Update Dockerfile to use Python 3.9 (#334)

* Update Dockerfile and add compose file.

* Update Dockerfile comment.

* Updated README.

---------

Co-authored-by: Connor <>
Co-authored-by: Jessica Tegner <jessica.tegner@outlook.com>

Dockerfile

@@ -1,21 +1,26 @@
 # --------------------------------------------------------------------------
-# This is a Dockerfile to build an Ubuntu 14.04 Docker image with pypandoc
-# and pandoc
+# This is a Dockerfile to build an Debian 11 (bullseye) image with pypandoc
+# and pandoc, uses Python 3.9.
 #
 # Use a command like:
 #     docker build -t <user>/pypandoc .
 # --------------------------------------------------------------------------
 
-FROM  orchardup/python:2.7
-MAINTAINER  Marc Abramowitz <marc@marc-abramowitz.com> (@msabramo)
+# Use Python 3.9
+FROM  python:3.9
+# Not sure if this line needs updating, I think this person no longer works on the project?
+LABEL author  Marc Abramowitz <marc@marc-abramowitz.com>
+# Update apt packages and install pandoc
+RUN apt update && apt upgrade -y && apt install pandoc -y
+# Update pip
+RUN pip install --upgrade pip
 
-ENV DEBIAN_FRONTEND noninteractive
-ENV LC_ALL C
-
-RUN apt-get update && apt-get install -y pandoc ipython
-ADD . pypandoc
+# Copy the files to container   
+COPY . pypandoc
 WORKDIR pypandoc
-RUN python setup.py install
+
+# Use pip to install the local version of pypandoc using pyproject.toml
+RUN pip install .
 
 RUN mkdir -p /source
 WORKDIR /source

README.md

@@ -311,7 +311,7 @@ Note that for citeproc tests to pass you'll need to have [pandoc-citeproc](https
 * [Jesse Widner](https://github.com/jwidner) & [Dominic Thorn](https://github.com/domvwt) - Add support for lua filters
 * [Alex Kneisel](https://github.com/hey-thanks/) - Added pathlib.Path support to convert_file.
 * [Juho Vepsäläinen](https://github.com/bebraw/) - Creator and former maintainer of pypandoc
-
+* [Connor](https://github.com/DisSupEng/) - Updated Dockerfile to Python 3.9 image and added docker compose file
 
 ## License
 

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  app:
+    image: pypandoc
+    container_name: pypan_container
+    build: .
+    restart: always
+    volumes:
+    # Create a binding mount between the source directory on the host and the container's source code directory.
+    # This means that any updated code will be transfered to the running container
+    - .:/pypandoc/
+    # This is just to keep the container running. It will allow us to use docker compose exec to go inside the container.
+    command: tail -F ./anything