Is there a way to copy the file contents from a different containers to host file system?

I’m trying to copy the text file from a docker container to a host file system. We can do this using the docker cp command but the real issue is : There is a possibility that there might be a different container of the same image because my virtual machine will restart after sometime. And there will be a different container id for the same image when I restart my machine.
I have to include this commands in the python script and so I can not change the container ID explicitly.

I have tried the docker cp command in which we have to mention the container id.

def function():
    write some data into the file.
    I need to execute commands or bash script here so that file I have 
    created in the container can be copied to host file system given 
    container id will change because of the machine restart. 

Source: StackOverflow