title: Dockerfile error: /bin/sh: 1: [“python”,: not found
body: <p>here is my Dockerfile tried to build:</p>
  
  <pre><code>FROM ubuntu:latest
  
  # install flask server
  RUN apt-get update -y
  RUN apt-get install -y python-pip python-dev build-essential
  COPY app.py /
  RUN pip install flask
  
  # install ruby
  RUN \
    apt-get install -y ruby ruby-dev ruby-bundler &amp;&amp; \
    rm -rf /var/lib/apt/lists/*
  
  # install lua
  RUN apt-get update -y &amp;&amp; apt-get install -y luajit luarocks
  
  # Define default command.
  CMD [“python”, “app.py”]
  </code></pre>
  
  <p>However, it shown up with error
      /bin/sh: 1: [“python”,: not found</p>
  
  <p>I have no idea why this happened. Could someone please help me with it?</p>