Manage KVM VMs with Python like VBoxmanagement

Question

I have a VM which run under KVM, and I want to manage them with Python to do some functions like

1. Send a file to the guest VM
2. Execute a process or program in the guest VM
3. Dump a memory file used by the guest VM

How do I do that?

P.S.: I tried Libvirt, but I can't find functions to do the above ...