Python2-and-Python3-in-Docker

Creates a single Docker container lets you run both Python 2.7.13 and Python 3.7.1

TL;DR:$ docker build -t python-2-and-3 .

Starts withpython:3.7.1-alpineand then installs most ofpython:2.7.13-alpineon top to allow you to choose either Python version at runtime via: python2, python3, pip2, pip3

NOTE: site-packages are separate sopip2 install pkgnamedoes not makepkgnameavailable to Python 3. This means that you would also need topip3 install pkgnameto makepkgnameaccessable from both versions of Python.

$ mkdir python-2-and-3
$ cd python-2-and-3

# <put `Dockerfile` into that directory...>
$ docker build -t python-2-and-3 .
$ docker images  # python-2-and-3 should be at the top of the list

# Do some optional interactive testing...
$ docker run -it python-2-and-3 /bin/sh
\# python  -V  # Python 2.7.13
\# python2 -V  # Python 2.7.13
\# python3 -V  # Python 3.6.0

\# pip  -V     # pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)
\# pip2 -V     # pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)
\# pip3 -V     # pip 9.0.1 from /usr/local/lib/python3.6/site-packages (python 3.6)

\# SCRIPT="import platform ; print(platform.python_version())"
\# python  -c "$SCRIPT"  # 2.7.13
\# python2 -c "$SCRIPT"  # 2.7.13
\# python3 -c "$SCRIPT"  # 3.6.0

\# exit
$

pip3 install failed with error code 1

Seems like the python3 'print' syntax was not followed properly, but not sure why.

/ # pip3 --no-cache-dir -v install BeautifulSoup
Collecting BeautifulSoup
1 location(s) to search for versions of BeautifulSoup:

https://pypi.python.org/simple/beautifulsoup/
Getting page https://pypi.python.org/simple/beautifulsoup/
Starting new HTTPS connection (1): pypi.python.org
"GET /simple/beautifulsoup/ HTTP/1.1" 200 316
Analyzing links from page https://pypi.python.org/simple/beautifulsoup/
Found link https://pypi.python.org/packages/1e/ee/295988deca1a5a7accd783d0dfe14524867e31abb05b6c0eeceee49c759d/BeautifulSoup-3.2.1.tar.gz#md5=44656527ef3ac9874ac4d1c9f35f70ee (from https://pypi.python.org/simple/beautifulsoup/), version: 3.2.1
Found link https://pypi.python.org/packages/33/fe/15326560884f20d792d3ffc7fe8f639aab88647c9d46509a240d9bfbb6b1/BeautifulSoup-3.2.0.tar.gz#md5=9c0f5d246ecfcf5f0905a47b1466e140 (from https://pypi.python.org/simple/beautifulsoup/), version: 3.2.0
Using version 3.2.1 (newest of versions: 3.2.0, 3.2.1)
"GET /packages/1e/ee/295988deca1a5a7accd783d0dfe14524867e31abb05b6c0eeceee49c759d/BeautifulSoup-3.2.1.tar.gz HTTP/1.1" 200 31220
Downloading BeautifulSoup-3.2.1.tar.gz
Downloading from URL https://pypi.python.org/packages/1e/ee/295988deca1a5a7accd783d0dfe14524867e31abb05b6c0eeceee49c759d/BeautifulSoup-3.2.1.tar.gz#md5=44656527ef3ac9874ac4d1c9f35f70ee (from https://pypi.python.org/simple/beautifulsoup/)
Running setup.py (path:/tmp/pip-build-l5yv0wg8/BeautifulSoup/setup.py) egg_info for package BeautifulSoup
Running command python setup.py egg_info
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-build-l5yv0wg8/BeautifulSoup/setup.py", line 22
print "Unit tests have failed!"
^
SyntaxError: Missing parentheses in call to 'print'
Cleaning up...
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-l5yv0wg8/BeautifulSoup/
Exception information:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/local/lib/python3.6/site-packages/pip/commands/install.py", line 324, in run
requirement_set.prepare_files(finder)
File "/usr/local/lib/python3.6/site-packages/pip/req/req_set.py", line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/usr/local/lib/python3.6/site-packages/pip/req/req_set.py", line 634, in _prepare_file
abstract_dist.prep_for_dist()
File "/usr/local/lib/python3.6/site-packages/pip/req/req_set.py", line 129, in prep_for_dist
self.req_to_install.run_egg_info()
File "/usr/local/lib/python3.6/site-packages/pip/req/req_install.py", line 439, in run_egg_info
command_desc='python setup.py egg_info')
File "/usr/local/lib/python3.6/site-packages/pip/utils/init.py", line 707, in call_subprocess
% (command_desc, proc.returncode, cwd))
pip.exceptions.InstallationError: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-l5yv0wg8/BeautifulSoup/

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