This image is based on Alpine Linux image, which is only a 5MB image, and contains Python 3.5.
Total size of this image is only:
$ docker run --rm -it frolvlad/alpine-python3 python3 -c 'print("Hello World")'
Once you have run this command you will get printed 'Hello World' from Python!
NOTE: pip
/pip3
is also available in this image.