title: How to copy a file from host to container using docker-py (docker SDK)
body: <p>I know, there is possible way how to copy file bidirectionally between host and docker container using <code>docker cp</code> and also it is possible to obtain file from running container using docker-py. But I am not able to figure out how (or if it is even possible) copy file from host to running container using docker-py. 
  Do you guys have any experiences with such kind of problem? Is it possible to do or I have to execute command using python <code>os.system</code>. I would like to avoid this solution.</p>