title: passing file as argument to docker run
body: <p>I have a python3 command line script that uses argparse to read the arguments and give the results. It works fine when I run from terminal as:</p>
  <pre><code>my_cli --input input.csv --output output.csv --number 8
  </code></pre>
  <hr />
  <p>I dockerized it successfully and trying to run as:</p>
  <pre><code>docker run --mount type=bind,source=/tmp/path,target=/app my_cli_container --input input.csv --output output.csv --number 8
  </code></pre>
  <p>I get:
  <strong>FileNotFoundError: [Errno 2] No such file or directory:input.csv</strong></p>
  <p>What I am doing wrong here ?
  Why is the container not able to see the input file ?
  Do I have to do something extra to read this input file and number, and then write output to a file ?</p>
  <p>Thank you.</p>