How do I execute a systemctl command to start clamav from a Python script from inside a docker container.

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Description: I have a simple Python script that tries to check whether ClamAV is "inactive" in the container and if it is then it attempts to start it using 
    <pre lang="Python">import os 
        os.popen("systemctl start clamav-freshclam.service")
        os.popen("systemctl start clamav-daemon")

However this always results in a

FileNotFoundError: systemctl clamav-daemon file not found.

Here's the tricky part - When I start a Python console inside the container and write this same code, it ends up starting the service - both the freshclam and daemon. What am I missing here?

What I have tried:

I have written the script and tried to execute the command which works from the container python shell, with no luck.