-on-ubuntu-16-10
+#   ETA supports Python 3.9+
 #
 # numpy==1.16.0 is enforced as a last step because tensorflow requires this
 # version to function properly, and some commands here seem to mess with the
@@ -58,8 +52,8 @@ RUN apt-get update \
         git \
         curl \
         wget \
-        python3.6 \
-        python3.6-dev \
+        python3.9 \
+        python3.9-dev \
         libcupti-dev \
         ffmpeg \
         imagemagick \

docs/virtualenv_guide.md

@@ -6,21 +6,14 @@ environment is highly recommended because it allows you to maintain a separate
 Python working environment for ETA that operates independently of other
 packages and Python applications on your machine.
 
-> Note that ETA does not currently support Python 3.7, so you must instead
-> have a Python 3.6 distribution installed on your machine
-
 > Note also that it is highly recommended that you do NOT use an Anaconda
 > Python distribution; if you do, the steps described here may fail... Fear
 > not, however, as ETA will install all necessary pacakges for you!
 
 
 ## Creating a virtual environment
 
-* If you want to create a Python 2.7 virtual environment and need a fresh
-Python installtion, download and install it from
-https://www.python.org/downloads
-
-* If you want to create a Python 3.6 virtual environment and need a fresh
+* If you want to create a Python 3.9 virtual environment and need a fresh
 Python installation, follow the steps below:
 
 ```shell
@@ -29,8 +22,8 @@ sudo apt-get update
 sudo apt-get -y --no-install-recommends install software-properties-common
 sudo add-apt-repository -y ppa:deadsnakes/ppa
 sudo apt-get update
-sudo apt-get -y --no-install-recommends install python3.6 python3.6-dev
-sudo ln -s /usr/bin/python3.6 /usr/local/bin/python
+sudo apt-get -y --no-install-recommends install python3.9 python3.9-dev
+sudo ln -s /usr/bin/python3.9 /usr/local/bin/python
 curl https://bootstrap.pypa.io/get-pip.py | sudo python
 sudo pip install --upgrade pip setuptools
 sudo pip install virtualenv
@@ -61,10 +54,7 @@ cd "${ENV_DIR}"
 * Make a virtual environment, modifying the python executable path as needed:
 
 ```shell
-# Example for Python 2.7
-virtualenv -p /usr/local/bin/python eta2
-
-# Example for Python 3.6
+# Example for Python 3.9
 virtualenv -p /usr/local/bin/python3 eta3
 ```
 
@@ -90,7 +80,7 @@ exit() {
 To install ETA in a virtual environment, simply activate the environment:
 
 ```shell
-# Example of activating a Python 3.6 environment created above
+# Example of activating a Python 3.9 environment created above
 eta3
 ```
 

install.bash

@@ -124,10 +124,10 @@ fi
 # Check Python version
 MSG "Checking version of 'python' binary"
 PYTHON_VERSION=$(python -c 'import platform; print(platform.python_version())')
-if [[ $PYTHON_VERSION == "3.6."* ]] || [[ $PYTHON_VERSION == "2.7."* ]]; then
+if [[ $PYTHON_VERSION == "3.9."* ]]; then
     MSG "Found compatible version: Python ${PYTHON_VERSION}"
 else
-    WARN "Python 3.6.X or 2.7.X are recommended, but Python $PYTHON_VERSION was found"
+    WARN "Python 3.9.X is recommended, but Python $PYTHON_VERSION was found"
     read -p "Are you sure you want to continue? [y/N] " -n 1 -r
     echo
     if [[ ! $REPLY =~ ^[Yy]$ ]]; then