docker compose - add python to LAMP - php

Question

In linux I build a blog application that is based on mysql, apache2 and php. But I use some python for it. The python is for adapting python Pygments that is described there https://davidwalsh.name/pygments-php-wordpress .
I prepared docker compose stage that works fine but python does not work in it. How to add python to docker compose?
Here are my files:
root#debian:/usr/local/share/a22php7m55# cat docker-compose.yml
version: "2.1"
services:
apachephp:
build: ./a22php7/
ports:
- 8888:80
volumes:
- "/etc/passwd:/etc/passwd:ro"
- "/etc/group:/etc/group:ro"
- "${PROJECT_ROOT}:/var/www/html"
networks:
- database
- server
depends_on:
- mysql
container_name: ap47
mysql:
image: mariadb:5.5
volumes:
- ${MYSQL_DATA}:/var/lib/mysql
networks:
- database
environment:
MYSQL_ROOT_PASSWORD: "${MYSQL_ROOT_PASSWORD}"
MYSQL_DATABASE: "${MYSQL_NAME}"
MYSQL_USER: "${MYSQL_USERNAME}"
MYSQL_PASSWORD: "${MYSQL_PASSWORD}"
container_name: maria47
phpmyadmin:
image: phpmyadmin/phpmyadmin
ports:
- 8080:80
networks:
- database
depends_on:
- mysql
environment:
PMA_HOST: mysql
container_name: pma47
volumes:
mariadb:
networks:
database:
server:
root#debian:/usr/local/share/a22php7m55# cat a22php7/
root#debian:/usr/local/share/a22php7m55# cat a22php7/Dockerfile
FROM php:7.1.3-apache
RUN docker-php-ext-install pdo pdo_mysql
root#debian:/usr/local/share/a22php7m55#

Answer 1

Looking at the base image for php:7.1.3-apache we see it's built on debian:jessie so we can install python, pip and pygments by adding these lines to your Dockerfile:
RUN apt-get update && apt-get install -y python python-pip
RUN pip install pygments